Messages in this thread | | | Subject | Re: [patch] voluntary-preempt-2.6.8-rc2-M5 | From | Thomas Charbonnel <> | Date | Sun, 01 Aug 2004 18:16:41 +0200 |
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Ingo Molnar wrote : > i've uploaded the latest version of the voluntary-preempt patch: > > http://redhat.com/~mingo/voluntary-preempt/voluntary-preempt-2.6.8-rc2-M5 >
This patch doesn't solve the latency spikes I see every ~8 seconds on my system. They still appear in latencytest when the rtc interrupt is the only non threaded interrupt on the system, and they still produce xruns in jack in conjunction with the keyboard even if the the sound card's interrupt is the only non threaded irq and jack's SCHED_FIFO priority is higher than the irq threads. I suspected a clock issue and switched from tsc to pmtmr without success. I now suspect a hardware issue (the machine is a laptop with a PIII M 1GHz cpu) or a scheduler corner case. Running jack at 96000Hz with 2 periods of 64 samples, I can see regular bursts of cpu usage every 2 or 3 seconds. Oprofile reveals that schedule is then the second most CPU intensive function on the system.
Thomas
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