The requested change is now upstream (v6.3-rc1) as
commit 60675225ebeecea248035fd3a0efc82ae9038a98
Author: Srinivas Pandruvada <[email protected]>
Date: Tue Feb 21 22:45:26 2023 -0800
cpufreq: intel_pstate: Adjust balance_performance EPP for Sapphire
Rapids
** Also affects: linux (Ubuntu Jammy)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu Jammy)
Importance: Undecided => Medium
** Changed in: linux (Ubuntu Jammy)
Status: New => In Progress
** Changed in: linux (Ubuntu Jammy)
Assignee: (unassigned) => Stefan Bader (smb)
** Description changed:
[Feature Description]
Ubuntu uses powersave governor as the default.While the powersave governor
has much lower power, the performance is lower than +25% for several workloads
compared to performance governor.
Report is published: www.Phoronix.com showing difference of 37%
The goal here is to keep mean performance delta of powersave governor
from performance governor around 10% to 12% by running wide variety
of server workloads. For some bursty workload, this delta can be still
large, as ramp up of frequency will still lag with powersave governor
irrespective of EPP setting. The performance governor always requests
maximum frequency.
Based on experiments, EPP of 0x00, 0x10, 0x20, the performance delta for
powersave governor is around 12%. But the EPP 0x20 has 18% lower average
power.
Also experiments are done by raising intel_pstate sysfs min_perf_pct as
high as 50%. This didn't bring in any additional improvements compared
to just changing EPP.
Target Kernel: 6.3
Target Release: 22.04 (5.15 kernel)
[HW/SW Information]
Sapphire Rapids
[Business Justification]
Performance Improvements
Upstream: Merged 6.3
- Commit ID: To be added
+ Commit ID: 60675225ebeecea248035fd3a0efc82ae9038a98
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https://bugs.launchpad.net/bugs/2008519
Title:
cpufreq: intel_pstate: Update Balance performance EPP for Sapphire
Rapids
Status in intel:
Fix Released
Status in linux package in Ubuntu:
Incomplete
Status in linux source package in Jammy:
In Progress
Bug description:
[Feature Description]
Ubuntu uses powersave governor as the default.While the powersave governor
has much lower power, the performance is lower than +25% for several workloads
compared to performance governor.
Report is published: www.Phoronix.com showing difference of 37%
The goal here is to keep mean performance delta of powersave governor
from performance governor around 10% to 12% by running wide variety
of server workloads. For some bursty workload, this delta can be still
large, as ramp up of frequency will still lag with powersave governor
irrespective of EPP setting. The performance governor always requests
maximum frequency.
Based on experiments, EPP of 0x00, 0x10, 0x20, the performance delta for
powersave governor is around 12%. But the EPP 0x20 has 18% lower average
power.
Also experiments are done by raising intel_pstate sysfs min_perf_pct as
high as 50%. This didn't bring in any additional improvements compared
to just changing EPP.
Target Kernel: 6.3
Target Release: 22.04 (5.15 kernel)
[HW/SW Information]
Sapphire Rapids
[Business Justification]
Performance Improvements
Upstream: Merged 6.3
Commit ID: 60675225ebeecea248035fd3a0efc82ae9038a98
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