linux-kernel - Re: Change in default vm_dirty

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Message-Id: <1182211793.2707.3.camel@laptopd505.fenrus.org>
Date:	Mon, 18 Jun 2007 17:09:53 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	tim.c.chen@...ux.intel.com, linux-kernel@...r.kernel.org
Subject: Re: Change in default vm_dirty_ratio

> Is it good to keep tons of dirty stuff around? Sure. It allows overwriting 
> (and thus avoiding doing the write in the first place), but it also allows 
> for a more aggressive IO scheduling, in that you have more writes that you 
> can schedule.

it also allows for an elevator that can merge more so that there are
less seeks...

so it's not all pure artificial ;(

I really don't like doing just-for-benchmark tuning ... but I wonder how
much real workloads this will get too (like installing or upgrading a
bunch of rpms)

As for the smoother IO thing.. there's already a kernel process that
writes this lot out after 5 seconds... so that ought to smooth some of
this out already.... I would hope.

(I'm not arguing this change is wrong, I'm just grinding my teeth on how
long updating rpms already takes... for no apparent reason)

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