Perf[ntsa_domainname.h]: improve CPU cache locality - #383
Merged
Merged
Conversation
Place domain name size before buffer to improve CPU cache locality.
mattrm456
approved these changes
Sep 16, 2026
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
2 participants
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
Place domain name size before buffer to improve CPU cache locality.
With short domain names (less than 60 bytes), the accessed data fits into just 1 CPU cache line that is 64 bytes.
The existing implementation guarantees that 2 cache lines will be used, because we have to access the data in the beginning of
d_bufferand accessd_sizethat are 256 bytes apart from each other.