linux-kernel - Re: A unresponsive file system can hang all I/O in the system on linux-2.6.23-rc6 (dirty

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Message-Id: <1190970729.31636.29.camel@twins>
Date:	Fri, 28 Sep 2007 11:12:09 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Chakri n <chakriin5@...il.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-pm <linux-pm@...ts.linux-foundation.org>,
	lkml <linux-kernel@...r.kernel.org>, nfs@...ts.sourceforge.net
Subject: Re: A unresponsive file system can hang all I/O in the system on
	linux-2.6.23-rc6 (dirty_thresh problem?)

On Fri, 2007-09-28 at 02:01 -0700, Chakri n wrote:
> Thanks for explaining the adaptive logic.
> 
> > However other devices will at that moment try to maintain a limit of 0,
> > which ends up being similar to a sync mount.
> >
> > So they'll not get stuck, but they will be slow.
> >
> >
> 
> Sync should be ok, when the situation is bad like this and some one
> hijacked all the buffers.
> 
> But, I see my simple dd to write 10blocks on local disk never
> completes even after 10 minutes.
> 
> [root@h46 ~]# dd if=/dev/zero of=/tmp/x count=10
> 
> I think the process is completely stuck and is not progressing at all.
> 
> Is something going wrong in the calculations where it does not fall
> back to sync mode.

What kernel is that?


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