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Date: Thu, 17 Sep 2009 09:21:17 +0200 From: Ingo Molnar <mingo@...e.hu> To: Mike Galbraith <efault@....de> Cc: Serge Belyshev <belyshev@...ni.sinp.msu.ru>, linux-kernel@...r.kernel.org, Peter Zijlstra <a.p.zijlstra@...llo.nl> Subject: Re: [patchlet] Re: Epic regression in throughput since v2.6.23 here's some start-debit versus non-start-debit numbers. The workload: on a dual-core box start and kill 10 loops, once every second. PID 23137 is a shell doing interactive stuff. (running a loop of usleep 100000 and echo) START_DEBIT: europe:~> perf sched lat | grep 23137 bash:23137 | 34.380 ms | 187 | avg: 0.005 ms | max: 0.017 ms | bash:23137 | 36.410 ms | 188 | avg: 0.005 ms | max: 0.011 ms | bash:23137 | 36.680 ms | 183 | avg: 0.007 ms | max: 0.333 ms | NO_START_DEBIT: europe:~> perf sched lat | grep 23137 bash:23137 | 35.531 ms | 183 | avg: 0.005 ms | max: 0.019 ms | bash:23137 | 35.511 ms | 188 | avg: 0.007 ms | max: 0.334 ms | bash:23137 | 35.774 ms | 185 | avg: 0.005 ms | max: 0.019 ms | Seems very similar at first sight. 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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