linux-kernel - Re: PEBS bug on HSW: "Unexpected number of pebs records 10" (was: Re: [GIT PULL] perf changes for v3.12)

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Message-ID: <CAMsRxfLn7D-ON=gfrxttA5okPg=pyB_a-hHMBPVwGgO1_yHXYQ@mail.gmail.com>
Date:	Tue, 10 Sep 2013 05:55:35 -0700
From:	Stephane Eranian <eranian@...glemail.com>
To:	Ramkumar Ramachandra <artagnon@...il.com>
Cc:	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andi Kleen <andi@...stfloor.org>
Subject: Re: PEBS bug on HSW: "Unexpected number of pebs records 10" (was: Re:
 [GIT PULL] perf changes for v3.12)

On Tue, Sep 10, 2013 at 5:51 AM, Ramkumar Ramachandra
<artagnon@...il.com> wrote:
> Stephane Eranian wrote:
>> a simple multithreaded program where
>> #threads >> #CPUs
>
> To put it another way, does Intel's HT work for CPU intensive and IO
> minimal tasks? I think HT assumes some amount of inefficient IO
> coupled with pure CPU usage.

But your remark has nothing to do with the PMU issue.
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