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

KAMEZAWA Hiroyuki
2007-11-21T08:47:21Z

On Wed, 21 Nov 2007 17:42:15 +0900
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.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@dr-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@dr-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