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Message-ID: <20070402093740.GA10091@elte.hu> Date: Mon, 2 Apr 2007 11:37:40 +0200 From: Ingo Molnar <mingo@...e.hu> To: Dave Sperry <dave_sperry@...e.org> Cc: linux-rt-users@...r.kernel.org, linux-kernel@...r.kernel.org Subject: Re: Poor UDP performance using 2.6.21-rc5-rt5 * Dave Sperry <dave_sperry@...e.org> wrote: > I checked the clock source and in both the vanilla and rt cases and > they were both acpi_pm ok, thanks for double-checking that. > Here's the oprofile for my vanilla case: i tried your workload and i think i managed to optimize it some more: i have uploaded the -rt8 kernel with these improvements included - could you try it? Is there any measurable improvement relative to -rt5? one more thing to improve netperf performance is to do this before running it: chrt -f -p 50 $$ this will put netperf on the same priority level as the net hardirq and the net softirq (which both default to SCHED_FIFO:50), and should result in a (much) reduced context-switch rate. Or, if networking is not latency-critical, then you could move the net hardirq and softirq threads to SCHED_BATCH, and run netperf under SCHED_BATCH as well, using: chrt -b -p 0 $$ and figuring out the active softirq hardirq thread PIDs and "chrt -b" -ing them too. Ingo - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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