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

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Date:	Tue, 22 Dec 2009 05:01:46 -0800 (PST)
From:	Martin Knoblauch <knobi@...bisoft.de>
To:	Wu Fengguang <fengguang.wu@...el.com>,
	Steve Rago <sar@...-labs.com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	"linux-nfs@...r.kernel.org" <linux-nfs@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Trond.Myklebust@...app.com" <Trond.Myklebust@...app.com>,
	"jens.axboe" <jens.axboe@...cle.com>
Subject: Re: [PATCH] improve the performance of large sequential write NFS workloads

----- Original Message ----

> From: Wu Fengguang <fengguang.wu@...el.com>
> To: Steve Rago <sar@...-labs.com>
> Cc: Peter Zijlstra <peterz@...radead.org>; "linux-nfs@...r.kernel.org" <linux-nfs@...r.kernel.org>; "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>; "Trond.Myklebust@...app.com" <Trond.Myklebust@...app.com>; jens.axboe <jens.axboe@...cle.com>
> 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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