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Re: xfssyncd syncing every five seconds?

To: Karol Kozimor <sziwan@xxxxxxxxxxx>
Subject: Re: xfssyncd syncing every five seconds?
From: Steve Lord <lord@xxxxxxx>
Date: 22 Sep 2003 14:29:50 -0500
Cc: Simon Matter <simon.matter@xxxxxxxxxxxxxxxx>, Nathan Scott <nathans@xxxxxxx>, Jeremy Field <jezza@xxxxxxxxx>, linux-xfs@xxxxxxxxxxx
In-reply-to: <20030921122137.GA10010@xxxxxxxxxxx>
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On Sun, 2003-09-21 at 07:21, Karol Kozimor wrote:
> Thus wrote Steve Lord:
> > I could gripe about folks reporting this after the release, rather
> > than before it... I just logged into my workstation from home, and
> > watched it for a minute or two, zero I/O during this time. On the
> > other hand, my laptop does appear to be doing periodic I/O and it
> > does seem to be every 5 seconds. I have also had a report of someone
> > not being able to keep their disks spun down in 2.6 on a laptop.
> > 
> > Scratching my head so far, 5 seconds does not really tie up with
> > any xfs thread.
> 
> Please do search for laptop-mode patches published on lkml several times.
> They have a sysctl setting that, when turned on, dumps the processes or
> threads doing I/O on screen. Using that patch, I was able to successfully
> spin my disk down to about 1 minute (the maximum sysctl setting for
> xfssyncd or the other).
> Best regards,

Using a current CVS kernel, and redhat 9.0 user space, I can get
my laptop to sit there with a suspended ide drive for 10 minutes
before something pops off and writes to a log file. I mounted all
filesystems with noatime and stopped crond.

Steve

-- 

Steve Lord                                      voice: +1-651-683-3511
Principal Engineer, Filesystem Software         email: lord@xxxxxxx


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