Re: [uml-devel] [PATCH] host context switch reduction

["roland" <for_spam@gmx.de>]

hi !
has this / will this be ported to 2.6 ?
have there been made further performance comparisons ?
regards
roland


>Well, we just looked at the context switches. We started 3 UMLs which
>were doing a make world for xfree. Without patches the number of
>context switches per second was around 60k, with the patch it was around
>40k - so it's noticeable, at least from the cs.
>Sven

----- Original Message ----- 
From: "Jeff Dike" <jdike@addtoit.com>
To: <user-mode-linux-devel@lists.sourceforge.net>
Sent: Sunday, February 29, 2004 6:35 AM
Subject: [uml-devel] [PATCH] host context switch reduction


> The patches below are from Laurent Vivier who didn't make them public.  They
> add a new feature to ptrace on the host which cuts down on the number of
> context switches needed for a UML system call, plus makes UML use it.
> 
> There's some interest in this, so I'm putting it out as-is.  I haven't played
> with it.
> 
> Laurent did some performance testing and found ~40% speedup on a getpid
> loop, and a 3.5% speedup on a kernel build.
> 
> Jeff
> 
> 


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