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Comment from Rishi on kreg-facts #750

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Merged
travisdowns merged 1 commit into from
Sep 6, 2025
Merged

Comment from Rishi on kreg-facts #750

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13 changes: 13 additions & 0 deletions _data/comments/kreg-facts/entry1756906402454.yml
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_id: 8fa9b300-88ca-11f0-9585-874f1f8459af
_parent: 'https://travisdowns.github.io/blog/2019/12/05/kreg-facts.html'
replying_to_uid: ''
message: >-
The reason CPU is hitting brakes at 95% fill of PRF could be because it
reserves few entries for a 2nd thread if it support hyperthreading/SMT. Some
out of order structures reserve few entries for forward progress as well, in
the event one op comes in non-speculatively. But PRF allocation might not be
out-of-order, so that might not apply here.
name: Rishi
email: 0a2adbcf9e25b9a649c8c302cbfa80bf
hp: ''
date: 1756906402
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