On 13/4/07 13:27, "Andi Kleen" <andi@xxxxxxxxxxxxxx> 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 _______________________________________________ Virtualization mailing list Virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/virtualization
