From: Lukas Hejtmanek <xhejtman@ics.muni.cz>
To: "Jun'ichi Nomura" <j-nomura@ce.jp.nec.com>
Cc: Mike Snitzer <snitzer@redhat.com>,
Kiyoshi Ueda <k-ueda@ct.jp.nec.com>,
agk@redhat.com, linux-kernel@vger.kernel.org
Subject: Re: request baset device mapper in Linux
Date: Thu, 29 Sep 2011 22:57:48 +0200 [thread overview]
Message-ID: <20110929205748.GX19004@ics.muni.cz> (raw)
In-Reply-To: <4E76D810.6010504@ce.jp.nec.com>
On Mon, Sep 19, 2011 at 02:50:08PM +0900, Jun'ichi Nomura wrote:
> 2.6.32.36
> no-multipath: 2.8 GB/s
> multipath: 600 MB/s
> multipath w/ patch: 2.8-2.9 GB/s
>
> 3.0.3
> no-multipath: ??
> multipath: 2.5 GB/s
> multipath w/ patch: 2.5 GB/s(?)
>
> Have you tried 3.0.3 without multipath?
yes, 3GB/s and only kwapd0 and kswapd1 is running, no kworker or ksoftirqd..
> > top looks like this:
> > 63 root 20 0 0 0 0 S 38 0.0 0:16.65 kswapd1
> > 18 root 20 0 0 0 0 R 32 0.0 0:14.38 kworker/4:0
> > 19 root 20 0 0 0 0 R 30 0.0 0:20.88 ksoftirqd/4
> > 153 root 20 0 0 0 0 R 29 0.0 0:14.46 kworker/4:2
> > 62 root 20 0 0 0 0 S 22 0.0 0:09.44 kswapd0
>
> dm-multipath itself does not use workqueue for normal I/Os.
> So you might be hitting a different problem.
--
Lukáš Hejtmánek
next prev parent reply other threads:[~2011-09-29 20:58 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-07-20 8:26 Lukas Hejtmanek
2011-07-21 11:11 ` Kiyoshi Ueda
2011-07-21 13:26 ` Lukas Hejtmanek
2011-07-22 6:56 ` Kiyoshi Ueda
2011-07-22 8:19 ` Lukas Hejtmanek
2011-07-23 7:28 ` Jun'ichi Nomura
2011-07-24 22:16 ` Lukas Hejtmanek
2011-08-01 9:31 ` Kiyoshi Ueda
2011-09-08 13:27 ` Lukas Hejtmanek
2011-09-15 18:49 ` Mike Snitzer
2011-09-16 14:08 ` Lukas Hejtmanek
2011-09-19 5:50 ` Jun'ichi Nomura
2011-09-29 20:57 ` Lukas Hejtmanek [this message]
2011-10-05 8:13 ` Jun'ichi Nomura
2011-10-05 10:35 ` Lukas Hejtmanek
2011-10-06 5:11 ` Jun'ichi Nomura
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