On 13/4/07 13:27, "Andi Kleen" <andi@xxxxxxxxxxxxxx> wrote:
LOCKed instruction suck really badly on the netburst microarchitecture (likeUnfortunately they tend to be HyperThreaded usually (except for early ones
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.
and Celerons) and need the LOCK anyways.
Fair point, although quite a few people disable HT.