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Date: Fri, 16 Sep 2011 16:08:39 +0200
From: Lukas Hejtmanek <xhejtman@....muni.cz>
To: Mike Snitzer <snitzer@...hat.com>
Cc: Kiyoshi Ueda <k-ueda@...jp.nec.com>,
"Jun'ichi Nomura" <j-nomura@...jp.nec.com>, agk@...hat.com,
linux-kernel@...r.kernel.org
Subject: Re: request baset device mapper in Linux
On Thu, Sep 15, 2011 at 02:49:52PM -0400, Mike Snitzer wrote:
> Does "with your patch" mean against 3.0.3 or the original 2.6.32 kernel?
>
> If you apply the patch to the 3.0.3 kernel do you regain the performance?
Unfortunately, the patch does not help with 3.0.3 kernel
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
16726 root 20 0 9484 1628 588 D 11 0.0 0:03.94 dd
16721 root 20 0 9484 1628 588 D 11 0.0 0:03.87 dd
16723 root 20 0 9484 1624 588 D 11 0.0 0:04.02 dd
16725 root 20 0 9484 1628 588 D 11 0.0 0:03.89 dd
16727 root 20 0 9484 1628 588 D 11 0.0 0:03.91 dd
16728 root 20 0 9484 1624 588 D 11 0.0 0:03.89 dd
16729 root 20 0 9484 1624 588 D 11 0.0 0:03.89 dd
16724 root 20 0 9484 1624 588 D 11 0.0 0:03.93 dd
16674 root 20 0 9484 1624 588 R 6 0.0 0:01.99 dd
16685 root 20 0 9484 1624 588 D 6 0.0 0:02.00 dd
16654 root 20 0 9484 1628 588 D 5 0.0 0:01.55 dd
16662 root 20 0 9484 1588 588 D 5 0.0 0:01.53 dd
16665 root 20 0 9484 1628 588 D 5 0.0 0:01.57 dd
with patched 2.6.32, it looks like:
17330 root 20 0 9432 1752 616 D 4 0.0 0:00.34 dd
17335 root 20 0 9432 1756 616 D 4 0.0 0:00.35 dd
17316 root 20 0 9432 1756 616 D 4 0.0 0:00.34 dd
17318 root 20 0 9432 1756 616 D 4 0.0 0:00.34 dd
17322 root 20 0 9432 1756 616 D 4 0.0 0:00.34 dd
17323 root 20 0 9432 1756 616 D 4 0.0 0:00.33 dd
17324 root 20 0 9432 1756 616 D 4 0.0 0:00.34 dd
17325 root 20 0 9432 1756 616 D 4 0.0 0:00.34 dd
17326 root 20 0 9432 1756 616 D 4 0.0 0:00.33 dd
17327 root 20 0 9432 1756 616 D 4 0.0 0:00.34 dd
17328 root 20 0 9432 1756 616 D 4 0.0 0:00.34 dd
17329 root 20 0 9432 1756 616 D 4 0.0 0:00.34 dd
17333 root 20 0 9432 1756 616 D 4 0.0 0:00.34 dd
17336 root 20 0 9432 1756 616 D 4 0.0 0:00.35 dd
17344 root 20 0 9432 1756 616 D 4 0.0 0:00.32 dd
17317 root 20 0 9432 1756 616 D 4 0.0 0:00.33 dd
17319 root 20 0 9432 1752 616 D 4 0.0 0:00.34 dd
17320 root 20 0 9432 1756 616 D 4 0.0 0:00.33 dd
17321 root 20 0 9432 1756 616 D 4 0.0 0:00.33 dd
17331 root 20 0 9432 1756 616 R 4 0.0 0:00.33 dd
17332 root 20 0 9432 1756 616 D 4 0.0 0:00.34 dd
17334 root 20 0 9432 1756 616 D 4 0.0 0:00.34 dd
unpatched 2.6.32 looks like:
4 root 20 0 0 0 0 R 100 0.0 0:25.60 ksoftirqd/0
19325 root 20 0 9432 1756 616 D 48 0.0 0:12.51 dd
19294 root 20 0 9432 1756 616 D 11 0.0 0:01.09 dd
19323 root 20 0 9432 1756 616 D 4 0.0 0:01.02 dd
19295 root 20 0 9432 1756 616 D 2 0.0 0:02.73 dd
19305 root 20 0 9432 1756 616 D 2 0.0 0:00.53 dd
19327 root 20 0 9432 1760 616 D 2 0.0 0:00.65 dd
19328 root 20 0 9432 1752 616 D 2 0.0 0:00.60 dd
19336 root 20 0 9432 1752 616 D 2 0.0 0:00.49 dd
19350 root 20 0 9432 1756 616 D 2 0.0 0:00.55 dd
19366 root 20 0 9432 1752 616 D 2 0.0 0:00.50 dd
19292 root 20 0 9432 1756 616 D 2 0.0 0:00.65 dd
19300 root 20 0 9432 1756 616 D 2 0.0 0:00.51 dd
19303 root 20 0 9432 1752 616 D 2 0.0 0:00.59 dd
19307 root 20 0 9432 1756 616 D 2 0.0 0:00.71 dd
19318 root 20 0 9432 1756 616 R 2 0.0 0:00.46 dd
19321 root 20 0 9432 1756 616 D 2 0.0 0:00.47 dd
19332 root 20 0 9432 1756 616 D 2 0.0 0:00.49 dd
19334 root 20 0 9432 1760 616 D 2 0.0 0:00.49 dd
19339 root 20 0 9432 1756 616 D 2 0.0 0:00.47 dd
19348 root 20 0 9432 1756 616 D 2 0.0 0:00.48 dd
19355 root 20 0 9432 1756 616 D 2 0.0 0:00.47 dd
--
Lukáš Hejtmánek
--
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