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Name: Oliver
eMail: Follow.Me@gmx.net
Date: June 17, 2003 at 07:22:56
Subject: Re: Hyperthreading and 'lock' prefix
In Reply To: Re: Hyperthreading and 'lock' prefix by
Stephan Keil on June 17, 2003 at 06:22:33
Text: > He also explains, that LOCK only locks the cache, ...

Yes, since the PPro.

> ... if the affected value is locally cached. So for performance
> reasons it might be useful to ensure that the value is cached.

I hardly doubt that any x86 SMP-system would do that modification on
another CPU's cache. I belive it's the same like with the unLOCKed ver-
sions of the uniprocessor-atomic operations: when the value is in another
CPU's cache, it's transferred to the local cache and invalidated in the
remote cache; and if there's a redundant copy in any remote cache, it's
simply invalidated - just the MESIsh way.


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