** Changed in: amd
Status: Fix Released => In Progress
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https://bugs.launchpad.net/bugs/1941893
Title:
Improve performance and idle power consumption
Status in amd:
In Progress
Status in linux-oem-5.14 package in Ubuntu:
Invalid
Status in linux-oem-5.14 source package in Focal:
Fix Released
Bug description:
[Impact]
This can improve AMD performance for all Zen or newer CPU which support C3
shares cache.
[Fix]
Its not necessary to flush the caches in software before entering
C3.
Empirical measurements show:
40-45% improvement in speedometer score.
~15% improvement in idle power.
The patch is in linux-next (tag next-20211007) and can be found @
https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-
next.git/commit/arch/x86/kernel/acpi/cstate.c?id=a8fb40966f19ff81520d9ccf8f7e2b95201368b8
[Test]
This is requested by AMD.
[Where problems could occur]
Low risk. This only works on AMD Zen CPUs that supports this
features. AMD tested it and provided estimated measurement results.
==== Original descriptions ====
A patch queued for 5.15 to change the C3 entry will improve AMD performance.
https://lore.kernel.org/patchwork/patch/1478776/
Empirical measurements show:
40-45% improvement in speedometer score.
~15% improvement in idle power.
Can you please include in 5.13-oem and 5.14-oem kernels?
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