29 Sep
2004
29 Sep
'04
12:08 p.m.
Hey,
In the ongoing attempt to eliminate xruns, I've set
Option "no_accel" "yes" in the XF86Config.
Watching the screen redraw is like a valume overdose.
I've done this without really knowing why it will help
or whether it has. Assuming that it has helped, I
probably have to live with it.
I am using Planet CCRMA with KDE and have a runlevel
for Desktop work and another for audio work. I boot
into runlevel 5 and then use telinit to switch to 3.
Is it possible to specify xf86config files for each of
these runlevels?
Or is there another method for a user to turn
acceleration on and off?
Is anyone else turning off acceleration and how do you
deal with the performance?
ron
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29 Sep
29 Sep
12:58 p.m.
On Wed, 2004-09-29 at 09:51, R Parker wrote:
Hey,
In the ongoing attempt to eliminate xruns, I've set
Option "no_accel" "yes" in the XF86Config.
Watching the screen redraw is like a valume overdose.
I've done this without really knowing why it will help
or whether it has. Assuming that it has helped, I
probably have to live with it.
You should not have to disable acceleration. I suggested this to rule
out a buggy video driver. If you have one, it will be really obvious.
If it doesn't make a difference, then just turn it back on.
Lee
1:10 p.m.
On Wed, 2004-09-29 at 09:51, R Parker wrote:
Hey,
In the ongoing attempt to eliminate xruns, I've set
Option "no_accel" "yes" in the XF86Config.
[snip]
Or is there another method for a user to turn
acceleration on and off?
Is anyone else turning off acceleration and how do you
deal with the performance?
ron
I don't think turning off acceleration is going to do anything
beneficial for you - it could actually be counterproductive since X is
going to be eating a /lot/ more CPU.
You might want to turn off DRI direct rendering though, as that will
free up an interrupt.
-DR-
2:42 p.m.
--- Dave Robillard <drobilla(a)connect.carleton.ca>
wrote:
On Wed, 2004-09-29 at 09:51, R Parker wrote:
Thanks for the suggestions. Acceleration is back on
and DRI is off, oh, what a relief it is.
I suspect my system has a more serious problem and
that I am essentially tweaking the leaves while the
roots are infected.
I'm running an ICP hardware raid controler with raid
level 5 and reiserfs. In addition to that, I run an
rsync mirror to an IDE drive. I'm considering
switching from raid 5 to 0 because I do see read
problems and maybe some of the xruns occur during
write. The read problems appear with Ardour while
doing REW or F/FWD seeks and the messages are
something about disk read access error.
I've tried to google up some hints for performance
tuning with hardware raid but haven't found any
obvious suggestions. With the mirror running every 24
hours, I can probably afford to forgo the hardware
redundancy.
Maybe someone has some insites into hardware scsi raid
performance. I'd be happy to investigate any
suggestions.
ron
Hey,
In the ongoing attempt to eliminate xruns, I've
set
Option "no_accel" "yes" in
the XF86Config.
[snip]
Or is there another method for a user to turn
acceleration on and off?
Is anyone else turning off acceleration and how do
you
deal with the performance?
ron
I don't think turning off acceleration is going to
do anything
beneficial for you - it could actually be
counterproductive since X is
going to be eating a /lot/ more CPU.
You might want to turn off DRI direct rendering
though, as that will
free up an interrupt. -DR-
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2:53 p.m.
On Wed, Sep 29, 2004 at 09:24:58AM -0700, R Parker wrote:
I'm running an ICP hardware raid controler with
raid
level 5 and reiserfs. In addition to that, I run an
rsync mirror to an IDE drive. I'm considering
switching from raid 5 to 0 because I do see read
problems and maybe some of the xruns occur during
write. The read problems appear with Ardour while
doing REW or F/FWD seeks and the messages are
something about disk read access error.
Try using something other than reiser too, it has been known to cause
realtime problems in some kernels.
I've tried to google up some hints for
performance
tuning with hardware raid but haven't found any
obvious suggestions. With the mirror running every 24
hours, I can probably afford to forgo the hardware
redundancy.
The stripe size is the one that matters most IME. With hardware you
shouldn't be seeing any performacen problems with RAID5 (or with software
for that matter). It is possible that the card or driver is hogging the
PCI bus though.
If its a server motherboard, some of the PCI slots may belong to different
PCI buses, if yours is like that you could try putting the RAID controller
on a bus of its own. I dont know how to tell in software, but the manual
should say.
- Steve
2:58 p.m.
On Wed, 2004-09-29 at 12:24, R Parker wrote:
I'm running an ICP hardware raid controler with
raid
level 5 and reiserfs. In addition to that, I run an
rsync mirror to an IDE drive. I'm considering
switching from raid 5 to 0 because I do see read
problems and maybe some of the xruns occur during
write. The read problems appear with Ardour while
doing REW or F/FWD seeks and the messages are
something about disk read access error.
The problem is most likely reiserfs. Ext3 is better for low latency
systems.
If you are using 2.4, then maybe you should try a 2.6 + VP kernel. It's
pretty stable these days, but I still recommend doing this on a spare
box if you have any serious work to do.
Lee
3:15 p.m.
New subject: [linux-audio-user] audio kernel compilation...
I need to dive into the world of compiling my first kernel. It will be for an
RPM based distro and I want it to be the 2.6 kernel with VP and realtime-lsm
patches and alsa drivers built in.
What is my simplest path to do this?
thanks for any help...
R~
--
The Road of Life is paved with Squirrels that couldn't make a decision!
3:39 p.m.
New subject: [linux-audio-user] audio kernel compilation...
On Wed, 2004-09-29 at 12:59, Russell Hanaghan wrote:
I need to dive into the world of compiling my first
kernel. It will be for an
RPM based distro and I want it to be the 2.6 kernel with VP and realtime-lsm
patches and alsa drivers built in.
What is my simplest path to do this?
If you already use an RPM based distro you can just use the CCRMA
RPM's. No need to compile it. Check the archives (this list and the
CCRMA list) for more info.
Lee
4:03 p.m.
New subject: [linux-audio-user] audio kernel compilation...
On Wednesday 29 September 2004 10:24 am, Lee Revell wrote:
On Wed, 2004-09-29 at 12:59, Russell Hanaghan wrote:
The Fedora kernels "break" this distro. All is optimized for i686...AFAIK.
I'm not sure but I also think there is an issue with nptl in this distro.
Isn't that what realtime-lsm is based on??
Again, forgive my complete ignorance here...but this is how I learn such
things.
R~
I need to dive into the world of compiling my
first kernel. It will be
for an RPM based distro and I want it to be the 2.6 kernel with VP and
realtime-lsm patches and alsa drivers built in.
What is my simplest path to do this?
If you already use an RPM based distro you can just use the CCRMA
RPM's. No need to compile it. Check the archives (this list and the
CCRMA list) for more info.
Lee
--
The Road of Life is paved with Squirrels that couldn't make a decision!
4:16 p.m.
New subject: [linux-audio-user] audio kernel compilation...
No, realtime-lsm isn't based on nptl. RHEL3 uses nptl and so will give
you trouble with a hand-rolled kernel, I didn't catch what distro
you're running but if it's from redhat I guess there's a possibility
they're doing the same thing.
On Wed, 29 Sep 2004 10:47:25 -0700, Russell Hanaghan
<hanaghan(a)starband.net> wrote:
On Wednesday 29 September 2004 10:24 am, Lee Revell wrote:
--
De gustibus non disputandum est.
On Wed, 2004-09-29 at 12:59, Russell Hanaghan
wrote:
The Fedora kernels "break" this distro. All is optimized for i686...AFAIK.
I'm not sure but I also think there is an issue with nptl in this distro.
Isn't that what realtime-lsm is based on??
Again, forgive my complete ignorance here...but this is how I learn such
things.
R~
I need to dive into the world of compiling my
first kernel. It will be
for an RPM based distro and I want it to be the 2.6 kernel with VP and
realtime-lsm patches and alsa drivers built in.
What is my simplest path to do this?
If you already use an RPM based distro you can just use the CCRMA
RPM's. No need to compile it. Check the archives (this list and the
CCRMA list) for more info.
Lee
--
The Road of Life is paved with Squirrels that couldn't make a decision!
4:23 p.m.
New subject: [linux-audio-user] audio kernel compilation...
On Wed, 2004-09-29 at 13:47, Russell Hanaghan wrote:
On Wednesday 29 September 2004 10:24 am, Lee Revell
wrote:
Oh, OK. I saw RPM and assumed you are running Fedora. Anyway, if you
use an RPM based distro you might be able to use the Planet CCRMA kernel
anyway.
Otherwise, if you need to install from source, see the wiki link that
Florian posted, it has up to date instructions.
Lee
On Wed, 2004-09-29 at 12:59, Russell Hanaghan
wrote:
The Fedora kernels "break" this distro. All is optimized for i686...AFAIK.
I'm not sure but I also think there is an issue with nptl in this distro.
Isn't that what realtime-lsm is based on??
I need to dive into the world of compiling my
first kernel. It will be
for an RPM based distro and I want it to be the 2.6 kernel with VP and
realtime-lsm patches and alsa drivers built in.
What is my simplest path to do this?
If you already use an RPM based distro you can just use the CCRMA
RPM's. No need to compile it. Check the archives (this list and the
CCRMA list) for more info.
3:48 p.m.
New subject: [linux-audio-user] audio kernel compilation...
For that matter, some of us with experience don't know what this VP
thing is or where it is. Is there a page/wiki that has the 'latest and
greatest' low-latency kernel info?
On Wed, 29 Sep 2004 09:59:27 -0700, Russell Hanaghan
<hanaghan(a)starband.net> wrote:
I need to dive into the world of compiling my first
kernel. It will be for an
RPM based distro and I want it to be the 2.6 kernel with VP and realtime-lsm
patches and alsa drivers built in.
What is my simplest path to do this?
thanks for any help...
R~
--
The Road of Life is paved with Squirrels that couldn't make a decision!
--
De gustibus non disputandum est.
3:58 p.m.
New subject: [linux-audio-user] audio kernel compilation...
On Wed, 29 Sep 2004 11:31:02 -0600
Hans Fugal <fugalh(a)gmail.com> wrote:
For that matter, some of us with experience don't
know what this VP
thing is or where it is. Is there a page/wiki that has the 'latest and
greatest' low-latency kernel info?
I have aquired some info on my right-now-not-really-up-to-date linux
2.6.x low lat wiki:
http://www.affenbande.org/~tapas/linux-2.6.x-ll.html
flo
4:09 p.m.
New subject: [linux-audio-user] audio kernel compilation...
On Wed, 2004-09-29 at 13:55, Florian Schmidt wrote:
On Wed, 29 Sep 2004 11:31:02 -0600
Hans Fugal <fugalh(a)gmail.com> wrote:
One thing I noticed needs updating is that the wiki says there are no
2.6+VP kernel binaries available. Apparently there are some available
now. If anyone has a link I will update the wiki page.
Lee
For that matter, some of us with experience
don't know what this VP
thing is or where it is. Is there a page/wiki that has the 'latest and
greatest' low-latency kernel info?
I have aquired some info on my right-now-not-really-up-to-date linux
2.6.x low lat wiki:
http://www.affenbande.org/~tapas/linux-2.6.x-ll.html
4:26 p.m.
New subject: [linux-audio-user] audio kernel compilation...
On Wed, 2004-09-29 at 13:52, Lee Revell wrote:
On Wed, 2004-09-29 at 13:55, Florian Schmidt wrote:
If any Debian users feel lucky, there are some completely untested .debs
here:
http://gluck.debian.org/~jordens/debs-i386/
No idea which version of VP they are, they just have a date on them.
Lee
On Wed, 29 Sep 2004 11:31:02 -0600
Hans Fugal <fugalh(a)gmail.com> wrote:
One thing I noticed needs updating is that the wiki says there are no
2.6+VP kernel binaries available. Apparently there are some available
now. If anyone has a link I will update the wiki page.
For that matter, some of us with experience
don't know what this VP
thing is or where it is. Is there a page/wiki that has the 'latest and
greatest' low-latency kernel info?
I have aquired some info on my right-now-not-really-up-to-date linux
2.6.x low lat wiki:
http://www.affenbande.org/~tapas/linux-2.6.x-ll.html
4:39 p.m.
New subject: [linux-audio-user] audio kernel compilation...
On Wed, 2004-09-29 at 13:52, Lee Revell wrote:
On Wed, 2004-09-29 at 13:55, Florian Schmidt wrote:
Sorry, that link I posted does not have 2.6+VP binaries for Debian, it
just has .debs of the VP patch so you can incorporate it in the Debian
kernel build process. I installed the .deb and it seemed to work but I
actually don't know the Debian kbuild process, I just do `make install'.
Here's the link again. It's an APT repository so you can just add it to
your sources list. It also has newer jackd packages than ship with
Debian, and a version of glibc with the NPTL bug fixed.
http://gluck.debian.org/~jordens/debs-i386/
HTH,
Lee
On Wed, 29 Sep 2004 11:31:02 -0600
Hans Fugal <fugalh(a)gmail.com> wrote:
One thing I noticed needs updating is that the wiki says there are no
2.6+VP kernel binaries available. Apparently there are some available
now. If anyone has a link I will update the wiki page. For that matter, some of us with experience
don't know what this VP
thing is or where it is. Is there a page/wiki that has the 'latest and
greatest' low-latency kernel info?
I have aquired some info on my right-now-not-really-up-to-date linux
2.6.x low lat wiki:
http://www.affenbande.org/~tapas/linux-2.6.x-ll.html
4:05 p.m.
New subject: [linux-audio-user] audio kernel compilation...
On Wed, 2004-09-29 at 13:31, Hans Fugal wrote:
For that matter, some of us with experience don't
know what this VP
thing is or where it is. Is there a page/wiki that has the 'latest and
greatest' low-latency kernel info?
I think this has been posted here before but Florian Schmidt's wiki is
the best reference:
http://www.affenbande.org/~tapas/wiki/index.php?Low%20latency%20for%20audio…
Lee
5:53 p.m.
On Wed September 29 2004 10:41, Lee Revell wrote:
On Wed, 2004-09-29 at 12:24, R Parker wrote:
Is there a preferred ext3 mode (i.e. writeback, ordered, etc.) for low latency
systems?
Thanks,
Curtis
I'm running an ICP hardware raid controler
with raid
level 5 and reiserfs. In addition to that, I run an
rsync mirror to an IDE drive. I'm considering
switching from raid 5 to 0 because I do see read
problems and maybe some of the xruns occur during
write. The read problems appear with Ardour while
doing REW or F/FWD seeks and the messages are
something about disk read access error.
The problem is most likely reiserfs. Ext3 is better for low latency
systems.
7421
days inactive
7421
days old
linux-audio-user@lists.linuxaudio.org
17 comments
8 participants
participants (8)
-
Curtis Sloan -
Dave Robillard -
Florian Schmidt -
Hans Fugal -
Lee Revell -
R Parker -
Russell Hanaghan -
Steve Harris