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: <CALkWK0k3pJKXCsO6Nn6arm9TZCUazNdW_HrVvsa3XNnh2T8WMA@mail.gmail.com>
Date:	Tue, 10 Sep 2013 18:21:00 +0530
From:	Ramkumar Ramachandra <artagnon@...il.com>
To:	eranian@...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)

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.
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