Message-ID: <43A588C5.4020907@cybsft.com>
Date: Sun, 18 Dec 2005 10:05:25 -0600
From: "K.R. Foley" <kr@cybsft.com>
Organization: Cybersoft Solutions, Inc.
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To: Steven Rostedt <rostedt@goodmis.org>
CC: Ingo Molnar <mingo@elte.hu>, linux-kernel@vger.kernel.org,
       Gunter Ohrner <G.Ohrner@post.rwth-aachen.de>,
       john stultz <johnstul@us.ibm.com>
Subject: Re: 2.6.15-rc5-rt2 slowness
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Steven Rostedt wrote:
> Ingo,
> 
> I ported your old changes of 2.6.14-rt22 of mm/slab.c to 2.6.15-rc5-rt2
> and tried it out.  I believe that this confirms that the SLOB _is_ the
> problem in the slowness.  Booting with this slab patch, gives the old
> speeds that we use to have.
> 
> Now, is the solution to bring the SLOB up to par with the SLAB, or to
> make the SLAB as close to possible to the mainline (why remove NUMA?)
> and keep it for PREEMPT_RT?
> 
> Below is the port of the slab changes if anyone else would like to see
> if this speeds things up for them.
> 
> -- Steve
> 

This drastically improves performance on my slower uniprocessor system.
2.6.15-rc5-rt2 still doesn't boot on my dual 933 box, with or without
this patch. I will try to dig into that a bit more today.

-- 
   kr
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