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

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Date:	Wed, 21 Nov 2007 17:42:15 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: 2.6.24-rc3-mm1 (sync is slow ?)

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

==
-Kame

Download attachment "myconfig" of type "application/octet-stream" (47498 bytes)