linux-kernel - Re: [PATCH 0/4] 2.6.21-rc7 NFS writes: fix a series of issues

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Message-Id: <1176868485.6796.42.camel@heimdal.trondhjem.org>
Date:	Tue, 17 Apr 2007 23:54:45 -0400
From:	Trond Myklebust <Trond.Myklebust@...app.com>
To:	Florin Iucha <florin@...ha.net>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Adrian Bunk <bunk@...sta.de>,
	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/4] 2.6.21-rc7 NFS writes: fix a series of issues

On Tue, 2007-04-17 at 22:30 -0500, Florin Iucha wrote:
> On Tue, Apr 17, 2007 at 11:06:05PM -0400, Trond Myklebust wrote:
> > > > I've split the issues introduced by the 2.6.21-rcX write code up into 4
> > > > subproblems.
> > > > 
> > > > The first patch is just a cleanup in order to ease review.
> > > > 
> > > > Patch number 2 ensures that we never release the PG_writeback flag until
> > > > _after_ we've either discarded the unstable request altogether, or put it
> > > > on the nfs_inode's commit or dirty lists.
> > > > 
> > > > Patch number 3 fixes the 'desynchronized value of nfs_i.ncommit' error. It
> > > > uses the PG_NEED_COMMIT flag as an indicator for whether or not the request
> > > > may be redirtied.
> > > > 
> > > > Patch number 4 protects the NFS '.set_page_dirty' address_space operation
> > > > against races with nfs_inode_add_request.
> > > 
> > > For 2.6.21, yes?
> > 
> > Right. A couple of nasty regressions have been sighted. This series
> > attempts to deal with them all.
> 
> The good news is that the Gnome session log-in progresses to the point
> where both top and bottom bars are painted (gray) and the bottom bar
> is populated with icons (2.6.21-rc7 vanilla stops after displaying the
> splash).  The bad news is that it stops there.
> 
> Big-copy fails as well, after 2.5G transferred.
> 
> The process traces are at:
> 
>    http://iucha.net/nfs/21-rc7-nfs1/gnome-session
>    http://iucha.net/nfs/21-rc7-nfs1/big-copy
> 
> Regards,
> florin

Could you tell us a bit more about what happens when these hangs occur?
Does the networking stop too, or just NFS? How about CIFS?

Cheers
  Trond
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