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From: Andrea Righi <arighi@nvidia.com>
To: Christian Loehle <christian.loehle@arm.com>
Cc: Vincent Guittot <vincent.guittot@linaro.org>,
	peterz@infradead.org, dietmar.eggemann@arm.com,
	valentin.schneider@arm.com, mingo@redhat.com,
	rostedt@goodmis.org, segall@google.com, mgorman@suse.de,
	catalin.marinas@arm.com, will@kernel.org, sudeep.holla@arm.com,
	rafael@kernel.org, linux-pm@vger.kernel.org,
	linux-kernel@vger.kernel.org, juri.lelli@redhat.com,
	kobak@nvidia.com, fabecassis@nvidia.com
Subject: Re: [RFC][RFT][PATCH 0/3] arm64: Enable asympacking for minor CPPC asymmetry
Date: Fri, 27 Mar 2026 10:53:21 +0100	[thread overview]
Message-ID: <acZTkYoPmTkEdlzo@gpd4> (raw)
In-Reply-To: <3a1ecb19-779a-418a-bc87-033d16905b46@arm.com>

Hi Christian,

On Thu, Mar 26, 2026 at 03:55:54PM +0000, Christian Loehle wrote:
...
> > Right, the issue I'm trying to solve is SD_ASYM_CPUCAPACITY + SMT. Removing
> > SD_ASYM_CPUCAPACITY from the equation fixes my issue, because we fall back
> > into the regular idle CPU selection policy, which avoids allocating both
> > SMT siblings when possible.
> > 
> > Thanks,
> > -Andrea
> 
> Could you also report how Grace baseline vs ASYM_PACKING works for your
> benchmark? (or Vera nosmt)
> 

I've done some tests with Vera nosmt. I don't see much difference with
ASYM_PACKING vs ASYM_CPUCAPACITY (baseline), pretty much in error range (I
see around 1-2% difference across runs, but there's not a clear bias
between the two solutions).

I'll try to find a Grace system and repeat the tests there as well.

Thanks,
-Andrea

  parent reply	other threads:[~2026-03-27  9:53 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-03-25 18:13 [RFC][RFT][PATCH 0/3] arm64: Enable asympacking for minor CPPC asymmetry Christian Loehle
2026-03-25 18:13 ` [PATCH 1/3] sched/topology: Introduce arch hooks for asympacking Christian Loehle
2026-03-26 13:23   ` kernel test robot
2026-03-26 15:26   ` kernel test robot
2026-03-26 16:40   ` kernel test robot
2026-03-25 18:13 ` [PATCH 2/3] arch_topology: Export CPPC-based asympacking prios Christian Loehle
2026-03-25 18:13 ` [PATCH 3/3] arm64/sched: Enable CPPC-based asympacking Christian Loehle
2026-03-26 15:47   ` kernel test robot
2026-03-26 15:47   ` kernel test robot
2026-03-27 15:44   ` Valentin Schneider
2026-03-29 17:49     ` Christian Loehle
2026-03-26  7:53 ` [RFC][RFT][PATCH 0/3] arm64: Enable asympacking for minor CPPC asymmetry Vincent Guittot
2026-03-26  8:16   ` Christian Loehle
2026-03-26  8:24     ` Vincent Guittot
2026-03-26  9:24       ` Christian Loehle
2026-03-26 13:04         ` Vincent Guittot
2026-03-26 13:45           ` Andrea Righi
2026-03-26 15:55             ` Christian Loehle
2026-03-26 16:00               ` Andrea Righi
2026-03-27  9:53               ` Andrea Righi [this message]
2026-03-26  8:20   ` Christian Loehle
2026-03-26  8:11 ` Andrea Righi
2026-03-26  8:20   ` Vincent Guittot
2026-03-26  9:15     ` Andrea Righi

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