linux-kernel - Re: power increase issue on light load

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Date:	Wed, 29 Jun 2011 17:26:12 -0700
From:	Nikhil Rao <ncrao@...gle.com>
To:	"Alex,Shi" <alex.shi@...el.com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	"mingo@...e.hu" <mingo@...e.hu>,
	"Chen, Tim C" <tim.c.chen@...el.com>,
	"Li, Shaohua" <shaohua.li@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Brown, Len" <len.brown@...el.com>
Subject: Re: power increase issue on light load

On Tue, Jun 28, 2011 at 11:55 PM, Alex,Shi <alex.shi@...el.com> wrote:
>> > - Would it be possible to get a "perf sched" trace on these two kernels?
>
> I tried the 'perf sched record' and then 'perf sched trace' as usage
> show. but in fact, the 'perf sched' doesn't support 'trace' command now.

I believe this was renamed to "perf script" in
133dc4c39c57eeef2577ca5b4ed24765b7a78ce2.

> since the 'perf sched record' is using 'perf record -e sched:xxx' to do
> record. I used 'perf record' directly. The follow info collected in 300'
> on my NHM-EP for benchmark bltk-office.
>
> [alexs@...-ne01 ~]$ grep -e Events.*sched
> linux-2.6/perf-report-3.0.0-rc5
> # Events: 11K sched:sched_wakeup
> # Events: 1K sched:sched_wakeup_new
> # Events: 24K sched:sched_switch
> # Events: 3K sched:sched_migrate_task
> # Events: 851  sched:sched_process_free
> # Events: 1K sched:sched_process_exit
> # Events: 1K sched:sched_process_wait
> # Events: 1K sched:sched_process_fork
> # Events: 12K sched:sched_stat_wait
> # Events: 9K sched:sched_stat_sleep
> # Events: 452  sched:sched_stat_iowait
> # Events: 16K sched:sched_stat_runtime
> [alexs@...-ne01 ~]$
> [alexs@...-ne01 ~]$
> [alexs@...-ne01 ~]$ grep -e
> Events.*sched /mnt/linux-2.6.39/perf-report-2.6.39
> # Events: 5K sched:sched_wakeup
> # Events: 615  sched:sched_wakeup_new
> # Events: 11K sched:sched_switch
> # Events: 2K sched:sched_migrate_task
> # Events: 541  sched:sched_process_free
> # Events: 692  sched:sched_process_exit
> # Events: 1K sched:sched_process_wait
> # Events: 615  sched:sched_process_fork
> # Events: 6K sched:sched_stat_wait
> # Events: 4K sched:sched_stat_sleep
> # Events: 178  sched:sched_stat_iowait
> # Events: 9K sched:sched_stat_runtime
>
>

Thanks for the data but these raw counts are not very useful. Can you
please send either the binary file or the ascii trace output for the
two kernels? Also -- a 300s trace might be too much; about 30s should
be sufficient.

-Thanks,
Nikhil
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