From: Ramses <ramses@well-founded.dev>
To: Tim Chen <tim.c.chen@linux.intel.com>
Cc: Bagas Sanjaya <bagasdotme@gmail.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Linux Regressions <regressions@lists.linux.dev>,
Linux Power Management <linux-pm@vger.kernel.org>,
"Rafael J. Wysocki" <rafael@kernel.org>,
Viresh Kumar <viresh.kumar@linaro.org>,
Ingo Molnar <mingo@redhat.com>,
Peter Zijlstra <peterz@infradead.org>,
Juri Lelli <juri.lelli@redhat.com>,
Vincent Guittot <vincent.guittot@linaro.org>,
Yu Chen <yu.c.chen@intel.com>,
Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Subject: Re: Fwd: Intel hybrid CPU scheduler always prefers E cores
Date: Wed, 29 Nov 2023 00:17:47 +0100 (CET) [thread overview]
Message-ID: <NkNDM2v--B-9@well-founded.dev> (raw)
In-Reply-To: <c2a9ceb3d7b1f384ad94d10b7058bb1cebea3d07.camel@linux.intel.com>
Nov 29, 2023, 00:10 by tim.c.chen@linux.intel.com:
> On Tue, 2023-11-28 at 23:33 +0100, Ramses wrote:
>
>> I applied the patch on top of 6.6.2, but unfortunately I see more or less the same behaviour as before, with single-threaded CPU-bound tasks running almost exclusively on E cores.
>>
>> Ramses
>>
>
> I suspect that you may have other issues. I wonder if CPU priorities are getting
> assigned properly on your system.
>
> Saw in the original bugzilla
> https://bugzilla.kernel.org/show_bug.cgi?id=218195
> that you don't see /proc/sys/kernel/sched_itmt_enabled which
> may be a symptom of such a problem.
>
> +Srinivas, is there something Ramses can do to help
> find out if there are issues with cppc?
>
> Tim
>
Yeah I'm getting the impression that something is going wrong on my system. AFAIU, itmt is supposed to be auto-detected and doesn't require additional config?
I have the intel ME disabled on my CPU (it came like that from the OEM), I don't know if that can have an effect?
Let me know if there's any additional info that I can provide.
Ramses
next prev parent reply other threads:[~2023-11-28 23:17 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-11-28 13:22 Fwd: Intel hybrid CPU scheduler always prefers E cores Bagas Sanjaya
2023-11-28 14:02 ` Peter Zijlstra
2023-11-28 14:19 ` Bagas Sanjaya
2023-12-18 16:11 ` Ricardo Neri
2023-11-28 17:33 ` Tim Chen
2023-11-28 22:37 ` Ramses
[not found] ` <NkN3JYx--3-9@well-founded.dev>
2023-11-28 23:10 ` Tim Chen
2023-11-28 23:17 ` Ramses [this message]
2023-11-29 15:05 ` srinivas pandruvada
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