Messages in this thread |  | | | Date | Fri, 13 Apr 2007 12:31:13 +0100 | | Subject | Re: [PATCH 0/4] i386 - pte update optimizations | | From | Keir Fraser <> |
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On 13/4/07 13:27, "Andi Kleen" <andi@firstfloor.org> wrote:
>> LOCKed instruction suck really badly on the netburst microarchitecture (like >> factor of 10x, or not far off). I think it's probably because of their side >> effect of serialising memory accesses, causing horrible pipeline stalls. > > Unfortunately they tend to be HyperThreaded usually (except for early ones > and Celerons) and need the LOCK anyways.
Fair point, although quite a few people disable HT.
-- Keir
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