linux-kernel - Re: [PATCH 1/3] readahead: drop behind

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Date:	Sat, 21 Jul 2007 23:06:39 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Eric St-Laurent <ericstl34@...patico.ca>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	Fengguang Wu <wfg@...l.ustc.edu.cn>, riel <riel@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Tim Pepper <lnxninja@...ibm.com>,
	Chris Snook <csnook@...hat.com>
Subject: Re: [PATCH 1/3] readahead: drop behind

On Sat, 2007-07-21 at 16:59 -0400, Eric St-Laurent wrote:
> > They are against git of a few hours ago and the latest readahead patches
> > from Wu (which don't apply cleanly either, but the rejects are trivial).
> > 
> > > It would be useful to have a temporary /proc tunable to enable/disable
> > > the heuristic to help test the effects.
> > 
> > Right, I had such a patch somewhere,.. won't apply cleanly but should be
> > obvious..
> 
> Thanks, I will merge theses and report back with some results.
> 
> After copying large files, I find my system sluggish. I hope your
> changes will help.

Yeah, copying will still hurt. This will only help reading large files,
not writing :-/

For that I still need an inspiring idea.

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