Messages in this thread | | | Date | Fri, 13 Apr 2007 08:34:06 -0700 | From | "H. Peter Anvin" <> | Subject | Re: [PATCH 0/4] i386 - pte update optimizations |
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Keir Fraser wrote: > 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.
Note we're talking a UP-only hack.
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