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Date: Sat, 11 Jan 2003 20:39:13 +0100 (CET)
Message-Id: <20030111.203913.846936097.rene.rebe@gmx.net>
To: Lionel.Bouton@inet6.fr
Cc: kernel@nn7.de, linux-kernel@vger.kernel.org
Subject: Re: choice of raid5 checksumming algorithm wrong ?
From: Rene Rebe <rene.rebe@gmx.net>
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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 ...

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/

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