On So, 2022-07-10 at 10:36 -0700, Gordon Messmer wrote:
On 7/10/22 04:38, Vitaly Zaitsev via devel wrote:
> Have you rebuilt all system packages with -fno-omit-frame-pointer or
> just tested packages?
No. Early in the thread, Tomasz Torcz posted a link to a Phoronix
article as evidence that Fedora's performance was behind other
distributions. At one point, I expressed doubt that intel_pstate in
performance mode was the reason for some significant differences, so I
ran some tests to try to either prove or disprove that explanation.
Having done so, I don't think the results that Phoronix published are
useful as evidence of anything.
it is well known(TM) that ceph performance
suffers when not running with "performance" governor.
see e.g. this blog (CTRL-F "powersave"):
https://croit.io/blog/ceph-performance-test-and-optimization
where IOPS are roughly quadrupled, when disabling the powersaving features.
see also the holy bible of ceph performance tuning:
https://yourcmc.ru/wiki/Ceph_performance#CPUs
but the internet is full with benchmarks and real workload
scenarios which show that the cpu performance governor has
a real impact on highly concurrent workloads.
this might not apply to workstations, but it indeed does
apply to datacenter workloads, like SDS.
--
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