Re: [PATCH 0/4] i386 - pte update optimizations

[Keir Fraser]

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

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