linux-kernel - Re: [PATCH 0/4] arm64: dts: qcom: x1e80100: Enable bwmon and fastrpc support

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Date: Thu, 13 Jun 2024 22:57:59 +0530
From: Sibi Sankar <quic_sibis@...cinc.com>
To: Konrad Dybcio <konrad.dybcio@...aro.org>, <andersson@...nel.org>,
        <djakov@...nel.org>, <robh+dt@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>, <srinivas.kandagatla@...aro.org>
CC: <linux-kernel@...r.kernel.org>, <linux-arm-msm@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-pm@...r.kernel.org>,
        <quic_rgottimu@...cinc.com>, <quic_kshivnan@...cinc.com>,
        <conor+dt@...nel.org>, <dmitry.baryshkov@...aro.org>,
        <abel.vesa@...aro.org>
Subject: Re: [PATCH 0/4] arm64: dts: qcom: x1e80100: Enable bwmon and fastrpc
 support



On 6/6/24 16:00, Konrad Dybcio wrote:
> On 4.06.2024 3:11 AM, Sibi Sankar wrote:
>> This patch series enables bwmon and fastrpc support on X1E80100 SoCs.
>>
>> This series applies on:
>> next-20240603 + https://lore.kernel.org/lkml/20240603205859.2212225-1-quic_sibis@quicinc.com/
>>
> 
> Going back to [1], is memlat-over-scmi not enough to give us good numbers
> without OS intervention? Does probing bwmon and making some decisions in
> Linux actually help here?

Memlat and bwmon are meant to cover to different use cases. Though
they have a big overlap on when they get triggered bwmon is specifically
meant to address cases where band-width aggregation is required (meaning
if other peripherals already have a avg bw vote on active LLCC/DDR, the
vote from bwmon would be an additional request on top of that). However
to make use of this we should vote for avg-kbps in addition to peak from
icc-bwmon driver which we don't currently do (Shiv was planning on
sending a fix for it).

-Sibi

> 
> Konrad
> 
> [1] https://lore.kernel.org/all/20240117173458.2312669-1-quic_sibis@quicinc.com/