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

[H. Peter Anvin]

Keir Fraser wrote:
> 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.

Note we're talking a UP-only hack.

	-hpa
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