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

Eric Dumazet
2011-09-02T10:08:53Z

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)