From: Chuck Ebbert <76306.1226@compuserve.com>
To: Andi Kleen <ak@suse.de>
Cc: linux-kernel <linux-kernel@vger.kernel.org>,
Andrew Morton <akpm@osdl.org>,
Stephane Eranian <eranian@hpl.hp.com>
Subject: Re: [PATCH 2/2] i386 TIF flags for debug regs and io bitmap in ctxsw
Date: Wed, 5 Jul 2006 07:44:52 -0400 [thread overview]
Message-ID: <200607050745_MC3-1-C42B-9936@compuserve.com> (raw)
In-Reply-To: <200607042347.00598.ak@suse.de>
On Tue, 4 Jul 2006 23:47:00 +0200, Andi Kleen wrote:
> > I get a 5-10% speedup in task switch times with this patch.
>
> That sounds too much. How did you measure it?
>
> Note that lmbench tends to be unstable for this.
I used lmbench's lat_ctx(8). According to its manpage, you can make
multiple runs and use the minimum, not the average.
And the gain may have been high because I tested on an old PII notebook
with small cache and slow memory.
--
Chuck
"You can't read a newspaper if you can't read." --George W. Bush
next reply other threads:[~2006-07-05 11:49 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-07-05 11:44 Chuck Ebbert [this message]
-- strict thread matches above, loose matches on Subject: below --
2006-07-04 21:19 Chuck Ebbert
2006-07-04 21:47 ` Andi Kleen
2006-07-04 21:45 ` Stephane Eranian
2006-07-04 21:51 ` Stephane Eranian
2006-07-04 7:29 Stephane Eranian
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