linux-kernel - RE: Discrepancies between Oprofile and vmstat II

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Message-ID: <D7C42C27E6CB1E4D8CBDF2F81EA92A260345987850@azsmsx501.amr.corp.intel.com>
Date:	Mon, 27 Apr 2009 15:35:57 -0700
From:	"Styner, Douglas W" <douglas.w.styner@...el.com>
To:	Andi Kleen <andi@...stfloor.org>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"oprofile-list@...ts.sf.net" <oprofile-list@...ts.sf.net>,
	"Ma, Chinang" <chinang.ma@...el.com>,
	"willy@...ux.intel.com" <willy@...ux.intel.com>
Subject: RE: Discrepancies between Oprofile and vmstat II

>
>You mean "with higher value", right ?

Right.  Higher number of samples; lower count value.  I'm going to try it the other way as well (count value = 200000)

>
>It's still strange that it suddenly changed in 2.6.27 though. There
>shouldn't have been
>a difference there. So I still think it's a regression.
>

We only first saw it in 2.6.27.  It is possible that it goes back to 2.6.26 or 2.6.25.  We have not confirmed those kernels.

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