From: Wu Fengguang <fengguang.wu-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
To: Jens Axboe <jens.axboe-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
Cc: Trond Myklebust
<Trond.Myklebust-HgOvQuBEEgTQT0dZR+AlfA@public.gmane.org>,
Andrew Morton
<akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>,
"linux-fsdevel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
<linux-fsdevel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
LKML <linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
"linux-nfs-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
<linux-nfs-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>
Subject: Re: [PATCH] NFS: introduce writeback wait queue
Date: Tue, 6 Oct 2009 08:12:12 +0800 [thread overview]
Message-ID: <20091006001212.GA6241@localhost> (raw)
In-Reply-To: <20091005110010.GW26573-tSWWG44O7X1aa/9Udqfwiw@public.gmane.org>
On Mon, Oct 05, 2009 at 07:00:11PM +0800, Jens Axboe wrote:
> On Sun, Oct 04 2009, Wu Fengguang wrote:
> > Hi Jens,
> >
> > This is a bug fix for 2.6.32. Maybe other not block-queue based
> > filesystems will have similar issues ..
>
> Not that I'm aware of, the NFS use is fairly special. Given that this is
Sorry for the confusion. 2.6.32 is safe. I tested NFS, fuse and cifs.
NFS writes will be throttled at the dirty limit, and fuse/cifs see
near zero nr_writeback/nr_dirty numbers during heavy write.
NFS and fuse does set the bdi congestion state and somehow expects it to
backoff background flushing. This IO priority thing could be fixed for
next merged window.
> purely in the realm of nfs/, I'll let Trond decide how to include and
> push this (when a final patch is agreed upon).
>
> Thanks for looking into this!
Thanks,
Fengguang
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next prev parent reply other threads:[~2009-10-06 0:12 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-10-04 3:01 [PATCH] NFS: introduce writeback wait queue Wu Fengguang
2009-10-04 3:05 ` Wu Fengguang
2009-10-05 11:00 ` Jens Axboe
[not found] ` <20091005110010.GW26573-tSWWG44O7X1aa/9Udqfwiw@public.gmane.org>
2009-10-06 0:12 ` Wu Fengguang [this message]
2009-10-05 7:10 ` [PATCH v2] " Wu Fengguang
2009-10-05 7:35 ` Wu Fengguang
2009-10-05 7:39 ` Wu Fengguang
2009-10-05 10:55 ` Myklebust, Trond
[not found] ` <F047DA72-75B3-4447-84EB-7115C77ECBA3-HgOvQuBEEgTQT0dZR+AlfA@public.gmane.org>
2009-10-05 13:08 ` Wu Fengguang
2009-10-05 11:01 ` Myklebust, Trond
[not found] ` <86DD3A52-EE5C-4378-BEB6-6336E17CFCD5-HgOvQuBEEgTQT0dZR+AlfA@public.gmane.org>
2009-10-05 13:51 ` Wu Fengguang
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