From: Andi Kleen <andi@firstfloor.org>
To: "Styner, Douglas W" <douglas.w.styner@intel.com>
Cc: Andi Kleen <andi@firstfloor.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"oprofile-list@lists.sf.net" <oprofile-list@lists.sf.net>,
"Ma, Chinang" <chinang.ma@intel.com>,
"willy@linux.intel.com" <willy@linux.intel.com>
Subject: Re: Discrepancies between Oprofile and vmstat II
Date: Tue, 28 Apr 2009 00:22:42 +0200 [thread overview]
Message-ID: <20090427222242.GJ27382@one.firstfloor.org> (raw)
In-Reply-To: <D7C42C27E6CB1E4D8CBDF2F81EA92A2603459877BD@azsmsx501.amr.corp.intel.com>
On Mon, Apr 27, 2009 at 03:15:27PM -0700, Styner, Douglas W wrote:
>
> > I believe so, but will confirm.
> >
> > > opcontrol -e=CPU_CLK_UNHALTED:80000 -e=LLC_MISSES:6000
> > >
> > > Using another profiling tool to confirm, we see 74.784% user, 25.174% > > kernel.
> >
> > Just verifying -- you also see it when you use a shorter period than 80000 > right?
>
> Confirmed. Changes in profile appear to be due to increased sampling by oprofile with lower value.
You mean "with higher value", right ?
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.
-Andi
next prev parent reply other threads:[~2009-04-27 22:18 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-04-23 16:49 Mainline kernel OLTP performance update Styner, Douglas W
2009-04-27 7:02 ` Andi Kleen
2009-04-27 18:38 ` Discrepancies between Oprofile and vmstat Styner, Douglas W
2009-04-27 18:49 ` Andi Kleen
2009-04-27 18:53 ` Discrepancies between Oprofile and vmstat II Andi Kleen
2009-04-27 18:51 ` Styner, Douglas W
2009-04-27 22:15 ` Styner, Douglas W
2009-04-27 22:22 ` Andi Kleen [this message]
2009-04-27 22:35 ` Styner, Douglas W
2009-04-28 5:26 ` Eric Dumazet
2009-04-28 16:57 ` Mainline kernel OLTP performance update Chuck Ebbert
2009-04-28 17:15 ` James Bottomley
2009-04-28 17:17 ` Styner, Douglas W
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