[Eas-dev] EAS behavior and lack of idle states in SoC

Hi ARM folks!

I have some work to do with EAS + IPA. I have a platform with arm64 4 big + 4 LITTLE that will hopefully get EAS and IPA (when I solve some thermal issues). Unfortunately, in this SoC and code we don't have idle states (new SoCs will just get normal psci support). I run different kernel versions, also your latest integration-next (after dropping whole /drivers/usb because the changes in that branch broke it).

Have you ever tried to evaluate EAS on a platform which has only WFI idle? Do you know what could be the impact on the EAS? I have some other thought and issues to discuss regarding EAS (migrations, load balancing, etc) but this question regarding idle is probably fundamental.

Cheers, Lukasz Luba