On 13/3/21 6:47 am, Eli Schwartz via arch-dev-public wrote: > On 3/4/21 6:33 AM, Allan McRae via arch-dev-public wrote: >> On 3/3/21 10:54 am, Allan McRae via arch-dev-public wrote: >>> On 2/3/21 9:51 pm, Allan McRae wrote: >>>> Hi all, >>>> >>>> A new RFC has been opened here: >>>> https://gitlab.archlinux.org/archlinux/rfcs/-/merge_requests/2 >>>> >>>> Summary: >>>> Make -march=x86_64-v2 the default for our packages. This assumes the >>>> following instruction sets which are essentially available on all but >>>> the oldest AMD CPUs: >>>> >>>> CMPXCHG16B, LAHF-SAHF, POPCNT, SSE3, SSE4.1, SSE4.2, SSSE3 >>>> >>>> Please visit the above link for discussion. >> >> Lets put discussion on this RFC on hold for a while. Clearly there is a >> reasonable amount of objection to making x86-64-v2 the default. While >> this mostly appears to be objection based on personal circumstances and >> not on the basis of whether this change is good for the distro, I will >> work within these limits. >> >> A lot of comments have suggested adding x86-64-v2 and -v3 as additional >> architectures instead. I will revamp the the proposal to take that >> approach. Though, to do this automated would require more work it may >> be the push we need for a signing enclave to be set up. > > > For the record -- the RFC has now been revamped. The new form of the > proposal is to add a -v3 (skipping right over -v2) additional architecture. > > ``` > Alternatives Considered > ----------------------- > > Moving the baseline to x86-64-v2 was discussed, but the gains were not > considered enough to justify removal of support for hardware without > SSE4.2. > ```
As an FYI - I'm still working on the RFC update. I forgot that pushing to my branch updated the merge request... I'll post a new RFC on the mailing list once it is ready for comment. People are of course free to comment as I work on it so it is in better shape once it is submitted. Allan
