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SubjectRe: 2.6.24-rc3-mm1 (sync is slow ?)
On Wed, 21 Nov 2007 00:49:09 -0800
Andrew Morton <akpm@linux-foundation.org> wrote:

> 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

> Well I wonder how we did that.
>
> It seems OK here from a quick test (i386, ext3-on-IDE).
>
> Maybe device driver/block breakage?
>

I confirmed This slowdown is caused by git-scsi-misc.patch.
I'm sorry that I can't chase more and will be offline in this weekend.

This is scsi_mod information in /proc/modules
=
scsi_mod 409416 8 mptctl,sg,lpfc,scsi_transport_fc,mptspi,mptscsih,scsi_transport_spi,sd_mod, Live 0xa000000202818000
=

What information should I provide more ?

Thanks,
-Kame


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