Messages in this thread | | | Date | Fri, 18 Mar 2005 07:00:06 -0800 (PST) | From | Christoph Lameter <> | Subject | Re: [PATCH] add a clear_pages function to clear pages of higher order |
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On Fri, 18 Mar 2005, Denis Vlasenko wrote:
> NT stores are not about 5% increase. 200%-300%. Provided you are ok with > the fact that zeroed page ends up evicted from cache. Luckily, this is exactly > what you want with prezeroing.
These are pretty significant results. Maybe its best to use non-temporal 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 approach (we have 16k and 64k page sizes which may make the situation a bit different). Try to update the i386 architectures to do the same?
Or for prezeroing, you could register a zeroing driver that would use the non-temporal stores with V8 of the prezeroing patches. In any case the clear_pages patch is not useful the way it was intended for us and I am have dropped this from the prezeroing patch.
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