linux-kernel - Re: [PATCH v3 0/5] Refactor thermal pressure update to avoid code duplication

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Date:   Tue, 9 Nov 2021 08:29:21 +0000
From:   Lukasz Luba <lukasz.luba@....com>
To:     Steev Klimaszewski <steev@...i.org>
Cc:     Thara Gopinath <thara.gopinath@...aro.org>,
        linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-arm-msm@...r.kernel.org, sudeep.holla@....com,
        will@...nel.org, catalin.marinas@....com, linux@...linux.org.uk,
        gregkh@...uxfoundation.org, rafael@...nel.org,
        viresh.kumar@...aro.org, amitk@...nel.org,
        daniel.lezcano@...aro.org, amit.kachhap@...il.com,
        bjorn.andersson@...aro.org, agross@...nel.org
Subject: Re: [PATCH v3 0/5] Refactor thermal pressure update to avoid code
 duplication

Hi Steev,

That's interesting what you've done with Rockchip RK3399.
I would like to reproduce your experiment on my RockPI 4B v1.3.
Could you tell me how you to add this boost frequency that you have
mentioned in some previous emails?

I want to have similar setup to yours and I'll check all the subsystems
involved in the decision making process for triggering this boost freq.

On 11/8/21 11:21 PM, Steev Klimaszewski wrote:
> Hi Thara,
>> Hi Steev,
>>
>> IIUC, PineBook Pro has Rockchip RK3399 which has 2 Cortex A-72 and 4 
>> Cortex A-52 where as C630 has Qualcomm sdm845 which has 4 Cortex A-75 
>> and 4 Cortex A-55. Task placements and subsequently cpu load will be 
>> different for both the platforms. With the same workload, I will 
>> expect Rockchip to system to be more loaded than sdm845. Having said 
>> that, what cpu-freq governor are you using on both the systems.
>>
> I'm using sched-util on both of the systems.
> 
> I've tried a number of different ways of forcing builds only on the A-75 
> cores, and I simply cannot get the load to be "enough" to kick in the 
> boost frequency.
> 
> An example being
> 
> git clone https://github.com/zellij-org/zellij.git
> 
> cd zellij
> 
> taskset --cpu-list 4-7 cargo build --release
> 
> git clean -fdx
> 
> taskset --cpu-list 6-7 cargo build --release

Thanks for the pointers, I'll give it a try when I sort out this
Rockchip boost setup.

> 
> 
> On my C630, it never goes higher than 85C with the 4 cores being used, 
> and with 2, it never goes about 65C and I do not get any 2.96GHz.  It's 
> currently sitting at "6" in the time_in_state for 2965800.
> 
> 
> --steev
> 

Thank you for your support.

Regards,
Lukasz