Public bug reported:
On Intel Emerald Rapids machines (fifth generation Xeon Scalable server
processors), we ship the Energy Performance Preference (EPP) default for
balance_performance (the default setting) as 128. However, during an
internal investigation together with Intel, we have determined that 32
is a more suitable value. This leads to significant improvements in both
performance and energy:
POV-Ray: 32% faster | 12% less energy
OpenSSL: 12% faster | energy within 1%
Build Linux Kernel: 29% faster | 18% less energy
Therefore, we should move our default EPP for balance_performance to 32.
This is currently handled in the intel_pstate driver and should be
upstreamed soon. However, as there are significant performance and
energy gains, I propose we patch this as soon as possible.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2075533
Title:
Fix performance regression caused by bad default EPP value on Emerald
Rapids
Status in linux package in Ubuntu:
New
Bug description:
On Intel Emerald Rapids machines (fifth generation Xeon Scalable
server processors), we ship the Energy Performance Preference (EPP)
default for balance_performance (the default setting) as 128. However,
during an internal investigation together with Intel, we have
determined that 32 is a more suitable value. This leads to significant
improvements in both performance and energy:
POV-Ray: 32% faster | 12% less energy
OpenSSL: 12% faster | energy within 1%
Build Linux Kernel: 29% faster | 18% less energy
Therefore, we should move our default EPP for balance_performance to
32. This is currently handled in the intel_pstate driver and should be
upstreamed soon. However, as there are significant performance and
energy gains, I propose we patch this as soon as possible.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2075533/+subscriptions
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