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Name: unknown
Date: June 10, 2003 at 09:56:17
Subject: Re: Hyperthreading and 'lock' prefix
In Reply To: Re: Hyperthreading and 'lock' prefix by
Stephan Keil on June 10, 2003 at 09:09:36
Text: | Both processors share the same pipeline. If the pipeline would care
| about read-modify-write conflicts regardless of the executing
| thread (as it does for a single thread), then it would be safe to omit
| the 'lock'. So my question refers more to the current implementations
| of hyperthreaded processors (P4-XEON?!): does the P4 pipeline care about
| those conflicts regardless of the executing thread?

You are sure it doesn't pick and choses from a random stream of microcode instructions to fill all available execution units? I suspect the dispatcher doesn't much care which thread it comes from, at that level it's probably transparent.


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