linux-kernel - Re: huge improvement with per-device dirty throttling

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Message-ID: <p733aybzv6e.fsf@bingen.suse.de>
Date:	22 Aug 2007 13:05:13 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	"Jeffrey W. Baker" <jwbaker@....org>
Cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: huge improvement with per-device dirty throttling

"Jeffrey W. Baker" <jwbaker@....org> writes:
> 
> My system is a Core 2 Duo, 2GB, single SATA disk.

Hmm, I thought the patch was only supposed to make a real difference
if you have multiple devices? But you only got a single disk.   

At least that was the case  it was supposed to fix: starvation of fast 
devices from slow devices.

Ok perhaps the new adaptive dirty limits helps your single disk
a lot too. But your improvements seem to be more "collateral damage" @)

But if that was true it might be enough to just change the dirty limits
to get the same effect on your system. You might want to play with
/proc/sys/vm/dirty_*

-Andi

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