Re: getting processor numbers

H. Peter Anvin
2007-04-04T05:41:52Z

Jeremy Fitzhardinge wrote:
> H. Peter Anvin wrote:
>> Mutable data should be separated from code. I think any current CPU
>> will do fine as long as they are in separate 128-byte chunks, but they
>> need at least that much separation.
> P4 manual says that if one processor modifies data within 2k of another
> processor executing code, it will trash the entire trace cache.

Yuck. Didn't realize the P4 was that sensitive. OK, so at the least we
need a half-page of separation.

-hpa