linux-kernel - Re: Likley stupid question on "throttle_vm

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Date:	Wed, 11 Nov 2009 08:45:54 +0800
From:	Wu Fengguang <fengguang.wu@...el.com>
To:	Martin Knoblauch <spamtrap@...bisoft.de>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Myklebust, Trond" <Trond.Myklebust@...app.com>,
	Peter Staubach <staubach@...hat.com>,
	"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>
Subject: Re: Likley stupid question on "throttle_vm_writeout"

On Wed, Nov 11, 2009 at 12:11:37AM +0800, Martin Knoblauch wrote:
> > This is why I want to limit NR_WRITEBACK for NFS:
> > 
> >         [PATCH] NFS: introduce writeback wait queue
> >         http://lkml.org/lkml/2009/10/3/198
> > 
> 
>  Thanks. I will have a look. Is 2.6.32.x OK for testing?

I have a more recent patch (attached) based on 2.6.32.

This on/off threshold based approach may not be good for producing
fluent network flow. So I'm experimenting to do more fine grained
waits (ie. instead of wait for 10 jiffies at one time, we do 10
1-jiffy spread sleeps).

Thanks,
Fengguang

View attachment "writeback-nfs-request-queue.patch" of type "text/x-diff" (10821 bytes)