26 Feb
2009
26 Feb
'09
5:20 p.m.
Hi there,
Sorry about my previous mail. I was just starting to write a draft
about the topics I want to ask, and I accidentally push the send
button.
Well, my goal is to play two midi keyboards, sending the events
through jackd, to qsynth. My computer is a Laptop HP 550, with HDA
Intel sound card, 3 GB of memory, and a Core 2 DUO CPU of 1.40 GHz. My
OS is UbuntuStudio 8.04, with kernel 2.6.24-23-rt.
First of all, I cannot run jackd without xruns, if I configure it with
32 frames per period, or less. I am running it as root, with realtime,
and a priority of 70. As soon as I run it, it starts to count xruns,
and I am only executing jackd.
Looking at the different IRQ, I have saw that my sound card is sharing
the IRQ 16 with an USB port, and the video driver. This is a cat of
/proc/interrupts:
CPU0 CPU1
0: 1026591 1099066 IO-APIC-edge timer
1: 2060 839 IO-APIC-edge i8042
8: 0 1 IO-APIC-edge rtc
9: 121 95 IO-APIC-fasteoi acpi
12: 118454 56308 IO-APIC-edge i8042
14: 6410 5638 IO-APIC-edge libata
15: 5167 6228 IO-APIC-edge libata
16: 624 482 IO-APIC-fasteoi uhci_hcd:usb1, HDA
Intel, i915@pci:0000:00:02.0
17: 24009 14458 IO-APIC-fasteoi eth1
18: 0 0 IO-APIC-fasteoi ehci_hcd:usb2, uhci_hcd:usb5
20: 0 0 IO-APIC-fasteoi uhci_hcd:usb3, ehci_hcd:usb6
21: 0 0 IO-APIC-fasteoi uhci_hcd:usb4
508: 378 139 PCI-MSI-edge eth0
NMI: 0 0 Non-maskable interrupts
LOC: 295845 239602 Local timer interrupts
RES: 34174 96493 Rescheduling interrupts
CAL: 10832 457 function call interrupts
TLB: 873 742 TLB shootdowns
TRM: 0 0 Thermal event interrupts
THR: 0 0 Threshold APIC interrupts
SPU: 0 0 Spurious interrupts
ERR: 0
I have searched a lot on Internet, and even in the list, and I have
not found a way to change the IRQ assignments. In fact, I have read
some mails that said that I can't do that in a laptop (except in some
Thinkpads, where IRQ can be changed in the BIOS), as in PCs this can
be done changing the card to other slot. In other places, some kernel
parameters were suggested to obtain other IRQ assignments, but the
only parameter that change those in my computer, was "acpi=off", and
it was not better. In this case, /proc/interrupts shows the following:
CPU0
0: 602 XT-PIC-XT timer
1: 209 XT-PIC-XT i8042
2: 0 XT-PIC-XT cascade
8: 0 XT-PIC-XT rtc
10: 2912 XT-PIC-XT uhci_hcd:usb1, uhci_hcd:usb3,
uhci_hcd:usb4, ehci_hcd:usb6, eth1, HDA Intel, i915@pci:0000:00:02.0
11: 0 XT-PIC-XT ehci_hcd:usb2, uhci_hcd:usb5
12: 5196 XT-PIC-XT i8042
14: 9987 XT-PIC-XT libata
15: 704 XT-PIC-XT libata
508: 31 PCI-MSI-edge eth0
NMI: 0 Non-maskable interrupts
LOC: 87955 Local timer interrupts
RES: 0 Rescheduling interrupts
CAL: 0 function call interrupts
TLB: 0 TLB shootdowns
TRM: 0 Thermal event interrupts
THR: 0 Threshold APIC interrupts
SPU: 0 Spurious interrupts
ERR: 0
So, my first question is: is there a way to change my IRQ assignment?,
or that really cannot be done in my laptop? I would like to have it in
a not shared one, not necessarily in IRQ 9, as with rt kernel a
priority raise of an IRQ can be done with chrt.
I have also read, that the HDA sound card is not good for audio
processing. I am just starting to configure my whole "synthetizer
box", so by this time, I am only making some tests with it. But, for
the near future, which usb sound card would you recommend?.
I also wonder that, if the IRQ of USB ports cannot be change too, I
would have some of them sharing some IRQ. Would that affect the
performance, having an usb sound card?. And what about the performance
of the midi events for the keyboards connected to the laptop?.
Thanks very much,
tizo
26 Feb
26 Feb
5:35 p.m.
tizo wrote:
Hi there,
Sorry about my previous mail. I was just starting to write a draft
about the topics I want to ask, and I accidentally push the send
button.
Well, my goal is to play two midi keyboards, sending the events
through jackd, to qsynth. My computer is a Laptop HP 550, with HDA
Intel sound card, 3 GB of memory, and a Core 2 DUO CPU of 1.40 GHz. My
OS is UbuntuStudio 8.04, with kernel 2.6.24-23-rt.
First of all, I cannot run jackd without xruns, if I configure it with
32 frames per period, or less. I am running it as root, with realtime,
and a priority of 70. As soon as I run it, it starts to count xruns,
and I am only executing jackd.
Looking at the different IRQ, I have saw that my sound card is sharing
the IRQ 16 with an USB port, and the video driver. This is a cat of
/proc/interrupts:
CPU0 CPU1
0: 1026591 1099066 IO-APIC-edge timer
1: 2060 839 IO-APIC-edge i8042
8: 0 1 IO-APIC-edge rtc
9: 121 95 IO-APIC-fasteoi acpi
12: 118454 56308 IO-APIC-edge i8042
14: 6410 5638 IO-APIC-edge libata
15: 5167 6228 IO-APIC-edge libata
16: 624 482 IO-APIC-fasteoi uhci_hcd:usb1, HDA
Intel, i915@pci:0000:00:02.0
17: 24009 14458 IO-APIC-fasteoi eth1
18: 0 0 IO-APIC-fasteoi ehci_hcd:usb2, uhci_hcd:usb5
20: 0 0 IO-APIC-fasteoi uhci_hcd:usb3, ehci_hcd:usb6
21: 0 0 IO-APIC-fasteoi uhci_hcd:usb4
508: 378 139 PCI-MSI-edge eth0
NMI: 0 0 Non-maskable interrupts
LOC: 295845 239602 Local timer interrupts
RES: 34174 96493 Rescheduling interrupts
CAL: 10832 457 function call interrupts
TLB: 873 742 TLB shootdowns
TRM: 0 0 Thermal event interrupts
THR: 0 0 Threshold APIC interrupts
SPU: 0 0 Spurious interrupts
ERR: 0
I have searched a lot on Internet, and even in the list, and I have
not found a way to change the IRQ assignments. In fact, I have read
some mails that said that I can't do that in a laptop (except in some
Thinkpads, where IRQ can be changed in the BIOS), as in PCs this can
be done changing the card to other slot. In other places, some kernel
parameters were suggested to obtain other IRQ assignments, but the
only parameter that change those in my computer, was "acpi=off", and
it was not better. In this case, /proc/interrupts shows the following:
CPU0
0: 602 XT-PIC-XT timer
1: 209 XT-PIC-XT i8042
2: 0 XT-PIC-XT cascade
8: 0 XT-PIC-XT rtc
10: 2912 XT-PIC-XT uhci_hcd:usb1, uhci_hcd:usb3,
uhci_hcd:usb4, ehci_hcd:usb6, eth1, HDA Intel, i915@pci:0000:00:02.0
11: 0 XT-PIC-XT ehci_hcd:usb2, uhci_hcd:usb5
12: 5196 XT-PIC-XT i8042
14: 9987 XT-PIC-XT libata
15: 704 XT-PIC-XT libata
508: 31 PCI-MSI-edge eth0
NMI: 0 Non-maskable interrupts
LOC: 87955 Local timer interrupts
RES: 0 Rescheduling interrupts
CAL: 0 function call interrupts
TLB: 0 TLB shootdowns
TRM: 0 Thermal event interrupts
THR: 0 Threshold APIC interrupts
SPU: 0 Spurious interrupts
ERR: 0
So, my first question is: is there a way to change my IRQ assignment?,
or that really cannot be done in my laptop? I would like to have it in
a not shared one, not necessarily in IRQ 9, as with rt kernel a
priority raise of an IRQ can be done with chrt.
Probably not. But check your bios anyway just in case you can reassign
the irq there.
I have also read, that the HDA sound card is not good
for audio
processing. I am just starting to configure my whole "synthetizer
box", so by this time, I am only making some tests with it. But, for
the near future, which usb sound card would you recommend?.
The hda should give you reasonable audio quality and performance but you
will get better of both worlds with a professional sound card.
Make sure it is usb-2.0 capable if you must use a usb sound card. You
could also look into a firewire device which tend to have better latency
performance.
I also wonder that, if the IRQ of USB ports cannot be
change too, I
would have some of them sharing some IRQ. Would that affect the
performance, having an usb sound card?. And what about the performance
of the midi events for the keyboards connected to the laptop?.
If you can get the realtime kernel running it will improve latency
performance. But you might find that a standard kernel is good enough
for your general needs.
Thanks very much,
tizo
_______________________________________________
Linux-audio-user mailing list
Linux-audio-user(a)lists.linuxaudio.org
http://lists.linuxaudio.org/mailman/listinfo/linux-audio-user
--
Patrick Shirkey
Boost Hardware Ltd.
27 Feb
27 Feb
10:42 a.m.
On Thu, Feb 26, 2009 at 7:35 PM, Patrick Shirkey
<pshirkey(a)boosthardware.com> wrote:
Ok, thanks.
Actually, I am using a realtime kernel. Anyway, I have to make some
more test with the midi keyboards. With one of them, I can play right,
with 64 or 128 fpp, although there are some xruns.
Thanks,
tizo
tizo wrote:
I had already checked that; it is not a possibility in my computer.
Hi there,
Sorry about my previous mail. I was just starting to write a draft
about the topics I want to ask, and I accidentally push the send
button.
Well, my goal is to play two midi keyboards, sending the events
through jackd, to qsynth. My computer is a Laptop HP 550, with HDA
Intel sound card, 3 GB of memory, and a Core 2 DUO CPU of 1.40 GHz. My
OS is UbuntuStudio 8.04, with kernel 2.6.24-23-rt.
First of all, I cannot run jackd without xruns, if I configure it with
32 frames per period, or less. I am running it as root, with realtime,
and a priority of 70. As soon as I run it, it starts to count xruns,
and I am only executing jackd.
Looking at the different IRQ, I have saw that my sound card is sharing
the IRQ 16 with an USB port, and the video driver. This is a cat of
/proc/interrupts:
CPU0 CPU1
0: 1026591 1099066 IO-APIC-edge timer
1: 2060 839 IO-APIC-edge i8042
8: 0 1 IO-APIC-edge rtc
9: 121 95 IO-APIC-fasteoi acpi
12: 118454 56308 IO-APIC-edge i8042
14: 6410 5638 IO-APIC-edge libata
15: 5167 6228 IO-APIC-edge libata
16: 624 482 IO-APIC-fasteoi uhci_hcd:usb1, HDA
Intel, i915@pci:0000:00:02.0
17: 24009 14458 IO-APIC-fasteoi eth1
18: 0 0 IO-APIC-fasteoi ehci_hcd:usb2,
uhci_hcd:usb5
20: 0 0 IO-APIC-fasteoi uhci_hcd:usb3,
ehci_hcd:usb6
21: 0 0 IO-APIC-fasteoi uhci_hcd:usb4
508: 378 139 PCI-MSI-edge eth0
NMI: 0 0 Non-maskable interrupts
LOC: 295845 239602 Local timer interrupts
RES: 34174 96493 Rescheduling interrupts
CAL: 10832 457 function call interrupts
TLB: 873 742 TLB shootdowns
TRM: 0 0 Thermal event interrupts
THR: 0 0 Threshold APIC interrupts
SPU: 0 0 Spurious interrupts
ERR: 0
I have searched a lot on Internet, and even in the list, and I have
not found a way to change the IRQ assignments. In fact, I have read
some mails that said that I can't do that in a laptop (except in some
Thinkpads, where IRQ can be changed in the BIOS), as in PCs this can
be done changing the card to other slot. In other places, some kernel
parameters were suggested to obtain other IRQ assignments, but the
only parameter that change those in my computer, was "acpi=off", and
it was not better. In this case, /proc/interrupts shows the following:
CPU0
0: 602 XT-PIC-XT timer
1: 209 XT-PIC-XT i8042
2: 0 XT-PIC-XT cascade
8: 0 XT-PIC-XT rtc
10: 2912 XT-PIC-XT uhci_hcd:usb1, uhci_hcd:usb3,
uhci_hcd:usb4, ehci_hcd:usb6, eth1, HDA Intel, i915@pci:0000:00:02.0
11: 0 XT-PIC-XT ehci_hcd:usb2, uhci_hcd:usb5
12: 5196 XT-PIC-XT i8042
14: 9987 XT-PIC-XT libata
15: 704 XT-PIC-XT libata
508: 31 PCI-MSI-edge eth0
NMI: 0 Non-maskable interrupts
LOC: 87955 Local timer interrupts
RES: 0 Rescheduling interrupts
CAL: 0 function call interrupts
TLB: 0 TLB shootdowns
TRM: 0 Thermal event interrupts
THR: 0 Threshold APIC interrupts
SPU: 0 Spurious interrupts
ERR: 0
So, my first question is: is there a way to change my IRQ assignment?,
or that really cannot be done in my laptop? I would like to have it in
a not shared one, not necessarily in IRQ 9, as with rt kernel a
priority raise of an IRQ can be done with chrt.
Probably not. But check your bios anyway just in case you can reassign the
irq there.
I have also
read, that the HDA sound card is not good for audio
processing. I am just starting to configure my whole "synthetizer
box", so by this time, I am only making some tests with it. But, for
the near future, which usb sound card would you recommend?.
The hda should give you reasonable audio quality and performance but you
will get better of both worlds with a professional sound card.
Make sure it is usb-2.0 capable if you must use a usb sound card. You could
also look into a firewire device which tend to have better latency
performance.
I also wonder
that, if the IRQ of USB ports cannot be change too, I
would have some of them sharing some IRQ. Would that affect the
performance, having an usb sound card?. And what about the performance
of the midi events for the keyboards connected to the laptop?.
If you can get the realtime kernel running it will improve latency
performance. But you might find that a standard kernel is good enough for
your general needs.
Thanks very
much,
tizo
_______________________________________________
Linux-audio-user mailing list
Linux-audio-user(a)lists.linuxaudio.org
http://lists.linuxaudio.org/mailman/listinfo/linux-audio-user
--
Patrick Shirkey
Boost Hardware Ltd.
26 Feb
26 Feb
5:55 p.m.
On Thu, 26 Feb 2009 19:20:48 -0200
tizo <tizone(a)gmail.com> wrote:
Looking at the different IRQ, I have saw that my sound
card is sharing
the IRQ 16 with an USB port, and the video driver. This is a cat of
/proc/interrupts:
I have searched a lot on Internet, and even in the list, and I have
not found a way to change the IRQ assignments. In fact, I have read
some mails that said that I can't do that in a laptop (except in some
Thinkpads, where IRQ can be changed in the BIOS), as in PCs this can
be done changing the card to other slot. In other places, some kernel
parameters were suggested to obtain other IRQ assignments, but the
only parameter that change those in my computer, was "acpi=off", and
it was not better. In this case, /proc/interrupts shows the following:
When you load the snd-hda-intel module include the enable_msi=1 option.
I do this on my laptop by adding the line:
options snd-hda-intel enable_msi=1
to my /etc/modprobe.d/sound file (but the file may be different on
your distro. I use Slackware.)
This moves my sound card to an interrupt of its own on my laptop.
HTH,
Brad
10:53 p.m.
On Thu, Feb 26, 2009 at 11:55:42PM +0200, Bradley Reed wrote:
On Thu, 26 Feb 2009 19:20:48 -0200
tizo <tizone(a)gmail.com> wrote:
Holy cow, it works!! Thanks!
I've seen the advice to use enable_msi but never saw an explanation of WHY to do that
or what it did, so I stayed away from it.
It's awesome. I can actually run seq24 on my EEE with my full suite of basic keyboard
sounds, and the screen updates often enough to make it almost usable.
Not that I'm going to do any serious work on an EEE with the built-in HDA-Intel card,
but it does in fact work, well enough for street performances and possibly casual gigs
too.
-ken
Looking at the different IRQ, I have saw that my
sound card is sharing
the IRQ 16 with an USB port, and the video driver. This is a cat of
/proc/interrupts:
I have searched a lot on Internet, and even in the list, and I have
not found a way to change the IRQ assignments. In fact, I have read
some mails that said that I can't do that in a laptop (except in some
Thinkpads, where IRQ can be changed in the BIOS), as in PCs this can
be done changing the card to other slot. In other places, some kernel
parameters were suggested to obtain other IRQ assignments, but the
only parameter that change those in my computer, was "acpi=off", and
it was not better. In this case, /proc/interrupts shows the following:
When you load the snd-hda-intel module include the enable_msi=1 option.
I do this on my laptop by adding the line:
options snd-hda-intel enable_msi=1
to my /etc/modprobe.d/sound file (but the file may be different on
your distro. I use Slackware.)
This moves my sound card to an interrupt of its own on my laptop.
27 Feb
27 Feb
10:18 a.m.
2009/2/26 Bradley Reed <bradreed1(a)gmail.com>om>:
When
you load the snd-hda-intel module include the enable_msi=1 option.
I do this on my laptop by adding the line:
options snd-hda-intel enable_msi=1
to my /etc/modprobe.d/sound file (but the file may be different on
your distro. I use Slackware.)
This moves my sound card to an interrupt of its own on my laptop.
Thanks.
Does that work for other drivers too, or is the msi option HDA specific.
11:12 a.m.
On Fri, 27 Feb 2009 15:18:55 +0100
Emanuel Rumpf <xbran(a)web.de> wrote:
2009/2/26 Bradley Reed <bradreed1(a)gmail.com>om>:
When you load the snd-hda-intel module include the enable_msi=1
option. I do this on my laptop by adding the line:
options snd-hda-intel enable_msi=1
to my /etc/modprobe.d/sound file (but the file may be different on
your distro. I use Slackware.)
This moves my sound card to an interrupt of its own on my laptop.
Thanks.
Does that work for other drivers too, or is the msi option HDA
specific. _______________________________________________
I think that it may be HDA specific, but there may be a similar option
for other cards that use the ALSA drivers. Check the
Documentation/sound/alsa/ALSA-Configuration.txt file in your kernel
source.
Brad
10:51 a.m.
On Thu, Feb 26, 2009 at 7:55 PM, Bradley Reed <bradreed1(a)gmail.com> wrote:
On Thu, 26 Feb 2009 19:20:48 -0200
tizo <tizone(a)gmail.com> wrote:
That work perfectly. In my ubuntustudio the file to edit was
/etc/modprobe.d/alsa-base. My sound card now has its own IRQ (508).
I raise the priority of that IRQ, but sadly, the latency of jack did
not improve.
Thanks very much,
tizo
Looking at the different IRQ, I have saw that my
sound card is sharing
the IRQ 16 with an USB port, and the video driver. This is a cat of
/proc/interrupts:
I have searched a lot on Internet, and even in the list, and I have
not found a way to change the IRQ assignments. In fact, I have read
some mails that said that I can't do that in a laptop (except in some
Thinkpads, where IRQ can be changed in the BIOS), as in PCs this can
be done changing the card to other slot. In other places, some kernel
parameters were suggested to obtain other IRQ assignments, but the
only parameter that change those in my computer, was "acpi=off", and
it was not better. In this case, /proc/interrupts shows the following:
When you load the snd-hda-intel module include the enable_msi=1 option.
I do this on my laptop by adding the line:
options snd-hda-intel enable_msi=1
to my /etc/modprobe.d/sound file (but the file may be different on
your distro. I use Slackware.)
This moves my sound card to an interrupt of its own on my laptop.
HTH,
Brad
_______________________________________________
Linux-audio-user mailing list
Linux-audio-user(a)lists.linuxaudio.org
http://lists.linuxaudio.org/mailman/listinfo/linux-audio-user
26 Feb
26 Feb
7:21 p.m.
On Thu, Feb 26, 2009 at 4:20 PM, tizo <tizone(a)gmail.com> wrote:
Hi there,
Sorry about my previous mail. I was just starting to write a draft
about the topics I want to ask, and I accidentally push the send
button.
Well, my goal is to play two midi keyboards, sending the events
through jackd, to qsynth. My computer is a Laptop HP 550, with HDA
Intel sound card, 3 GB of memory, and a Core 2 DUO CPU of 1.40 GHz. My
OS is UbuntuStudio 8.04, with kernel 2.6.24-23-rt.
First of all, I cannot run jackd without xruns, if I configure it with
32 frames per period, or less. I am running it as root, with realtime,
and a priority of 70. As soon as I run it, it starts to count xruns,
and I am only executing jackd.
32 frames per interrupt is VERY ambitious with an Intel HDA chipset. Its not
impossible but every single part of your system has to be "just right" for
this to work. I would start with a less ambitious goal first, and get some
experience with the setup before trying to get all the way to this latency
level.
moving to USB will likely make things worse. latencies like this are best
accomplished with good, prosumer level PCI audio interfaces.
--p
10:39 p.m.
On Thu, Feb 26, 2009 at 06:21:48PM -0500, Paul Davis wrote:
On Thu, Feb 26, 2009 at 4:20 PM, tizo
<tizone(a)gmail.com> wrote:
and most certainly not with a kernel that old.
the old hda drivers are totally broken.
a quick test on vanilla 2.6.28 shows it runs at -p32 -n3.
but it gives me some xruns when i switch desktop.
-n2 is not possible. i get xrun streams.
--
torben Hohn
http://galan.sourceforge.net -- The graphical Audio language
Hi there,
Sorry about my previous mail. I was just starting to write a draft
about the topics I want to ask, and I accidentally push the send
button.
Well, my goal is to play two midi keyboards, sending the events
through jackd, to qsynth. My computer is a Laptop HP 550, with HDA
Intel sound card, 3 GB of memory, and a Core 2 DUO CPU of 1.40 GHz. My
OS is UbuntuStudio 8.04, with kernel 2.6.24-23-rt.
First of all, I cannot run jackd without xruns, if I configure it with
32 frames per period, or less. I am running it as root, with realtime,
and a priority of 70. As soon as I run it, it starts to count xruns,
and I am only executing jackd.
32 frames per interrupt is VERY ambitious with an Intel HDA chipset. Its not
impossible but every single part of your system has to be "just right" for
this to work. I would start with a less ambitious goal first, and get some
experience with the setup before trying to get all the way to this latency
level.
moving to USB will likely make things worse. latencies like this are best
accomplished with good, prosumer level PCI audio interfaces.
27 Feb
27 Feb
11:11 a.m.
On Fri, Feb 27, 2009 at 12:36 AM, <torbenh(a)gmx.de> wrote:
On Thu, Feb 26, 2009 at 06:21:48PM -0500, Paul Davis
wrote:
I have tried UbuntuStudio 8.10; I can't remember nor the version of
the kernel, neither the jack performance, but that kernel had a
reported bug, that broke the usb connections with midi keyboards.
Maybe I will try another distribution and/or kernel, but that bug has
to be fixed for me to be useful.
I am running jackd with -n3 too; as you said, with -n3 is not possible.
On Thu, Feb 26, 2009 at 4:20 PM, tizo
<tizone(a)gmail.com> wrote:
and most certainly not with a kernel that old.
the old hda drivers are totally broken.
a quick test on vanilla 2.6.28 shows it runs at -p32 -n3.
but it gives me some xruns when i switch desktop.
-n2 is not possible. i get xrun streams.
Hi there,
Sorry about my previous mail. I was just starting to write a draft
about the topics I want to ask, and I accidentally push the send
button.
Well, my goal is to play two midi keyboards, sending the events
through jackd, to qsynth. My computer is a Laptop HP 550, with HDA
Intel sound card, 3 GB of memory, and a Core 2 DUO CPU of 1.40 GHz. My
OS is UbuntuStudio 8.04, with kernel 2.6.24-23-rt.
First of all, I cannot run jackd without xruns, if I configure it with
32 frames per period, or less. I am running it as root, with realtime,
and a priority of 70. As soon as I run it, it starts to count xruns,
and I am only executing jackd.
32 frames per interrupt is VERY ambitious with an Intel HDA chipset. Its not
impossible but every single part of your system has to be "just right" for
this to work. I would start with a less ambitious goal first, and get some
experience with the setup before trying to get all the way to this latency
level.
moving to USB will likely make things worse. latencies like this are best
accomplished with good, prosumer level PCI audio interfaces.
--
torben Hohn
http://galan.sourceforge.net -- The graphical Audio language
_______________________________________________
Linux-audio-user mailing list
Linux-audio-user(a)lists.linuxaudio.org
http://lists.linuxaudio.org/mailman/listinfo/linux-audio-user
Thanks very much,
tizo
11:13 a.m.
On Fri, Feb 27, 2009 at 1:11 PM, tizo <tizone(a)gmail.com> wrote:
On Fri, Feb 27, 2009 at 12:36 AM,
<torbenh(a)gmx.de> wrote:
I meant "with -n2 is not possible".
On Thu, Feb 26, 2009 at 06:21:48PM -0500, Paul
Davis wrote:
I have tried UbuntuStudio 8.10; I can't remember nor the version of
the kernel, neither the jack performance, but that kernel had a
reported bug, that broke the usb connections with midi keyboards.
Maybe I will try another distribution and/or kernel, but that bug has
to be fixed for me to be useful.
I am running jackd with -n3 too; as you said, with -n3 is not possible. On Thu, Feb 26, 2009 at 4:20 PM, tizo
<tizone(a)gmail.com> wrote:
and most certainly not with a kernel that old.
the old hda drivers are totally broken.
a quick test on vanilla 2.6.28 shows it runs at -p32 -n3.
but it gives me some xruns when i switch desktop.
-n2 is not possible. i get xrun streams.
Hi there,
Sorry about my previous mail. I was just starting to write a draft
about the topics I want to ask, and I accidentally push the send
button.
Well, my goal is to play two midi keyboards, sending the events
through jackd, to qsynth. My computer is a Laptop HP 550, with HDA
Intel sound card, 3 GB of memory, and a Core 2 DUO CPU of 1.40 GHz. My
OS is UbuntuStudio 8.04, with kernel 2.6.24-23-rt.
First of all, I cannot run jackd without xruns, if I configure it with
32 frames per period, or less. I am running it as root, with realtime,
and a priority of 70. As soon as I run it, it starts to count xruns,
and I am only executing jackd.
32 frames per interrupt is VERY ambitious with an Intel HDA chipset. Its not
impossible but every single part of your system has to be "just right" for
this to work. I would start with a less ambitious goal first, and get some
experience with the setup before trying to get all the way to this latency
level.
moving to USB will likely make things worse. latencies like this are best
accomplished with good, prosumer level PCI audio interfaces.
--
torben Hohn
http://galan.sourceforge.net -- The graphical Audio language
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Thanks very much,
tizo
11:02 a.m.
On Thu, Feb 26, 2009 at 9:21 PM, Paul Davis <paul(a)linuxaudiosystems.com> wrote:
On Thu, Feb 26, 2009 at 4:20 PM, tizo <tizone(a)gmail.com> wrote:
Ok. As I said in another email, I have to make more serious tests with
both midi keyboards, but I think that I could play right with 64 or
128 frames (with some xruns).
Anyway, I am thinking in buy a new desktop PC, and use it with my old
Sound Blaster Live. I guess that I could do much more things with that
configuration, not just play. How about the performance of that card?.
Hi there,
Sorry about my previous mail. I was just starting to write a draft
about the topics I want to ask, and I accidentally push the send
button.
Well, my goal is to play two midi keyboards, sending the events
through jackd, to qsynth. My computer is a Laptop HP 550, with HDA
Intel sound card, 3 GB of memory, and a Core 2 DUO CPU of 1.40 GHz. My
OS is UbuntuStudio 8.04, with kernel 2.6.24-23-rt.
First of all, I cannot run jackd without xruns, if I configure it with
32 frames per period, or less. I am running it as root, with realtime,
and a priority of 70. As soon as I run it, it starts to count xruns,
and I am only executing jackd.
32 frames per interrupt is VERY ambitious with an Intel HDA chipset. Its not
impossible but every single part of your system has to be "just right" for
this to work. I would start with a less ambitious goal first, and get some
experience with the setup before trying to get all the way to this latency
level.
moving to USB will likely make things worse. latencies like this are best
accomplished with good, prosumer level PCI audio interfaces.
--p
5750
days inactive
5751
days old
linux-audio-user@lists.linuxaudio.org
12 comments
7 participants
participants (7)
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Bradley Reed -
Emanuel Rumpf -
Ken Restivo -
Patrick Shirkey -
Paul Davis -
tizo -
torbenh＠gmx.de