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

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Date:   Mon, 8 Nov 2021 17:21:16 -0600
From:   Steev Klimaszewski <steev@...i.org>
To:     Thara Gopinath <thara.gopinath@...aro.org>,
        Lukasz Luba <lukasz.luba@....com>
Cc:     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 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


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