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Date: Wed, 19 Jun 2013 21:58:22 +0200 From: Oleg Nesterov <oleg@...hat.com> To: David Ahern <dsahern@...il.com> Cc: Peter Zijlstra <peterz@...radead.org>, Steven Rostedt <rostedt@...dmis.org>, Frederic Weisbecker <fweisbec@...il.com>, Ingo Molnar <mingo@...hat.com>, Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>, Srikar Dronamraju <srikar@...ux.vnet.ibm.com>, "zhangwei(Jovi)" <jovi.zhangwei@...wei.com>, linux-kernel@...r.kernel.org Subject: Re: [PATCH 0/3] tracing/perf: perf_trace_buf/perf_xxx hacks. On 06/19, David Ahern wrote: > > On 6/19/13 11:51 AM, Oleg Nesterov wrote: >> >> not sure these numbers actually mean >> something, but still. Yes. >> So, the test-case: >> >> int pipe1[2], pipe2[2]; > > Same as "perf bench sched pipe" You just cruelly disclosed the fact that I do not use perf. Thanks. So, # perf record -e sched:sched_switch -p1 & [1] 516 # perf bench sched pipe 3 times. before: Total time: 30.119 [sec] 30.119501 usecs/op 33201 ops/sec Total time: 30.634 [sec] 30.634105 usecs/op 32643 ops/sec Total time: 30.100 [sec] 30.100209 usecs/op 33222 ops/sec after: Total time: 29.645 [sec] 29.645941 usecs/op 33731 ops/sec Total time: 29.759 [sec] 29.759075 usecs/op 33603 ops/sec Total time: 29.803 [sec] 29.803522 usecs/op 33553 ops/sec Hmm. Actually sched-pipe.c is a bit more "heavy", it does switch_mm(). And I used taskset. But it seems that this test-case shows the similar results. Oleg. -- 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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