Thomas Charbonnel <thomas@xxxxxxxxxx> writes: > 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). I just found out it works at -r96000 -p128, totally reliably without any xruns. Since that is effectively the same latency as -r48000 -p64 (I think so, right?), I think I can live with that. > 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) What are the downsides of turning "Precise Pointer" off? > BTW how do you setup irq priorities ? chrt -p 98 `pidof "IRQ 201"` -- Thanks, Mario
