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

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

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From: Martin Knoblauch

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

Date: Tuesday, December 22, 2009 - 6:01 am

----- Original Message ----

quoted text> From: Wu Fengguang <fengguang.wu@intel.com>
> To: Steve Rago <sar@nec-labs.com>
> Cc: Peter Zijlstra <peterz@infradead.org>; "linux-nfs@vger.kernel.org" <linux-nfs@vger.kernel.org>; "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>; "Trond.Myklebust@netapp.com" <Trond.Myklebust@netapp.com>; jens.axboe <jens.axboe@oracle.com>
> Sent: Tue, December 22, 2009 2:59:07 AM
> Subject: Re: [PATCH] improve the performance of large sequential write NFS workloads
> 

[big snip]

quoted text> 
> 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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Messages in current thread:

[PATCH] improve the performance of large sequential write ..., Steve Rago, (Wed Dec 16, 7:03 pm)

Re: [PATCH] improve the performance of large sequential wr ..., Peter Zijlstra, (Thu Dec 17, 1:17 am)

Re: [PATCH] improve the performance of large sequential wr ..., Steve Rago, (Fri Dec 18, 12:33 pm)

Re: [PATCH] improve the performance of large sequential wr ..., Ingo Molnar, (Fri Dec 18, 12:41 pm)

Re: [PATCH] improve the performance of large sequential wr ..., Peter Zijlstra, (Fri Dec 18, 12:44 pm)

Re: [PATCH] improve the performance of large sequential wr ..., Steve Rago, (Fri Dec 18, 2:20 pm)

Re: [PATCH] improve the performance of large sequential wr ..., Ingo Molnar, (Fri Dec 18, 3:07 pm)

Re: [PATCH] improve the performance of large sequential wr ..., Steve Rago, (Fri Dec 18, 3:46 pm)

Re: [PATCH] improve the performance of large sequential wr ..., Arjan van de Ven, (Sat Dec 19, 1:08 am)

Re: [PATCH] improve the performance of large sequential wr ..., Wu Fengguang, (Sat Dec 19, 5:20 am)

Re: [PATCH] improve the performance of large sequential wr ..., Steve Rago, (Sat Dec 19, 6:37 am)

Re: [PATCH] improve the performance of large sequential wr ..., Steve Rago, (Sat Dec 19, 7:25 am)

Re: [PATCH] improve the performance of large sequential wr ..., Jan Kara, (Tue Dec 22, 5:25 am)

Re: [PATCH] improve the performance of large sequential wr ..., Peter Zijlstra, (Tue Dec 22, 5:38 am)

Re: [PATCH] improve the performance of large sequential wr ..., Jan Kara, (Tue Dec 22, 5:55 am)

Re: [PATCH] improve the performance of large sequential wr ..., Martin Knoblauch, (Tue Dec 22, 6:01 am)

Re: [PATCH] improve the performance of large sequential wr ..., Steve Rago, (Tue Dec 22, 9:20 am)

Re: [PATCH] improve the performance of large sequential wr ..., Jan Kara, (Wed Dec 23, 11:39 am)

Re: [PATCH] improve the performance of large sequential wr ..., Steve Rago, (Wed Dec 23, 1:16 pm)

Re: [PATCH] improve the performance of large sequential wr ..., Trond Myklebust, (Wed Dec 23, 2:49 pm)

Re: [PATCH] improve the performance of large sequential wr ..., Steve Rago, (Wed Dec 23, 4:13 pm)

Re: [PATCH] improve the performance of large sequential wr ..., Trond Myklebust, (Wed Dec 23, 4:44 pm)

Re: [PATCH] improve the performance of large sequential wr ..., Wu Fengguang, (Wed Dec 23, 6:46 pm)

Re: [PATCH] improve the performance of large sequential wr ..., Steve Rago, (Wed Dec 23, 9:30 pm)

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