linux-kernel - Re: [PATCH 00/23] per device dirty throttling -v8

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Message-ID: <46BBE6D9.1080904@tmr.com>
Date:	Fri, 10 Aug 2007 00:17:29 -0400
From:	Bill Davidsen <davidsen@....com>
To:	Andi Kleen <andi@...stfloor.org>
CC:	richard kennedy <richard@....demon.co.uk>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, miklos@...redi.hu,
	akpm@...ux-foundation.org, neilb@...e.de, dgc@....com,
	tomoki.sekiyama.qu@...achi.com, nikita@...sterfs.com,
	trond.myklebust@....uio.no, yingchao.zhou@...il.com,
	torvalds@...ux-foundation.org
Subject: Re: [PATCH 00/23] per device dirty throttling -v8

Andi Kleen wrote:
> richard kennedy <richard@....demon.co.uk> writes:
>> This is on a standard desktop machine so there are lots of other
>> processes running on it, and although there is a degree of variability
>> in the numbers,they are very repeatable and your patch always out
>> performs the stock mm2.
>> looks good to me
> 
> iirc the goal of this is less to get better performance, but to avoid long user visible
> latencies.  Of course if it's faster it's great too, but that's only secondary.
> 
What a trade-off, if you want to get rid of long latency you have to 
live with better throughput. I can live with that. ;-)

Your point well taken, not the intent of the patch, but it may indicate 
where a performance bottleneck happens as well.

-- 
Bill Davidsen <davidsen@....com>
   "We have more to fear from the bungling of the incompetent than from
the machinations of the wicked."  - from Slashdot
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