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> On 28 Jul 2025, at 07:16, m...@alex0.net wrote:
>
> Hi,
>
> Hoping someone smarter than I can help out here 🙂 I have a Meteor Lake
> machine which has the new P/E core architecture. I am trying to optimise a
> mobile platform for on-battery runtime and from the documentation I have read
> this requires CPUs to be in ACPI state C3 (which corresponds to platform
> state C10). Though I’ve enabled cpuidle (with the corresponding GRUB
> parameter) the issue I’m having is Xen will never enter C3 on any cores once
> there are a certain number of HVMs running (on my platform it is around 3-4),
> no matter which cores they are pinned to. For example, even if I pin the HVMs
> (and their corresponding device model stubdoms) to the E-cores, the P-cores
> will refuse to enter C3 and display 99.81% residency for C2. This happens
> regardless of the number of vCPUs allocated to the HVMs (I tested it with
> just one allocated) nor the workload (it is very light, with barely any CPU
> time shown).
>
> If I fully pause or shut down the HVMs however, C3 jumps up to a much more
> reasonable residency. I am using sched-credit2 as the scheduler with default
> weight and cap values.
>
> Would appreciate any input.
>
> Best,
> Alex
>
