On 6/17/22 12:15, Demi Marie Obenour wrote:
On 6/17/22 01:41, Tomasz Torcz wrote:
I can only concur. Say what you want about Phoronix benchmark, but
they consistently benchmark different distributions And Fedora
consistently is lagging behind. Latest article is at
https://www.phoronix.com/scan.php?page=article&item=h1-2022-linux
Slowing Fedora even further is really undesirable.
What would it take to make Fedora faster?
If you go back a few years, it was pretty common for Fedora to perform
below average in these benchmarks, and that really isn't the case any
more. The top performing systems in these benchmarks are Clear Linux
and RHEL rebuilds (which, in this context, I think we can probably just
treat as a proxy for RHEL performance.) Clear and RHEL (rebuilds)
probably get most of their advantages from building for an x86_64-v2
microarchitecture, which Fedora discussed and rejected last year (after
discussing and rejecting a proposal to build for x86_64-v3 two years
before that.) If you exclude Clear and RHEL (rebuilds), Fedora's
showing in the Phoronix benchmarks above is, subjectively, pretty good.
So, I don't think that Tomasz's claim that Fedora is consistently
lagging behind is true for the last couple of years, though it had been
in the past. (It is also probably true that when Fedora Workstation is
tested instead of Fedora Server, btrfs impacts some benchmarks.)
To Demi's question, though, I would venture a guess that building glibc
(and possibly some other libraries) for more modern microarchitectures
and shipping that support in hwcaps would probably be a big step
forward, at the cost of some disk space. It was mentioned in Neal's
x86_64-v2 thread, but that discussion didn't seem to go anywhere.
Building the whole OS for a more modern microarchitecture would probably
also help, at the cost of compatibility with older hardware, and that
doesn't seem like an trade-off Fedora is willing to consider today.
https://docs.01.org/clearlinux/latest/reference/system-requirements.html#id1
https://developers.redhat.com/blog/2021/01/05/building-red-hat-enterprise-linux-9-for-the-x86-64-v2-microarchitecture-level#
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