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
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