linux-kernel - Re: konqueror deadlocks on 2.6.22

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Date:	Sun, 20 Jan 2008 08:41:56 +0300
From:	Al Boldi <a1426z@...ab.com>
To:	Mike Galbraith <efault@....de>
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: konqueror deadlocks on 2.6.22

Mike Galbraith wrote:
> On Sat, 2008-01-19 at 21:14 +0300, Al Boldi wrote:
> > I was just attacked by some deadlock issue involving sqlite3 and
> > konqueror. While sqlite3 continues to slowly fill a 7M-record db in
> > transaction mode, konqueror hangs for a few minutes, then continues only
> > to hang again and again.
> >
> > Looks like an fs/blockIO issue involving fsync.
> >
> > As a workaround, is there a way to make fsync soft?
>
> Do you have the fs mounted data=writeback?  A while back, I ran into
> starvation on the order of minutes with my old/full ext2 fs until
> mounting data=writeback.

You are absolutely right.  With data=writeback the hangs completely 
disappear, and sqlite3 insert performance increases 10x fold.

Now data=writeback is known to be faster than data=ordered, but a 10x fold 
increase probably points to some sync contention within the data=ordered 
logic.  Any ideas how this could be fixed?


Thanks a lot!

BTW Mike: Your server bounces my messages.

--
Al


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