Re: 2.5.36-mm1 dbench 512 profiles

From: Maneesh Soni (
Date: Fri Sep 20 2002 - 02:59:28 EST

On Fri, 20 Sep 2002 05:48:38 +0530, William Lee Irwin III wrote:

> Hanna Linder wrote:
>>> Looks like fastwalk might not behave so well on this 32 cpu numa
>>> system...
> On Thu, Sep 19, 2002 at 04:38:14PM -0700, Andrew Morton wrote:
>> I've rather lost the plot. Have any of the dcache speedup patches been
>> merged into 2.5?
> As far as the dcache goes, I'll stick to observing and reporting. I'll
> rerun with dcache patches applied, though.
> Thanks,
> Bill
> -

For a 32-way system fastwalk will perform badly from dcache_lock point of
view, basically due to increased lock hold time. dcache_rcu-12 should reduce
dcache_lock contention and hold time. The patch uses RCU infrastructer patch and
read_barrier_depends patch. The patches are available in Read-Copy-Update
section on lse site at


Maneesh Soni
IBM Linux Technology Center, 
IBM India Software Lab, Bangalore.
Phone: +91-80-5044999 email:
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