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SubjectRe: [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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