linux-kernel - Re: [RFC][PATCH 0/3] Skip I/O merges when disabled

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Message-ID: <ed038eb20804241504s17f7c0edu6ab0017e59fb7535@mail.gmail.com>
Date:	Fri, 25 Apr 2008 00:04:33 +0200
From:	"Carl Henrik Lunde" <chlunde@...g.uio.no>
To:	"Alan D. Brunelle" <Alan.Brunelle@...com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Andi Kleen" <andi@...stfloor.org>,
	"Jens Axboe" <jens.axboe@...cle.com>
Subject: Re: [RFC][PATCH 0/3] Skip I/O merges when disabled

On Thu, Apr 24, 2008 at 4:13 PM, Alan D. Brunelle <Alan.Brunelle@...com> wrote:
[...]
>  o  The kernel already exports stats on merges, so the daemon could watch
>  those stats in comparison to the number of I/Os submitted. If it
>  determined that merge attempts were not being very successful, it could
>  turn off merges for a period of time. Later it could turn them back on,
>  watch for a while, and repeat.
>
>  Does this sound better/worthwhile?

It may be more interesting to make a program which makes some helpful
suggestions
after looking at a blktrace file.  The program could for example
suggest changing
the I/O scheduler, increasing a parameter such as slice_sync, or disable merges.

-- 
Carl Henrik
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