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RE: [Xen-devel] [PATCH] x86: add SSE-based copy_page()
| To: | "Keir Fraser" <keir.fraser@xxxxxxxxxxxxx>, "Dexuan Cui" <dexuan.cui@xxxxxxxxx>, "Dan Magenheimer" <dan.magenheimer@xxxxxxxxxx> |
|---|---|
| Subject: | RE: [Xen-devel] [PATCH] x86: add SSE-based copy_page() |
| From: | "Jan Beulich" <jbeulich@xxxxxxxxxx> |
| Date: | Tue, 13 Jan 2009 08:31:09 +0000 |
| Cc: | xen-devel@xxxxxxxxxxxxxxxxxxx |
| Delivery-date: | Tue, 13 Jan 2009 00:31:03 -0800 |
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>>> Dan Magenheimer <dan.magenheimer@xxxxxxxxxx> 13.01.09 00:29 >>> >I'm guessing the gcc optimizer for the memcpy code was tuned >for an Intel pipeline... Jan, were you measuring on an >AMD processor? Oh, actually my previous reply was without pushing my thinking fully back to what I was doing (and measuring) back then. I really measured on quad core Xeons, as what I was looking at were the highmem helpers. Pretty likely this almost exclusively covered the cold cache (all levels) case, but I also think this is the most likely scenario. Jan _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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