On 13/4/07 13:27, "Andi Kleen" <[EMAIL PROTECTED]> 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 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
