Interesting. I think can get 22.3 msecs right now. I assume I will be able
to use smaller buffer sizes when I upgrade my soundcard. (I think I read
that somewhere but I would love confirmation)
I am using qjackctl launched form the command line as superuser. I will not
let me use a 64, 128 or 256 buffer however. I assume this is related to the
sound card.
Matthew Polashek
Associate Editor, Silver Burdett Ginn - Music
Scott Foresman/Pearson Education
299 Jefferson Road
Parsippany, NJ 07054-0480
office: 973.739.8709
fax: 973.739.8098
Matthew.Polashek(a)scottforesman.com
> ----------
> From: Arnold Krille
> Reply To: A list for linux audio users
> Sent: Friday, March 12, 2004 12:15 PM
> To: A list for linux audio users
> Subject: Re: [linux-audio-user] latency
>
> On Friday 12 March 2004 16:23, Polashek, Matthew wrote:
> > hmm.. excellent. I am thinking of mixing onstage monitors and PA while
> > recording. At what latency do you think the delay would become
> noticeable?
>
> I once tried to use my laptop with ~50msecs for master effects. But the
> musicians complained.
>
> If you start jackd via qjackctl you can see the delay your settings
> produce in
> the bottom right corner of the settings dialog...
>
> Arnold
>
> --
> Get my public-key from pgp.mit.edu or pgp.uni-mainz.de
> ---
> Hi, I am a .signature virus. Please copy me into your ~/.signature and
> send me
> to all your contacts.
> After a month or so log in as root and do a rm / -rf. Or ask your
> administrator to do so...
>
>
>
>
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Hi,
Did I understand correctly: building the realtime module, modifies some of
the modules under the kernel tree?
How can I build a debian package of the kernel then? If I make the kernel
with make-kpkg, I will have the debian package ready, and it will not
include the changes made by realtime?
I really would like to use make-kpkg instead of make modules_install etc.
Any ideas?
Sampo
Jack O'Quin <joq(a)io.com>:
> Eric Dantan Rzewnicki <eric(a)zhevny.com> writes:
>
> > insmod /usr/src/realtime-0.0.3/realtime.ko allcaps=1 gid=29
>
> There's nothing wrong with this.
>
> > I build it, but don't run the make install since doing so wipes out
> > all other modules. That's why I use insmod instead of a modprobe. (I'm
> > open to suggestions on better ways if they exist.)
>
> What happens when you run `make install'?
>
> If you have KERNEL_DIR set correctly, it *should* reinstall all the
> modules configured for your kernel sources. To save time, I usually
> do the kernel `make modules' but no `make modules_install'. Then, the
> realtime `make install' will install everything once.
>
> If we can figure out what's going wrong, I should at least make the
> INSTALL instructions clearer.
> --
> joq
>
Hi!
How little latency do I need to be able to use Ardour to mix live sound?
Matthew Polashek
Associate Editor, Silver Burdett Ginn - Music
Scott Foresman/Pearson Education
299 Jefferson Road
Parsippany, NJ 07054-0480
office: 973.739.8709
fax: 973.739.8098
Matthew.Polashek(a)scottforesman.com
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hey!
i'm new to this list, so hello to all out there, excuse my
overzealousness as i immediately launch into a question!
i'm a fairly experienced linux user but this one has me baffled.. i
have linux installed onto an old blue+white g3, and not the first
time either, this is a fresh install of gentoo, in the past i've
run with the old stable 2.2kernel debian systems which worked
fine... but this install is a little different, i have decided to
run the g3 dual boot with macos9 *shock horror*, and to my surprise
i have now lost the ability to get any sound input..
i'm using the g3 internal soundcard (chip=burgandy) with both the
oss-lite and alsa drivers.. neither driver has improved the
situation.. for a bit of clarity, no sound is passed through the
chip, and capture/recording doesn't work for any of the inputs, in
fact in alsa there are no capture devices available at all and an
inspection of '/proc/asound/card0/pcm0c/sub0/status' reveals the
unfortunate message 'closed'..
on the flipside, os9 has no problems with sound input, which leads
me to suspect that it has control of an internal setting that linux
does not.. i have tried reseting the PRAM, which supposedly resets
macs internal settings to the factory default but this does very
little to solve my problem. considering i use linux for 99% of my
audio computing this problem is just a little bit frustrating..
can anyone shed some light, or perhaps tell me who to politely
abuse! btw, i tried alsa-user-list but my msg is trapped in the
moderation blackhole...
i am running kernels: 2.4.22 & 2.6.3
i have alsa 0.9.7 & 1.0.2
sound *output* works fine!
cheers,
dmotd.
Yes. I have pre-empt enabled from the kernel configuration. Is there
something I need to do from the running system to enable it?
(I mean something like:
echo 1 > /proc/sys/.../lowlatency )
Sampo
Frank Barknecht <fbar(a)footils.org>:
> Hallo,
> Sampo Savolainen hat gesagt: // Sampo Savolainen wrote:
>
> > I'm trying to get jack & ardour working with the 2.6.x kernels. Do you
> > have any hints/tips? I've now tried:
> > debian 2.6.2
> > debian 2.6.3
> > debian 2.6.3 modified with LSM support + realtime module
> > standard 2.6.4-rc2-mm1 (couldn't get realtime module working)
> > standard 2.6.3-mm4 LSM support + realtime module (kinda working..)
> >
> > None of these have provided me with sufficient latency. Jack keeps
> > throwing Ardour out for stupid reasons like closing the mixer window.
> >
> > (with realtime module, I mean http://www.joq.us/realtime/)
> >
> > Is there some magic trick I've forgotten to do, or I haven't heard of?
> I
> > have DMA enabled on my harddrive, and this same system runs like dream
> > with 2.4 kernels.
>
> Just to make sure: you did enable kernel preemption, didn't you?
>
> ciao
> --
> Frank Barknecht _ ______footils.org__
>
----- Edelleenlähetetty viesti päättyy -----
Well nothing special ; dialog box comes with 2 indications : Card : Sis SI7012 and Chip: Analog Devices AD1980
Cursors appears for, in order :
master, master mono, master surround, PCM, Surround, Center, LFE, Line, CD, Mic (with 2 points red above, record I assume), Phone and Aux
That's all ...
well ....
Message: 2
Date: Thu, 11 Mar 2004 19:09:13 +0000
From: "Andreas Andersson" <alhambra5p(a)hotmail.com>
Subject: Re: [linux-audio-user] jack trouble
To: linux-audio-user(a)music.columbia.edu
Message-ID: <BAY14-F9t1FFK7dcLdZ0001159e(a)hotmail.com>
Content-Type: text/plain; format=flowed
What happens when you run alsamixer??
/AA
------------------
Loading driver...
/usr/sbin/alsaconf: line 568: rcalsasound: command not found
Setting default volumes...
===============================================================================
Now ALSA is ready to use.
For adjustment of volumes, please use alsamixer or gamix.
Have a lot of fun!
_________________________________________________________________
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linux-audio-user-request(a)music.columbia.edu wrote:
>Send linux-audio-user mailing list submissions to
> linux-audio-user(a)music.columbia.edu
>
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>than "Re: Contents of linux-audio-user digest..."
>
>
>Today's Topics:
>
> 1. Re: Kernel 2.6.x latency (Frank Barknecht)
> 2. Re: jack trouble (Andreas Andersson)
> 3. a quick ALSA recording question (Dave Phillips)
> 4. Re: Kernel 2.6.x latency (Stephen Hassard)
> 5. Re: Kernel 2.6.x latency (James Stone)
> 6. IRQ settings and low latency (Greg Jednaszewski)
> 7. LilyPond interview on linuxmusician.com (Chris Cannam)
> 8. Re: Kernel 2.6.x latency (Jack O'Quin)
> 9. Re: a quick ALSA recording question (Emiliano Grilli)
> 10. Re: Kernel 2.6.x latency (Jack O'Quin)
> 11. Re: a quick ALSA recording question (Dave Phillips)
> 12. Re: Kernel 2.6.x latency (Stephen Hassard)
>
>
>----------------------------------------------------------------------
>
>Message: 1
>Date: Thu, 11 Mar 2004 18:21:15 +0100
>From: Frank Barknecht <fbar(a)footils.org>
>Subject: Re: [linux-audio-user] Kernel 2.6.x latency
>To: A list for linux audio users <linux-audio-user(a)music.columbia.edu>
>Message-ID: <20040311172115.GB6778(a)fliwatut.scifi>
>Content-Type: text/plain; charset=us-ascii
>
>Hallo,
>Sampo Savolainen hat gesagt: // Sampo Savolainen wrote:
>
>
>
>>Yes. I have pre-empt enabled from the kernel configuration. Is there
>>something I need to do from the running system to enable it?
>>
>>(I mean something like:
>> echo 1 > /proc/sys/.../lowlatency )
>>
>>
>
>No, you don't need something like this for preempt, AFAIK.
>
>Another thing to check would be your X server's nice value. This used
>to be "-10" in older Debians, but should not be set at all with 2.6.
>
>Check this in /etc/X11/Xwrapper.config or
>/etc/X11/Xwrapper.config.xserver-common-debconf
>
>ciao
>
>
Hi,
Has anyone tried the different IO schedulers with 2.6? I've seen some
systems that feel much more responsive with the non-default Deadline
scheduler than the default anticipatory scheduler .. I haven't done any
audio specific latency tests though.
later,
Steve
Jack O'Quin wrote:
> James Stone <stone1(a)btinternet.com> writes:
>
>
>>On Thu, Mar 11, 2004 at 06:21:15PM +0100, Frank Barknecht wrote:
>
>
>>>Another thing to check would be your X server's nice value. This used
>>>to be "-10" in older Debians, but should not be set at all with 2.6.
>
>
>>How disappointing.. I just tried this, and it didn't help.. I was almost
>>sure this was going to work. I am still getting many more xruns than
>>with the low latency 2.4.x kernels though at least I am not getting
>>xruns on opening and closing windows!
>>
>>However, on doing a top in 2.6.x I noticed that quite a few processes
>>are running with a nice of -10 (something called "event" among
>>others..). This does not appear to be the case in 2.4.x.. perhaps this
>>could be the source of the trouble.. not really sure how to fix it
>>though.
>
>
> This makes me wonder if there is a bug in the scheduler. IIUC, a
> realtime thread is *supposed* to have higher priority than any
> non-SCHED_FIFO thread, regardless of "nice" value.
>
> If we can nail down a case where this is definitely happening, someone
> should report it to Andrew Morton.
>
>
>>I will have to stick with 2.4.25 for the time being by the looks of
>>things.
>
>
> You can almost certainly get better low-latency results that way, at
> least for the moment. I hope that over time 2.6.x will become just as
> good.
What happens when you run alsamixer??
/AA
------------------
    Loading driver...
    /usr/sbin/alsaconf: line 568: rcalsasound: command not found
    Setting default volumes...
    ===============================================================================
                                                                                                Â
     Now ALSA is ready to use.
     For adjustment of volumes, please use alsamixer or gamix.
                                                                                                Â
     Have a lot of fun!
                                                                                             Â
_________________________________________________________________
The new MSN 8: smart spam protection and 2 months FREE*
http://join.msn.com/?page=features/junkmail
doing a 'dpkg-reconfigure xserver-common' should allow access to
modifying this.
Frank Barknecht wrote:
> Hallo,
> Sampo Savolainen hat gesagt: // Sampo Savolainen wrote:
>
>
>>Yes. I have pre-empt enabled from the kernel configuration. Is there
>>something I need to do from the running system to enable it?
>>
>>(I mean something like:
>> echo 1 > /proc/sys/.../lowlatency )
>
>
> No, you don't need something like this for preempt, AFAIK.
>
> Another thing to check would be your X server's nice value. This used
> to be "-10" in older Debians, but should not be set at all with 2.6.
>
> Check this in /etc/X11/Xwrapper.config or
> /etc/X11/Xwrapper.config.xserver-common-debconf
>
> ciao
