linux-kernel - Re: request baset device mapper in Linux

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Message-ID: <20110929205748.GX19004@ics.muni.cz>
Date:	Thu, 29 Sep 2011 22:57:48 +0200
From:	Lukas Hejtmanek <xhejtman@....muni.cz>
To:	"Jun'ichi Nomura" <j-nomura@...jp.nec.com>
Cc:	Mike Snitzer <snitzer@...hat.com>,
	Kiyoshi Ueda <k-ueda@...jp.nec.com>, agk@...hat.com,
	linux-kernel@...r.kernel.org
Subject: Re: request baset device mapper in Linux

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
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