linux-kernel - Re: 2.6.24-rc3-mm1 (sync is slow ?)

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Message-Id: <20071121174948.2269d02f.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Wed, 21 Nov 2007 17:49:48 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: 2.6.24-rc3-mm1 (sync is slow ?)

On Wed, 21 Nov 2007 17:42:15 +0900
KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> wrote:

> Hi, Andrew
> 
> I got following result in 'sync' command.
> It was too slow. (memory controller config is off ;)
> I attaches my .config.
> ==
> [2.6.24-rc3-mm1]
> [kamezawa@...test2 ~]$ dd if=/dev/zero of=./tmpfile bs=4096 count=100000
> 100000+0 records in
> 100000+0 records out
> 409600000 bytes (410 MB) copied, 1.46706 seconds, 279 MB/s
> [kamezawa@...test2 ~]$ time sync
> 
> real    3m6.440s
> user    0m0.000s
> sys     0m0.133s
> 
Ah, one of cpu shows 100% iowait in 'top' command while this.

-Kame

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