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Open Source and information security mailing list archives
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Date: Sat, 13 Oct 2007 09:18:58 +0200 From: Mike Galbraith <efault@....de> To: Peter Zijlstra <a.p.zijlstra@...llo.nl> Cc: linux-kernel <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de> Subject: Re: [PATCH] sched: high-res preemption tick On Fri, 2007-10-12 at 22:51 +0200, Peter Zijlstra wrote: > Subject: sched: high-res preemption tick > > Use HR-timers (when available) to deliver an accurate preemption tick. This patch further reduced iperf context switching, and boosted throughput. iperf -c localhost -P 10 -t 300 Previously reported numbers 2.6.23-smp [SUM] 0.0-300.0 sec 153 GBytes 4.39 Gbits/sec [SUM] 0.0-300.1 sec 148 GBytes 4.23 Gbits/sec [SUM] 0.0-300.0 sec 152 GBytes 4.36 Gbits/sec 2.6.23-smp-d (sched-devel) [SUM] 0.0-300.0 sec 173 GBytes 4.96 Gbits/sec [SUM] 0.0-300.1 sec 173 GBytes 4.96 Gbits/sec [SUM] 0.0-300.0 sec 172 GBytes 4.93 Gbits/sec Numbers from fresh pull today 2.6.23-smp-d-hrt (re-enable PREEMPT_RESTRICT) [SUM] 0.0-300.1 sec 181 GBytes 5.19 Gbits/sec [SUM] 0.0-300.0 sec 182 GBytes 5.22 Gbits/sec [SUM] 0.0-300.1 sec 182 GBytes 5.22 Gbits/sec 2.6.23-smp-d [SUM] 0.0-300.1 sec 174 GBytes 4.97 Gbits/sec [SUM] 0.0-300.1 sec 173 GBytes 4.95 Gbits/sec [SUM] 0.0-300.1 sec 173 GBytes 4.96 Gbits/sec - 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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