From: Simon Kirby <sim@hostway.ca>
To: linux-btrace@vger.kernel.org
Subject: lots of unplugged by timer normal or abnormal?
Date: Tue, 06 Oct 2009 18:53:37 +0000 [thread overview]
Message-ID: <20091006185337.GF26949@hostway.ca> (raw)
Hello,
I was just testing out blktrace/blkparse/btrace on a box that is hitting
some performance walls, and noticed that there are a fair amonut of "UT"
events (unplug by timer). Is this normal/expected? For example:
[sroot@nas04:/root]# btrace /dev/etherd/e7.0 | grep T
152,32 4 1379 3.582513494 0 UT N [swapper] 8
152,32 1 1289 4.329760067 0 UT N [swapper] 1
152,32 3 1132 4.362257911 0 UT N [swapper] 3
152,32 7 1070 4.375258374 0 UT N [swapper] 1
152,32 3 1146 4.382260172 0 UT N [swapper] 5
152,32 1 1318 4.417759727 2830 UT N [nfsd] 3
152,32 5 1003 4.498757105 0 UT N [swapper] 1
152,32 1 1368 4.517761127 0 UT N [swapper] 1
152,32 0 1133 4.585522116 0 UT N [swapper] 5
This is on 2.6.30.5 with the 2.6.30.6 XFS patches.
Cheers,
Simon-
next reply other threads:[~2009-10-06 18:53 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-10-06 18:53 Simon Kirby [this message]
2009-10-06 19:50 ` lots of unplugged by timer normal or abnormal? Alan D. Brunelle
2009-10-06 20:08 ` Simon Kirby
2009-10-06 20:20 ` Alan D. Brunelle
2009-10-11 16:44 ` Simon Kirby
2009-10-11 18:35 ` Jens Axboe
2009-10-11 20:58 ` Simon Kirby
2009-10-12 7:18 ` Jens Axboe
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