linux-kernel - Re: [PATCH 0/8][RFC] IO latency/throughput fixes

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Message-ID: <alpine.LFD.2.00.0904060840080.3863@localhost.localdomain>
Date:	Mon, 6 Apr 2009 08:45:09 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Jens Axboe <jens.axboe@...cle.com>
cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	tytso@....edu
Subject: Re: [PATCH 0/8][RFC] IO latency/throughput fixes

On Mon, 6 Apr 2009, Jens Axboe wrote:
>
> > Jens - I can just apply this queue (I want to test it out anyway), or if 
> > you prefer I can pull from you. Just tell me.
> 
> Whatever you want, if you want to pull instead of manually applying,
> it's:
> 
> git://git.kernel.dk/linux-2.6-block.git blk-latency

Ok, I applied them for testing anyway, so I think I'll just keep the 
series I have in my tree. I'm keeping my nasty "dd+sync" going in the 
background, just to verify that things really feel better, but I'm already 
convinced this is a winner. Especially with the request size limiter, I 
can really read email _almost_ as if nothing else was going on on the 
machine. 

With that request size limiting, my fsync pauses tend to be in the 250ms 
range, with a one 0.75s outlier in the last few minutes. I can definitely 
feel that quarter-second thing, and the .75s pause was a real stutter, but 
boy what a difference. I don't get the uncontrollable urge to kill that 
nasty background writer any more.

			Linus
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