[SPDK] Re: The power consumption of spdk framework.

Hi Vincent,

I want to add a comment.

As we had a few talks on Slack, the current idea is not automatic and covers only configuration changes.
We may need to use something like
https://doc.dpdk.org/guides/prog_guide/power_man.html
43. Power Management — Data Plane Development Kit 20.02.0 documentation - DPDK<https://doc.dpdk.org/guides/prog_guide/power_man.html>
43.2. Core-load Throttling through C-States. Core state can be altered by speculative sleeps whenever the specified lcore has nothing to do. In the DPDK, if no packet is received after polling, speculative sleeps can be triggered according the strategies defined by the user space application.
doc.dpdk.org
https://doc.dpdk.org/guides/sample_app_ug/l3_forward_power_man.html
22. L3 Forwarding with Power Management Sample Application — Data Plane Development Kit 20.02.0-rc1 documentation - DPDK<https://doc.dpdk.org/guides/sample_app_ug/l3_forward_power_man.html>
22.1. Introduction. The L3 Forwarding with Power Management application is an example of power-aware packet processing using the DPDK. The application is based on existing L3 Forwarding sample application, with the power management algorithms to control the P-states and C-states of the Intel processor via a power management library.
doc.dpdk.org

I have not investigated in detail yet though.

I have just started and so your any interest and input are very appreciated.

Thanks,
Shuhei


________________________________
差出人: Vincent <cockroach1136(a)gmail.com>
送信日時: 2020年3月5日 18:45
宛先: Storage Performance Development Kit <spdk(a)lists.01.org>
件名: [!][SPDK] Re: The power consumption of spdk framework.

Thank you so much for your response.

松本周平 / MATSUMOTO，SHUUHEI <shuhei.matsumoto.xt(a)hitachi.com> 於 2020年3月5日 週四
上午10:51寫道：

> Hi Vincent,
>
> An idea is out there now.
>
> The current idea is to migrate SPDK threads among CPU cores and create
> idle reactor.
> Idle reactor sleeps until any thread runs on it.
>
> Related patche is https://clicktime.symantec.com/3Mv6ymv82pF8Qpw7hh4N1Su7Vc?u=https%3A%2F%2Freview.spdk.io%2Fgerrit%2Fc%2Fspdk%2Fspdk%2F%2B%2F1049 to
> sleep idle reactors.
> The recently added thread_set_cpumask can migrate SPDK thread among CPU
> cores.
>
> We discussed this topic in the last community meeting. Please check this
> together if you have interest.
>
> https://clicktime.symantec.com/3KHNFPYa6mHB2GUnEnMXU3X7Vc?u=https%3A%2F%2Ftrello.com%2Fc%2FJndSGRoW%2F277-simple-cpu-core-parking-when-reactor-has-no-threads
> Trello<
> https://clicktime.symantec.com/3KHNFPYa6mHB2GUnEnMXU3X7Vc?u=https%3A%2F%2Ftrello.com%2Fc%2FJndSGRoW%2F277-simple-cpu-core-parking-when-reactor-has-no-threads
> >
> Organize anything, together. Trello is a collaboration tool that organizes
> your projects into boards. In one glance, know what's being worked on,
> who's working on what, and where something is in a process.
> trello.com
>
>
> Thanks,
> Shuhei
>
>
>
> ________________________________
> 差出人: Vincent <cockroach1136(a)gmail.com>
> 送信日時: 2020年3月5日 11:38
> 宛先: Storage Performance Development Kit <spdk(a)lists.01.org>
> 件名: [SPDK] The power consumption of spdk framework.
>
> Hello all,
>    We know when spdk start, The cpu-core used by spdk usage will become
> 100% due to busy loop of reactor.  I remember this topic has been discussed
> before. But I forget the conclusion. I cannot find out the conclusion in
> the internet and maillist too.
>
>     Does anyone can provide me the information about this topic ??
> Can spdk avoid the cpu usage 100% when idle now??
>
> Thank you so much.
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