linux-kernel - Re: [PATCH] libata: reorder ata_queued_cmd to remove alignment padding on 64 bit builds

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Date:	Sun, 12 Sep 2010 12:21:21 +0100
From:	Richard Kennedy <richard@....demon.co.uk>
To:	Hugo Antunes <hugo.antunes@...il.com>
Cc:	jgarzik <jgarzik@...ox.com>, Tejun Heo <tj@...nel.org>,
	lkml <linux-kernel@...r.kernel.org>, linux-ide@...r.kernel.org
Subject: Re: [PATCH] libata: reorder ata_queued_cmd to remove alignment
 padding on 64 bit builds

On Fri, 2010-09-10 at 15:22 +0100, Hugo Antunes wrote:
> Greetings,
> 
> Following the list this pasts days, building a big machine with 45
> sata2 disks (WD green 1.5TB), Sil3124 4 ports sata2 with 9 port
> multipliers with 5 each also from Silicom image.
> 
> This machine should smoke but it doesn't, attached is the dmesg dump where it is possible to see the enourmous ammount
>  of hard and soft resets.Using Ubuntu/server 10.4 2.6.32-25-server x86_64, been questioning if this patch could 
> make me have better numbers from this system, going to build a debian/ubuntu kernel image with the patch, if anyone 
> has a link for a deb image with this patch..apreciated.
> 
> Keep the good work
> 
> Regards,
> ./hantunes
Hi,
I think it's very unlikely that my patch will have any impact on your
problem, it is only a very minor improvement when creating new ports.

I didn't get the dmesg attachment so I can't tell what sort of problems
you are having, but with that many drives I'd start by checking the
power supplies & cables and then try the latest kernel. 

regards
Richard



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