lkml.org 
[lkml]   [2020]   [Nov]   [16]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH v3 3/3] [RFC] CPUFreq: Add support for cpu-perf-dependencies
From
Date


On 11/9/20 6:57 AM, Viresh Kumar wrote:
> On 06-11-20, 11:14, Lukasz Luba wrote:
>> I also had similar doubts, because if we make frequency requests
>> independently for each CPU, why not having N cooling devs, which
>> will set independently QoS max freq for them...
>>
>> What convinced me:
>> EAS and FIE would know the 'real' frequency of the cluster, IPA
>> can use it also and have only one cooling device per cluster.
>>
>> We would like to keep this old style 'one cooling device per cpuset'.
>> I don't have strong opinion and if it would appear that there are
>> some errors in freq estimation for cluster, then maybe it does make
>> more sense to have cdev per CPU...
>
> Let me rephrase my question. What is it that doesn't work _correctly_
> with cdev per cpufreq policy in your case? What doesn't work well if
> the thermal stuff keeps looking at only the related_cpus thing and not
> the cpu-perf-dependencies thing?
>

We don't have a platform which would be this per-cpu freq request, yet.
Thus it's hard to answer your question. The EAS would work in 'old
style' - cluster mode. I don't know how IPA would work on such HW
and SW configuration. To figure this out I need a real platform.

\
 
 \ /
  Last update: 2020-11-16 12:34    [W:0.094 / U:2.184 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site