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Subject: Re: [patch] voluntary-preempt-2.6.8-rc2-M5
From: Lee Revell <rlrevell@joe-job.com>
To: Ingo Molnar <mingo@elte.hu>
Cc: linux-kernel <linux-kernel@vger.kernel.org>, Andrew Morton <akpm@osdl.org>,
       Scott Wood <scott@timesys.com>
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On Fri, 2004-07-30 at 18:54, Lee Revell wrote:

> Here are my results with 2.6.8-rc2-mm1-M5.
> 
> 							max usecs
> All IRQs threaded					349
> Soundcard IRQ not threaded				227
> Soundcard IRQ not threaded + max_sectors_kb -> 64	119
> 
> I will test next with 2.6.8-rc2-M5.
> 

Results with 2.6.8-rc2-M5:

Configuration						max usecs
-----------------------------------------------------------------
All IRQs threaded					370 
Soundcard IRQ not threaded				335
Soundcard IRQ not threaded + max_sectors_kb -> 64	161

So, it looks like the added configurability does add some overhead - 161
usecs vs. 50.  mm1 is significantly better than the stock kernel.  The
above results imply that 2.6.8-rc2-mm1 with the irq.c hack would be
frighteningly good.

Lee