From: David Ahern <dsahern@gmail.com>
To: "Pádraig Brady" <P@draigBrady.com>
Cc: linux-perf-users@vger.kernel.org
Subject: Re: PEBS availability
Date: Tue, 24 May 2011 11:26:09 -0600 [thread overview]
Message-ID: <4DDBEA31.9070409@gmail.com> (raw)
In-Reply-To: <4DDBD387.2070906@draigBrady.com>
On 05/24/11 09:49, Pádraig Brady wrote:
> Hi,
>
> I've just got a shiny new i3-2310M and am a
> bit surprised that `perf` isn't listing
> detailed stats like L1 cache misses etc.
'perf list | grep Hardware' will show you counters recognized by perf
(perhaps with F15, "perf list hw" works). You can add more counters
using the -e option.
You might also want to try 2.6.39 kernel and upstream version of perf.
Ingo added a number of default counters to perf stat.
David
>
> $ perf stat true
>
> Performance counter stats for 'true':
>
> 1,239 cache-misses # 1.555 M/sec
> 9,314 cache-references # 11.693 M/sec
> 3,940 branch-misses # 4.871 %
> 80,885 branches # 101.546 M/sec
> 403,808 instructions # 0.000 IPC
> <not counted> cycles
> 81 page-faults # 0.102 M/sec
> 0 CPU-migrations # 0.000 M/sec
> 1 context-switches # 0.001 M/sec
> 0.796537 task-clock-msecs # 0.032 CPUs
>
> 0.024654938 seconds time elapsed
>
> I searched for a while but found it _very_ difficult
> to find info on what was available on particular intel CPUs.
>
> I did see in the "Nehalem Core PMU programming guide":
> http://software.intel.com/file/30320
> that the above stats are core features and that the other
> counters I mentioned are PEBS (Precise Event Based Sampling)
> and are not available on all systems.
>
> So am I out of look with my new i3 sandy bridge CPU?
> Are PEBS restricted to i7 versions only?
> Is this documented anywhere?
>
> Maybe I need some kernel support as hinted at by:
> http://lwn.net/Articles/430100/
> My kernel is 2.6.38.6-27.fc15.x86_64
>
> cheers.
> Pádraig.
> --
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next prev parent reply other threads:[~2011-05-24 17:26 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-05-24 15:49 PEBS availability Pádraig Brady
2011-05-24 17:26 ` David Ahern [this message]
2011-05-24 20:37 ` Arun Sharma
2011-05-25 8:33 ` Pádraig Brady
2011-05-27 10:13 ` Pádraig Brady
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