linux-kernel - Re: [PATCH] sched/fair: allow imbalance between LLCs under NUMA

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Message-ID: <4ec144f7-2b07-4d56-93b9-d23dcbe0d6fe@amd.com>
Date: Thu, 19 Jun 2025 12:00:11 +0530
From: K Prateek Nayak <kprateek.nayak@....com>
To: Jianyong Wu <jianyong.wu@...look.com>, Jianyong Wu <wujianyong@...on.cn>,
 mingo@...hat.com, peterz@...radead.org, juri.lelli@...hat.com,
 vincent.guittot@...aro.org
Cc: dietmar.eggemann@....com, rostedt@...dmis.org, bsegall@...gle.com,
 mgorman@...e.de, vschneid@...hat.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] sched/fair: allow imbalance between LLCs under NUMA

Hello Jianyong,

On 6/19/2025 11:38 AM, Jianyong Wu wrote:
> If this change has bad effect for performance, is there any suggestion
> to mitigate the iperf migration issue?

How big of a performance difference are you seeing? I still don't see
any numbers from your testing on the thread.

> Or just leave it there?
  
Ideally, the cache-aware load balancing series [1] should be able to
address these concerns. I suggest testing iperf with those changes and
checking if that solves the issues of excessive migration.

[1] https://lore.kernel.org/lkml/cover.1750268218.git.tim.c.chen@linux.intel.com/

-- 
Thanks and Regards,
Prateek