From: Andi Kleen <ak@suse.de>
To: Voluspa <lista1@comhem.se>
Cc: akpm@osdl.org, Valdis.Kletnieks@vt.edu, diegocg@gmail.com,
linux-kernel@vger.kernel.org, wfg@mail.ustc.edu.cn
Subject: Re: adaptive readahead overheads
Date: 08 Jun 2006 15:05:38 +0200 [thread overview]
Message-ID: <p73ac8nu7a5.fsf@verdi.suse.de> (raw)
In-Reply-To: <20060608142556.2e10e379.lista1@comhem.se>
Voluspa <lista1@comhem.se> writes:
> On Thu, 8 Jun 2006 19:37:31 +0800 Fengguang Wu wrote:
> > I'd like to show some numbers on the pure software overheads come with
> > the adaptive readahead in daily operations.
> [...]
> >
> > # time find /usr -type f -exec md5sum {} \; >/dev/null
> >
> > ARA
> >
> > 406.00s user 325.16s system 97% cpu 12:28.17 total
>
> Just out of interest, all your figures show an almost maxed out CPU.
It might be because qemu has a poor IO model (old IDE) that is quite
CPU intensive to drive.
-Andi
next prev parent reply other threads:[~2006-06-08 13:05 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-05-30 3:36 Adaptive Readahead V14 - statistics question Voluspa
[not found] ` <20060530064026.GA4950@mail.ustc.edu.cn>
2006-05-30 6:40 ` Wu Fengguang
2006-05-30 16:49 ` Valdis.Kletnieks
2006-05-31 21:06 ` Diego Calleja
2006-05-31 21:50 ` Voluspa
[not found] ` <20060601055143.GA5216@mail.ustc.edu.cn>
2006-06-01 5:51 ` Fengguang Wu
2006-06-01 6:35 ` Voluspa
2006-06-08 8:04 ` Voluspa
[not found] ` <20060608113731.GA5813@mail.ustc.edu.cn>
2006-06-08 11:37 ` adaptive readahead overheads Fengguang Wu
2006-06-08 12:25 ` Voluspa
[not found] ` <20060608123900.GA6885@mail.ustc.edu.cn>
2006-06-08 12:39 ` Fengguang Wu
2006-06-08 13:05 ` Andi Kleen [this message]
2006-06-08 14:00 ` Jens Axboe
[not found] ` <448493E9.9030203@samwel.tk>
[not found] ` <20060606033436.GB6071@mail.ustc.edu.cn>
2006-06-06 3:34 ` Adaptive Readahead V14 - statistics question Wu Fengguang
[not found] <20060604073415.GB5405@mail.ustc.edu.cn>
2006-06-04 7:34 ` [PATCH] readahead: initial method - expected read size - fix fastcall Fengguang Wu
2006-06-04 9:07 ` Andrew Morton
2006-06-04 9:25 ` Arjan van de Ven
2006-06-05 1:17 ` Voluspa
2006-06-05 8:00 ` Arjan van de Ven
[not found] ` <20060606022606.GA6071@mail.ustc.edu.cn>
2006-06-06 2:26 ` Fengguang Wu
2006-06-08 7:31 ` Voluspa
[not found] ` <20060608075722.GA5515@mail.ustc.edu.cn>
2006-06-08 7:57 ` Fengguang Wu
[not found] ` <20060606025728.GA6365@mail.ustc.edu.cn>
2006-06-06 2:57 ` Fengguang Wu
2006-06-08 7:43 ` Voluspa
[not found] ` <20060608081352.GB5515@mail.ustc.edu.cn>
2006-06-08 8:13 ` Fengguang Wu
2006-06-08 8:28 ` Voluspa
[not found] ` <20060608085055.GA5917@mail.ustc.edu.cn>
2006-06-08 8:50 ` Fengguang Wu
2006-06-08 10:04 ` Voluspa
[not found] ` <20060604121328.GA6686@mail.ustc.edu.cn>
2006-06-04 12:13 ` [PATCH] readahead: call scheme - fix fastcall readahead_cache_hit() Fengguang Wu
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