linux-kernel - Re: [BUG] scsi: hpsa: how to destroy your files

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Date:	Fri, 02 Sep 2011 12:08:53 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Jon Mason <mason@...i.com>
Cc:	scameron@...rdog.cce.hp.com,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
	stephenmcameron@...il.com, thenzl@...hat.com,
	akpm@...ux-foundation.org, mikem@...rdog.cce.hp.com,
	linux-pci@...r.kernel.org, Roland Dreier <roland@...estorage.com>,
	James Bottomley <James.Bottomley@...senpartnership.com>
Subject: Re: [BUG] scsi: hpsa: how to destroy your files

Le vendredi 02 septembre 2011 à 11:39 +0200, Eric Dumazet a écrit :
> Le jeudi 01 septembre 2011 à 16:50 -0500, Jon Mason a écrit :
> 
> > I believe modifying the MRRS values is what is causing the issues.
> > Can you try the attached patch and verify that it also resolves the
> > issue?
> 
> I tested this patch and can confirm this solves the corruption problem.
> 
> But my disk is _much_ slower than before
> 
> # hdparm -t /dev/sda1
> 
> Before :
> 
>  Timing buffered disk reads: 254 MB in  3.02 seconds =  84.16 MB/sec
> 
> After :
> 
>  Timing buffered disk reads: 120 MB in  3.04 seconds =  39.42 MB/sec

Hmm, this speed regression is probably old : the 84MB/s was with the
standard debian 6.0.2 kernel (2.6.32-5-amd64)


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