linux-kernel - Re: Scatter-gather list constraints

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Message-ID: <48639180.2090005@firstfloor.org>
Date:	Thu, 26 Jun 2008 14:54:24 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Jens Axboe <jens.axboe@...cle.com>
CC:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	stern@...land.harvard.edu, linux-kernel@...r.kernel.org,
	antonio.lin@...ormicro.com, david.vrabel@....com
Subject: Re: Scatter-gather list constraints


> On the fs side, just setting a hw block size of 1k should fix the
> problem, since that'd be your minimum transfer size AND alignment there
> even for O_DIRECT IO.

XFS used to force 512 byte IOs for its log IO. Not sure
that was ever fixed. If it was fixed it likely required a disk format
change (I think s390 ran into a problem like this)

-Andi

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