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Subject: Re: Samba performance / zero-copy network I/O
To: glamb@lcis.dyndns.org (Gord R. Lamb)
Date: Wed, 14 Feb 2001 20:29:42 +0000 (GMT)
Cc: linux-kernel@vger.kernel.org
In-Reply-To: <Pine.LNX.4.32.0102141452210.27843-100000@localhost.localdomain> from "Gord R. Lamb" at Feb 14, 2001 03:14:19 PM
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From: Alan Cox <alan@lxorguk.ukuu.org.uk>
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> When reading the profiler results, the largest consuming kernel (calls?)
> are file_read_actor and csum_partial_copy_generic, by a longshot (about
> 70% and 20% respectively).
> 
> Presumably, the csum_partial_copy_generic should be eliminated (or at
> least reduced) by David Miller's zerocopy patch, right?  Or am I
> misunderstanding this completely? :)

To an extent, providing you are using the samba sendfile() patches. SMB cant
make great use of zero copy file I/O due to the fact its not really designed
so much as mutated over time and isnt oriented for speed

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