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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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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