linux-kernel - Re: Change in default vm_dirty

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Message-ID: <p73ps3rra2v.fsf@bingen.suse.de>
Date:	19 Jun 2007 21:57:44 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	tim.c.chen@...ux.intel.com, linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: Change in default vm_dirty_ratio

Andrew Morton <akpm@...ux-foundation.org> writes:
> 
> It seems too large.  Memory sizes are going up faster than disk throughput
> and it seems wrong to keep vast amounts of dirty data floating about in
> memory like this.  It can cause long stalls while the system writes back
> huge amounts of data and is generally ill-behaved.

A more continuous write out would be better I think. Perhaps the dirty ratio 
needs to be per address space?

> things are trivially tunable and you'd think that after all these years,
> distro initscripts would be establishing the settings, based upon expected
> workload, amount of memory, number and bandwidth of attached devices, etc.

Distro initscripts normally don't have any better clue about any of this
than the kernel.

-Andi
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