From: Artem Bokhan <aptem@ngs.ru>
To: Mark Lord <liml@rtr.ca>, Tejun Heo <htejun@gmail.com>,
linux-ide@vger.kernel.org
Subject: Re: [PATCH #upstream-fixes] sata_mv: don't issue two DMA commands concurrently
Date: Thu, 14 Aug 2008 14:42:55 +0700 [thread overview]
Message-ID: <48A3E1FF.4030502@ngs.ru> (raw)
In-Reply-To: <48A36FE5.5000706@rtr.ca>
Mark Lord пишет:
>
> I only see two failures (eg. one retry) in the log you showed.
Yes, I mean 2 tries, so 1 unnecessary rerty.
> But it probably was not a retry, but rather a second I/O after
> the first one. The filesystem layer often does that.
>
If kernel tries to read the same sector more then one time, I call that
retry :)
I found that it depend on vm someway... First 'dd if=/dev/sdb
of=/dev/null skip=300000 count=1' causes 2 failures (1 retry), but next
'dd's only 1failure. After I drop vm cache 'sysctl vm.drop_caches=1', I
get two failures again.
running 'dd if=/dev/sdb of=/dev/null skip=300000 count=1 iflag=direct'
always causes only 1 failure
IMHO, looks like cavity somewhere... Any ideas?
> Cheers
next prev parent reply other threads:[~2008-08-14 7:42 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-08-08 10:02 bad sectors, suspicious behaviour Artem Bokhan
2008-08-08 13:34 ` Mark Lord
2008-08-08 13:50 ` Mark Lord
2008-08-08 14:14 ` Mark Lord
2008-08-11 11:12 ` Bokhan Artem
2008-08-13 8:40 ` Tejun Heo
2008-08-13 10:47 ` Artem Bokhan
2008-08-13 10:50 ` Tejun Heo
2008-08-13 11:19 ` Artem Bokhan
2008-08-13 11:24 ` [PATCH #upstream-fixes] sata_mv: don't issue two DMA commands concurrently Tejun Heo
2008-08-13 11:37 ` Artem Bokhan
2008-08-13 11:52 ` Tejun Heo
2008-08-13 12:05 ` Artem Bokhan
2008-08-13 12:21 ` Tejun Heo
2008-08-13 12:32 ` Artem Bokhan
2008-08-13 16:17 ` Mark Lord
2008-08-13 17:37 ` Bokhan Artem
2008-08-13 19:58 ` Bokhan Artem
2008-08-13 23:36 ` Mark Lord
2008-08-14 7:42 ` Artem Bokhan [this message]
2008-08-14 12:40 ` Mark Lord
2008-08-14 12:58 ` Artem Bokhan
2008-08-14 13:17 ` Artem Bokhan
2008-08-14 19:49 ` Mark Lord
2008-08-15 5:35 ` Artem Bokhan
2008-08-15 12:27 ` Mark Lord
2008-08-13 16:57 ` Greg Freemyer
2008-08-13 17:29 ` Bokhan Artem
2008-08-13 17:50 ` Greg Freemyer
2008-08-13 18:04 ` Bokhan Artem
2008-08-13 18:13 ` Greg Freemyer
2008-08-13 11:47 ` Artem Bokhan
2008-08-13 11:52 ` Tejun Heo
2008-08-22 16:28 ` Grant Grundler
2008-08-13 16:10 ` Mark Lord
2008-08-22 6:11 ` Jeff Garzik
2008-08-22 17:01 ` Martin Michlmayr
2008-08-26 13:54 ` Mark Lord
2008-08-29 7:12 ` Martin Michlmayr
2008-08-26 1:24 ` Gwendal Grignou
2008-08-26 7:04 ` Tejun Heo
2008-08-26 13:58 ` Mark Lord
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