From: Wu Fengguang <fengguang.wu@intel.com>
To: "jens.axboe@oracle.com" <jens.axboe@oracle.com>
Cc: Chris Mason <chris.mason@oracle.com>,
Trond Myklebust <Trond.Myklebust@netapp.com>,
Andrew Morton <akpm@linux-foundation.org>,
linux-fsdevel@vger.kernel.org,
LKML <linux-kernel@vger.kernel.org>,
linux-nfs@vger.kernel.org
Subject: Re: [PATCH v2] NFS: introduce writeback wait queue
Date: Mon, 5 Oct 2009 15:39:59 +0800 [thread overview]
Message-ID: <20091005073959.GA23398@localhost> (raw)
In-Reply-To: <20091005073551.GA23102@localhost>
On Mon, Oct 05, 2009 at 03:35:51PM +0800, Wu Fengguang wrote:
> Trond, I see this trace on linux-next. There are no more dirty pages
> when `cp' aborts after filling up the partition:
>
> cp: writing `/mnt/test/zero3': No space left on device
>
> I noticed that since then nr_writeback is decreased very slowly
> (~100 pages per second). Looks like an interesting behavior.
In the mean time, there are constant 7-8MB/s writes in the NFS server.
The network flow is much smaller ~400K/s. How can I debug this issue?
Thanks,
Fengguang
> nr_writeback nr_dirty nr_unstable
> 41230 36284 8764
> 41230 37307 7755
> 40009 42812 3818
> 32619 42812 11198
> 32314 42812 11503
> 31894 42812 11862
> 31832 42812 11871
> 31770 42812 11871
> 31721 42812 11871
> 31653 42812 11871
> 40789 33754 11871
> 40713 33754 11871
> 40638 33754 11871
> 40566 33754 11871
> 43901 30313 11871
> 74164 0 11871
> 74062 0 11871
> 73978 0 11871
> 73904 0 11871
> 73858 0 11871
> 73798 0 11871
> 73688 0 11871
> 73580 0 11871
> 73477 0 11871
>
> Thanks,
> Fengguang
next prev parent reply other threads:[~2009-10-05 7:40 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
2009-10-06 0:12 ` Wu Fengguang
2009-10-05 7:10 ` [PATCH v2] " Wu Fengguang
2009-10-05 7:35 ` Wu Fengguang
2009-10-05 7:39 ` Wu Fengguang [this message]
2009-10-05 10:55 ` Myklebust, Trond
2009-10-05 13:08 ` Wu Fengguang
2009-10-05 11:01 ` Myklebust, Trond
2009-10-05 13:51 ` Wu Fengguang
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