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Subject: Re: [patch] voluntary-preempt-2.6.8.1-P4
From: Lee Revell <rlrevell@joe-job.com>
To: Ingo Molnar <mingo@elte.hu>
Cc: linux-kernel <linux-kernel@vger.kernel.org>,
       Thomas Charbonnel <thomas@undata.org>,
       Florian Schmidt <mista.tapas@gmx.net>,
       Felipe Alfaro Solana <felipe_alfaro@linuxmail.org>,
       William Lee Irwin III <wli@holomorphy.com>
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On Thu, 2004-08-19 at 04:56, Ingo Molnar wrote:
> > > > Any comments on the unmap_vmas issue?
> > > 
> > > wli indicated he's working on the pagetable zapping critical section
> > > issue - wli?
> 
> actually - the unmap_vmas() issue might be different. Could you change
> the '32' in this part of mm/memory.c:
> 
> # define ZAP_BLOCK_SIZE \
>                 (voluntary_preemption ? (32 * PAGE_SIZE) : __ZAP_BLOCK_SIZE)
> 
> to 16? Does that roughly halve the ~180 usec latency?
> 

Yes, this takes care of it.  Now the dominant latency is the 142us
latency from the via-rhine driver, which is fixed by using the driver
from -mm (specifically it's fixed in bk-netdev.patch).

Lee