Disable AVX-512 support for macOS Intel host #3065
Open
Conversation
This file contains 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
Handling AVX-512 instructions requires promoting threads in the operating system, but it is not required by distros. So make do with the earlier microarchitectures (v2 and v3), without exposing all the host features of the newest (v4). Signed-off-by: Anders F Björklund <[email protected]>
afbjorklund
force-pushed
the
intel-avx512
branch
from
82e4216 to
858ec2c
Compare
jandubois
approved these changes
Dec 27, 2024
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
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Outdated suggestions cannot be applied.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.
Handling AVX-512 instructions requires promoting threads in the operating system, but it is not required by distros.
So make do with the earlier microarchitectures (v2 and v3), without exposing all the host features of the newest (v4).
v2: https://developers.redhat.com/blog/2021/01/05/building-red-hat-enterprise-linux-9-for-the-x86-64-v2-microarchitecture-level
v3: https://developers.redhat.com/articles/2024/01/02/exploring-x86-64-v3-red-hat-enterprise-linux-10
Closes #3022
Please test with centos-stream-10.yaml on macOS Intel, by commenting out the "cpuType" override in the template
When running on Linux hosts, we can expose AVX-512 in the guest since it doesn't require similar thread promotion.