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From: "Chen, Kenneth W" <kenneth.w.chen@intel.com>
To: <ak@suse.de>
Cc: <linux-kernel@vger.kernel.org>
Subject: RE: Update: Industry db benchmark result
Date: Wed, 22 Jun 2005 17:09:17 -0700
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Andi Kleen wrote on Wednesday, June 22, 2005 4:44 PM
> "Chen, Kenneth W" <kenneth.w.chen@intel.com> writes:
> > 
> > It's been hovering around -13%.  
> 
> Do you have an educated guess where the 13% loss is comming from? 

Process scheduler is the prime suspect. Earlier scheduler experiments
on top of 2.6.11 showed that it was about 10% regression.  Similar
experiments repeated on top of 2.6.12-rc4 indicated about a much
smaller 4%.  Other area are O_DIRECT (2%), and possibly scsi.

- Ken