linux-kernel - Re: [PATCH 0/2] Fix NUMA sched domain build errors for GNR-X and CWF-X

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Message-ID: <23c06fbda6e18354eaf253abb6b106292b69bdde.camel@linux.intel.com>
Date: Mon, 25 Aug 2025 14:38:42 -0700
From: Tim Chen <tim.c.chen@...ux.intel.com>
To: K Prateek Nayak <kprateek.nayak@....com>, Peter Zijlstra
	 <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>
Cc: Juri Lelli <juri.lelli@...hat.com>, Dietmar Eggemann
 <dietmar.eggemann@....com>, Ben Segall <bsegall@...gle.com>, Mel Gorman
 <mgorman@...e.de>, Valentin Schneider <vschneid@...hat.com>, Tim Chen
 <tim.c.chen@...el.com>, Vincent Guittot <vincent.guittot@...aro.org>, Libo
 Chen <libo.chen@...cle.com>, Abel Wu <wuyun.abel@...edance.com>, Len Brown
 <len.brown@...el.com>, linux-kernel@...r.kernel.org, Chen Yu
 <yu.c.chen@...el.com>,  "Gautham R . Shenoy" <gautham.shenoy@....com>, Zhao
 Liu <zhao1.liu@...el.com>, Vinicius Costa Gomes <vinicius.gomes@...el.com>
Subject: Re: [PATCH 0/2] Fix NUMA sched domain build errors for GNR-X and
 CWF-X

On Mon, 2025-08-25 at 09:48 +0530, K Prateek Nayak wrote:
> Hello Tim,
> 
> On 8/23/2025 1:44 AM, Tim Chen wrote:
> > While testing Granite Rapids X (GNR-X) and Clearwater Forest X (CWF-X) in
> > SNc-3 mode, we encountered sched domain build errors reported in dmesg.
> > Asymmetric node distances from local node to to nodes in remote package
> > was not expected by the scheduler domain code and also led to excessive
> > number of sched domain hierachy levels.
> > 
> > Fix the missing NUMA domain level set in topology_span_sane() check and
> > also simplify the distance to nodes in remote package to retain distance
> > symmetry and make the NUMA topology sane for GNR-X and CWF-X.
> 
> I did some sanity testing on an EPYC platform  on NPS2/4 and didn't
> see any changes to the sched domain layout or the sched_node_distance()
> being used when constructing them with the series.
> 
> Feel free to include:
> 
> Tested-by: K Prateek Nayak <kprateek.nayak@....com>
> 

Thanks for testing it.

Tim