Re: [PATCH] add a clear_pages function to clear pages of higher order

From: David Mosberger <davidm_at_napali.hpl.hp.com>
Date: 2005-03-25 05:34:03
>>>>> On Fri, 18 Mar 2005 20:28:08 +0100, Andi Kleen <ak@muc.de> said:

  >> stores in general for clearing pages? I checked and Itanium has
  >> always used non-temporal stores. So there will be no benefit for
  >> us from this

  Andi> That is weird. I would actually try to switch to temporal
  Andi> stores, maybe it will improve some benchmarks.

That's definitely the case.  See my earlier post on this topic:

  http://www.gelato.unsw.edu.au/linux-ia64/0409/11012.html

Unfortunately, nobody reported any results for larger machines and/or
more interesting workloads, so the patch is in limbo at this time.
Clearly, if the CPU that's clearing the page is likely to use that
same page soon after, it'd be useful to use temporal stores.

	--david
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Received on Thu Mar 24 13:34:52 2005

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