From: Andrew Morton <akpm@linux-foundation.org>
To: Jonathan Corbet <corbet@lwn.net>
Cc: Chakri n <chakriin5@gmail.com>,
linux-pm <linux-pm@lists.linux-foundation.org>,
nfs@lists.sourceforge.net, lkml <linux-kernel@vger.kernel.org>,
Peter Zijlstra <a.p.zijlstra@chello.nl>
Subject: Re: A unresponsive file system can hang all I/O in the system on linux-2.6.23-rc6 (dirty_thresh problem?)
Date: Fri, 28 Sep 2007 11:04:45 -0700 [thread overview]
Message-ID: <20070928110445.69e687c0.akpm@linux-foundation.org> (raw)
In-Reply-To: <10659.1190986132@lwn.net>
On Fri, 28 Sep 2007 07:28:52 -0600 corbet@lwn.net (Jonathan Corbet) wrote:
> Andrew wrote:
> > It's unrelated to the actual value of dirty_thresh: if the machine fills up
> > with dirty (or unstable) NFS pages then eventually new writers will block
> > until that condition clears.
> >
> > 2.4 doesn't have this problem at low levels of dirty data because 2.4
> > VFS/MM doesn't account for NFS pages at all.
>
> Is it really NFS-related? I was trying to back up my 2.6.23-rc8 system
> to an external USB drive the other day when something flaked and the
> drive fell off the bus. That, too, was sufficient to wedge the entire
> system, even though the only thing which needed the dead drive was one
> rsync process. It's kind of a bummer to have to hit the reset button
> after the failure of (what should be) a non-critical piece of hardware.
>
> Not that I have a fix to propose...:)
>
That's a USB bug, surely. What should happen is that the kernel attempts
writeback, gets an IO error and then your data gets lost.
next prev parent reply other threads:[~2007-09-28 18:04 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <92cbf19b0709272332s25684643odaade0e98cb3a1f4@mail.gmail.com>
2007-09-28 6:50 ` A unresponsive file system can hang all I/O in the system on linux-2.6.23-rc6 (dirty_thresh problem?) Andrew Morton
[not found] ` <20070927235034.ae7bd73d.akpm@linux-foundation.org>
2007-09-28 6:59 ` Peter Zijlstra
[not found] ` <1190962752.31636.15.camel@twins>
2007-09-28 8:27 ` Chakri n
[not found] ` <92cbf19b0709280127yba48b60wfe58e532944894ca@mail.gmail.com>
2007-09-28 8:40 ` Peter Zijlstra
[not found] ` <1190968800.31636.26.camel@twins>
2007-09-28 9:01 ` Chakri n
[not found] ` <92cbf19b0709280201o3778f945mf1d8d61cbb3d0558@mail.gmail.com>
2007-09-28 9:12 ` Peter Zijlstra
[not found] ` <1190970729.31636.29.camel@twins>
2007-09-28 9:20 ` Chakri n
[not found] ` <92cbf19b0709280220o7cdd4b1cua37a8776af68ac25@mail.gmail.com>
2007-09-28 9:23 ` Peter Zijlstra
[not found] ` <1190971419.31636.38.camel@twins>
2007-09-28 10:36 ` Chakri n
2007-09-28 13:28 ` Jonathan Corbet
[not found] ` <10659.1190986132@lwn.net>
2007-09-28 13:35 ` Peter Zijlstra
2007-09-28 18:04 ` Andrew Morton [this message]
[not found] ` <1190986542.13204.10.camel@twins>
2007-09-28 16:45 ` Alan Stern
2007-09-29 1:27 ` Daniel Phillips
2007-09-28 17:00 ` Trond Myklebust
[not found] ` <1190998853.6702.17.camel@heimdal.trondhjem.org>
[not found] ` <20070928114930.2c201324.akpm@linux-foundation.org>
2007-09-28 18:48 ` Peter Zijlstra
2007-09-28 19:16 ` Trond Myklebust
[not found] ` <1191005339.18147.89.camel@lappy>
2007-09-28 19:16 ` Andrew Morton
[not found] ` <1191006971.6702.25.camel@heimdal.trondhjem.org>
2007-09-28 19:26 ` Andrew Morton
[not found] ` <20070928122628.965137f2.akpm@linux-foundation.org>
2007-09-28 19:52 ` Trond Myklebust
[not found] ` <1191009148.6702.46.camel@heimdal.trondhjem.org>
2007-09-28 20:10 ` Andrew Morton
2007-09-28 20:24 ` Daniel Phillips
[not found] ` <20070928131012.4a03c53e.akpm@linux-foundation.org>
2007-09-28 20:32 ` Trond Myklebust
[not found] ` <1191011538.6702.59.camel@heimdal.trondhjem.org>
2007-09-28 20:43 ` Andrew Morton
2007-09-28 21:36 ` Chakri n
[not found] ` <92cbf19b0709281436i41247863t6cbc919c33e972a3@mail.gmail.com>
2007-09-28 23:33 ` Chakri n
2007-09-29 1:51 ` KDB? Daniel Phillips
2007-09-28 18:49 ` A unresponsive file system can hang all I/O in the system on linux-2.6.23-rc6 (dirty_thresh problem?) Andrew Morton
2007-09-29 0:46 ` Daniel Phillips
[not found] ` <20070929110454.GA29861@mail.ustc.edu.cn>
2007-09-29 11:04 ` Fengguang Wu
[not found] ` <391063897.19256@ustc.edu.cn>
2007-09-29 11:48 ` Peter Zijlstra
[not found] ` <1191066481.18147.115.camel@lappy>
[not found] ` <20070929122842.GA5454@mail.ustc.edu.cn>
2007-09-29 12:28 ` Fengguang Wu
[not found] ` <391068925.28146@ustc.edu.cn>
2007-09-29 14:43 ` Peter Zijlstra
2007-10-01 15:57 ` Chuck Ebbert
[not found] ` <470118EE.1020103@redhat.com>
[not found] ` <391290444.23950@ustc.edu.cn>
2007-10-02 2:14 ` [PATCH] writeback: avoid possible balance_dirty_pages() lockup on a light-load bdi Andrew Morton
[not found] ` <20071002121327.GA5718@mail.ustc.edu.cn>
2007-10-02 12:13 ` Fengguang Wu
[not found] ` <20071002132702.GA10967@mail.ustc.edu.cn>
2007-10-02 13:27 ` Fengguang Wu
[not found] ` <391331626.16970@ustc.edu.cn>
2007-10-02 18:35 ` Chuck Ebbert
[not found] ` <20071002020040.GA5275@mail.ustc.edu.cn>
2007-10-02 2:00 ` Fengguang Wu
2007-10-03 12:46 ` richard kennedy
[not found] ` <1191415612.3123.21.camel@castor.rsk.org>
[not found] ` <20071004015053.GA5789@mail.ustc.edu.cn>
2007-10-04 1:50 ` Fengguang Wu
2007-09-28 6:32 A unresponsive file system can hang all I/O in the system on linux-2.6.23-rc6 (dirty_thresh problem?) Chakri n
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