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From: "Michal Koutný" <mkoutny@suse.com>
To: Felix Moessbauer <felix.moessbauer@siemens.com>
Cc: longman@redhat.com, akpm@linux-foundation.org,
	cgroups@vger.kernel.org, corbet@lwn.net, frederic@kernel.org,
	guro@fb.com, hannes@cmpxchg.org, juri.lelli@redhat.com,
	linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-kselftest@vger.kernel.org, lizefan.x@bytedance.com,
	mtosatti@redhat.com, pauld@redhat.com, peterz@infradead.org,
	shuah@kernel.org, tj@kernel.org, jan.kiszka@siemens.com,
	henning.schild@siemens.com
Subject: Re: [PATCH v8 0/6] cgroup/cpuset: Add new cpuset partition type & empty effecitve cpus
Date: Wed, 10 Nov 2021 14:56:53 +0100	[thread overview]
Message-ID: <20211110135653.GD20566@blackbody.suse.cz> (raw)
In-Reply-To: <20211110111357.17617-1-felix.moessbauer@siemens.com>

Hello.

On Wed, Nov 10, 2021 at 12:13:57PM +0100, Felix Moessbauer <felix.moessbauer@siemens.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

  parent reply	other threads:[~2021-11-10 13:57 UTC|newest]

Thread overview: 39+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-10-18 14:36 [PATCH v8 0/6] cgroup/cpuset: Add new cpuset partition type & empty effecitve cpus Waiman Long
2021-10-18 14:36 ` [PATCH v8 1/6] cgroup/cpuset: Allow no-task partition to have empty cpuset.cpus.effective Waiman Long
2021-10-18 14:36 ` [PATCH v8 2/6] cgroup/cpuset: Refining features and constraints of a partition Waiman Long
2021-10-18 14:36 ` [PATCH v8 3/6] cgroup/cpuset: Add a new isolated cpus.partition type Waiman Long
2021-10-18 14:36 ` [PATCH v8 4/6] cgroup/cpuset: Show invalid partition reason string Waiman Long
2021-10-18 14:36 ` [PATCH v8 5/6] cgroup/cpuset: Update description of cpuset.cpus.partition in cgroup-v2.rst Waiman Long
2021-11-15 19:31   ` Michal Koutný
2021-11-15 20:11     ` Tejun Heo
2021-11-15 21:27       ` Waiman Long
2021-11-15 21:10     ` Waiman Long
2021-11-16 17:54       ` Michal Koutný
2021-11-30 15:35         ` Waiman Long
2021-11-30 17:11           ` Tejun Heo
2021-12-01  3:56             ` Waiman Long
2021-12-01 14:13               ` Michal Koutný
2021-12-01 14:56                 ` Waiman Long
2021-12-01 16:39                   ` Tejun Heo
2021-12-01 17:49                     ` Waiman Long
2021-12-01 14:26               ` Waiman Long
2021-12-01 16:46               ` Tejun Heo
2021-12-01 18:05                 ` Waiman Long
2021-12-02  1:28                   ` Waiman Long
2021-12-03 18:25                     ` Michal Koutný
2021-12-03 19:27                       ` Waiman Long
2021-10-18 14:36 ` [PATCH v8 6/6] kselftest/cgroup: Add cpuset v2 partition root state test Waiman Long
2021-10-27 23:05 ` [PATCH v8 0/6] cgroup/cpuset: Add new cpuset partition type & empty effecitve cpus Waiman Long
2021-11-10 11:13 ` Felix Moessbauer
2021-11-10 13:21   ` Marcelo Tosatti
2021-11-10 13:56   ` Michal Koutný [this message]
2021-11-10 15:21     ` Moessbauer, Felix
2021-11-10 16:10       ` Marcelo Tosatti
2021-11-10 16:14         ` Marcelo Tosatti
2021-11-10 16:15         ` Jan Kiszka
2021-11-10 17:29           ` Marcelo Tosatti
2021-11-10 18:30             ` Waiman Long
2021-11-10 17:52           ` Michal Koutný
2021-11-10 18:04             ` Jan Kiszka
2021-11-10 18:15       ` Michal Koutný
2021-11-10 15:20   ` Waiman Long

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