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Subject: Re: choice of raid5 checksumming algorithm wrong ?
From: Soeren Sonnenburg <kernel@nn7.de>
To: Rene Rebe <rene.rebe@gmx.net>
Cc: Linux Kernel <linux-kernel@vger.kernel.org>
In-Reply-To: <20030111.203913.846936097.rene.rebe@gmx.net>
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	 <20030111.203913.846936097.rene.rebe@gmx.net>
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On Sat, 2003-01-11 at 20:39, Rene Rebe wrote:
> Hi.
> 
> I also consider the kprint message a useability bug - and this is why
> I posted a patch that prints out that the algorithm is choosen to
> write "arround" the L2 cache ... - We patch this in our ROCK Linux
> standard patches ...

I would vote for such a cosmetic patch to be included...

Soeren.

> On: Sat, 11 Jan 2003 16:45:04 +0100,
>     Lionel Bouton <Lionel.Bouton@inet6.fr> wrote:
> > Soeren Sonnenburg wrote:
> > 
> > >Hi!
> > >
> > >I really do wonder whether the displayed message is wrong or why it
> > >always chooses the slowest checksumming function (happens with 2.4.19 -
> > >21pre3)
> > >  
> > >
> > SSE is always preferred because unlike other checksumming code it 
> > doesn't use the processor caches when reading/writing data/checksum.
> > This is slower (if several GB/s can be considered slow) for the 
> > checksumming but far better for the overall system performance.
> > 
> > LB.
> 
> - Ren?
> 
> --  
> Ren? Rebe - Europe/Germany/Berlin
> e-mail:   rene.rebe@gmx.net, rene@rocklinux.org
> web:      www.rocklinux.org, drocklinux.dyndns.org/rene/
> 
> Anyone sending unwanted advertising e-mail to this address will be
> charged $25 for network traffic and computing time. By extracting my
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