Re: [linux-audio-user] Problems with RP patch + hdsp + jackd at 96000

Mario Lang wrote :
> Hi.
>
> I recently patched my kernel with the RP patch by Ingo to get rid
> of the many xruns I was getting with my brand new Multiface (PCI).
>
> THe result is somewhat strange, so I thought I'd post a summary here and see
> if someone else has had similar problems:
>
> 1. jackd -d alsa -dhw:1 -p64
> At 48kHz, jackd ran the whole night with SuperCollider connected
> to some of its ports without a single xrun! This is a massive improvement.
> 2. jackd -d alsa -dhw:1 -p64 -r96000
> This used to work without the RP patch applied, it generated some
> xruns, but it used to work. Now, using the RP patch, jackd seem
> to simply hang. If I boot up the SuperCollider synthesis server,
> it results in a "failed to start" message by SC. Normal jack clients
> like jack_lsp do still work, but jackd exits after about 10 seconds or
> so, claiming its watchdog killed it. Without -R, it runs without
> dying, but no audio clients work.
>
> One indication that the problem is really originating from within
> jackd is the fact that -v does not produce any of the load-statistic
> output if used as argument to jackd.
>
> Linux lexx 2.6.12-rt-v0.7.50-10 #1 Wed Jun 22 14:59:13 CEST 2005 i686 GNU/Linux
>
> jackd version 0.99.0 tmpdir /dev/shm protocol 13
>

Hi Mario,

I just did some tests with 2.6.12-RT-V0.7.49-01 and can somehow
reproduce this. In my case jack starts at 96kHz/p64 but stops really
fast being xrun-flooded, but I run a more recent version (jackd version
0.100.1 tmpdir /dev/shm protocol 15).

The culprit seems to be the 'Precise Pointer' at these settings.
I set it to be the default a couple of months ago.
I can run reliably @96kHz/p64 turning it off:
amixer -c X cset numid=22 0 (where X is your alsa card number)

BTW how do you setup irq priorities ?

Thomas
Received on Thu Jun 23 12:15:10 2005