linux-kernel - Re: [PATCH v8 0/6] cgroup/cpuset: Add new cpuset partition type & empty effecitve cpus

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Message-ID: <20211110135653.GD20566@blackbody.suse.cz>
Date:   Wed, 10 Nov 2021 14:56:53 +0100
From:   Michal Koutný <mkoutny@...e.com>
To:     Felix Moessbauer <felix.moessbauer@...mens.com>
Cc:     longman@...hat.com, akpm@...ux-foundation.org,
        cgroups@...r.kernel.org, corbet@....net, frederic@...nel.org,
        guro@...com, hannes@...xchg.org, juri.lelli@...hat.com,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-kselftest@...r.kernel.org, lizefan.x@...edance.com,
        mtosatti@...hat.com, pauld@...hat.com, peterz@...radead.org,
        shuah@...nel.org, tj@...nel.org, jan.kiszka@...mens.com,
        henning.schild@...mens.com
Subject: Re: [PATCH v8 0/6] cgroup/cpuset: Add new cpuset partition type &
 empty effecitve cpus

Hello.

On Wed, Nov 10, 2021 at 12:13:57PM +0100, Felix Moessbauer <felix.moessbauer@...mens.com> wrote:
> However, I was not able to see any latency improvements when using
> cpuset.cpus.partition=isolated.

Interesting. What was the baseline against which you compared it
(isolcpus, no cpusets,...)?

> The test was performed with jitterdebugger on CPUs 1-3 and the following cmdline:
> rcu_nocbs=1-4 nohz_full=1-4 irqaffinity=0,5-6,11 intel_pstate=disable
> On the other cpus, stress-ng was executed to generate load.
> [...]

> This requires cgroup.type=threaded on both cgroups and changes to the application
> (threads have to be born in non-rt group and moved to rt-group).

But even with isolcpus the application would need to set affinity of
threads to the selected CPUs (cf cgroup migrating). Do I miss anything?

Thanks,
Michal