Messages in this thread | | | Date | Mon, 4 Apr 2022 17:24:06 -0700 | Subject | Re: [PATCH v3 2/3] x86/fpu: Add a helper to prepare AMX state for low-power CPU idle | From | "Chang S. Bae" <> |
| |
On 4/3/2022 9:37 AM, Thomas Gleixner wrote: > On Thu, Mar 24 2022 at 19:22, Chang S. Bae wrote: >> When a CPU enters an idle state, non-initialized states left in large >> registers may be the cause of preventing deeper low-power states. >> >> The new helper ensures the AMX state is initialized to make the CPU >> ready for low-power states. It will be used by the intel idle driver. > > What about AVX...AVX512? Are they harmless in that regard?
I double-checked with HW folks. Yes, that's the case. Their state whether initialized or not does not prevent the processor from entering a deeper low-power state.
> > If so, then the first sentence above is confusing and should clearly > spell out that it's AMX which causes that problem.
I see. Will do that.
Thanks, Chang
| |