linux-kernel - Re: [PATCH v2] NFS: introduce writeback wait queue

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Date:	Mon, 5 Oct 2009 15:39:59 +0800
From:	Wu Fengguang <fengguang.wu@...el.com>
To:	"jens.axboe@...cle.com" <jens.axboe@...cle.com>
Cc:	Chris Mason <chris.mason@...cle.com>,
	Trond Myklebust <Trond.Myklebust@...app.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-fsdevel@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
	linux-nfs@...r.kernel.org
Subject: Re: [PATCH v2] NFS: introduce writeback wait queue

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
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