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Date: Thu, 10 Jan 2002 11:18:25 +0100
From: Andrea Arcangeli <andrea@suse.de>
To: Badari Pulavarty <pbadari@us.ibm.com>
Cc: Benjamin LaHaise <bcrl@redhat.com>, linux-kernel@vger.kernel.org,
        marcelo@conectiva.com.br
Subject: Re: [PATCH] PAGE_SIZE IO for RAW (RAW VARY)
Message-ID: <20020110111825.C3357@inspiron.school.suse.de>
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In-Reply-To: <200201091928.g09JSdH23535@eng2.beaverton.ibm.com>; from pbadari@us.ibm.com on Wed, Jan 09, 2002 at 11:28:39AM -0800
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On Wed, Jan 09, 2002 at 11:28:39AM -0800, Badari Pulavarty wrote:
> Ben,
> 
> By any chance do you have a list of drivers that assume this ? 
> What does it take to fix them ? 
> 
> I think Jens BIO changes for 2.5 will fix this problem. But 
> 2.4 needs a solution in this area too. This patch showed 
> significant improvement for database workloads. 

I didn't checked the implementation but as far as the blkdev is
concerned the b_size changes without notification as soon as you 'mkfs
-b somethingelse' and then mount the fs. So it cannot break as far I can
tell. The only important thing is that b_size stays between 512 and 4k.

> If it is not reasonable to fix all the brokern drivers,
> how about making this configurable (to do variable size IO) ?
> Do you favour this solution ?

no.

Andrea
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