Messages in this thread | | | Subject | Re: [patch] voluntary-preempt-2.6.9-rc1-bk4-Q5 | From | Thomas Charbonnel <> | Date | Tue, 31 Aug 2004 21:45:08 +0200 |
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Ingo Molnar wrote : > * Thomas Charbonnel <thomas@undata.org> wrote: > > > As you can see ~1ms was probably an accident, and the latency does not > > always come from do_timer. The constant is do_IRQ interrupting the > > idle thread. > > (do you have any sort of powersaving mode (ACPI/APM) enabled? If yes, > could you try to tune it down as much as possible - disable any > powersaving option in the BIOS and in the .config - kill apmd, etc.) > > but i dont think it's powersaving - why would such an overhead show up > in those functions. The only common thing seems to be that both > mark_offset_tsc() and mask_and_ack_8259A() does port IO, which is slow - > but still it shouldnt take ~0.5 msecs! > > Ingo
Indeed, I just checked and my xrun every ~8 seconds problem is back. I have acpi compiled in but acpi=off, but it doesn't seem to be honoured (it was with 2.6.8.1, IIRC).
Thomas
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