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Message-Id: <20071121004909.6157bb9a.akpm@linux-foundation.org>
Date: Wed, 21 Nov 2007 00:49:09 -0800
From: Andrew Morton <akpm@...ux-foundation.org>
To: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc: 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
>
>
> on, 2.6.23-rc2-mm1, 2.6.23-rc3 there was no problem.
> ==
> [2.6.24-rc3]
> [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, 2.07717 seconds, 197 MB/s
> [kamezawa@...test2 ~]$ time sync
>
> real 0m9.935s
> user 0m0.001s
> sys 0m0.113s
>
> [2.6.24-rc3]
> [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, 1.37147 seconds, 299 MB/s
> [kamezawa@...test2 ~]$ time sync[2.6.24-rc2-mm1]
>
>
> real 0m11.718s
> user 0m0.000s
> sys 0m0.138s
Well I wonder how we did that.
It seems OK here from a quick test (i386, ext3-on-IDE).
Maybe device driver/block breakage?
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