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Date: Tue, 30 Jul 2002 01:45:58 +0200
From: Andrea Arcangeli <andrea@suse.de>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Andrew Theurer <habanero@us.ibm.com>, linux-kernel@vger.kernel.org,
       Marcelo Tosatti <marcelo@conectiva.com.br>
Subject: Re: Linux 2.4.19-rc3 (hyperthreading)
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On Mon, Jul 29, 2002 at 10:38:40PM +0200, Andrea Arcangeli wrote:
> On Mon, Jul 29, 2002 at 10:28:42PM +0100, Alan Cox wrote:
> > On Mon, 2002-07-29 at 20:54, Andrew Theurer wrote:
> > > I would caution against having hyperthreading on by default in the 2.4.19 
> > > release.  I am seeing a significant degrade in network workloads on P4 with 
> > > hyperthreading on.  On 2.4.19-pre10, I get 788 Mbps on NetBench, but on 
> > > 2.4.19-rc1 (and probably rc3, should know in an hour), I get 690 Mbps.  It is 
> > > clearly a hyperthreading/interrupt routing issue.  On this system (4 x P4), 
> > 
> > Quite possibly. I've just merged the O(1) scheduler load balancing fixes
> > for the hyperthreading stuff, rc3 uses the old scheduler so that isnt
> 
> btw, please make sure to merge my patch, the original one had several
> severe bugs.

and the new one had a bug too :). Please merge the fix I posted to l-k
too thanks.

Andrea