Re: [PATCH] improve the performance of large sequential write NFS workloads

[Martin Knoblauch]

----- Original Message ----

> From: Wu Fengguang <fengguang.wu@xxxxxxxxx>
> To: Steve Rago <sar@xxxxxxxxxxxx>
> Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>; "linux-nfs@xxxxxxxxxxxxxxx" <linux-nfs@xxxxxxxxxxxxxxx>; "linux-kernel@xxxxxxxxxxxxxxx" <linux-kernel@xxxxxxxxxxxxxxx>; "Trond.Myklebust@xxxxxxxxxx" <Trond.Myklebust@xxxxxxxxxx>; jens.axboe <jens.axboe@xxxxxxxxxx>
> Sent: Tue, December 22, 2009 2:59:07 AM
> Subject: Re: [PATCH] improve the performance of large sequential write NFS workloads
> 

[big snip]

> 
> In general it's reasonable to keep NFS per-file nr_dirty low, however
> questionable to do per-file nr_writeback throttling. This does not
> work well with the global limits - eg. when there are many dirty
> files, the summed-up nr_writeback will still grow out of control.
> And it's more likely to impact user visible responsiveness than
> a global limit. But my opinion can be biased -- me have a patch to
> do global NFS nr_writeback limit ;)
> 


 is that  "NFS: introduce writeback wait queue", which you sent me a while ago and I did not test until now :-( ?

Cheers
Martin
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