linux-kernel - Re: [RFC PATCH 3/3] sched: Implement shared wakequeue in CFS

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Date:   Tue, 13 Jun 2023 10:32:03 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     David Vernet <void@...ifault.com>
Cc:     linux-kernel@...r.kernel.org, mingo@...hat.com,
        juri.lelli@...hat.com, vincent.guittot@...aro.org,
        rostedt@...dmis.org, dietmar.eggemann@....com, bsegall@...gle.com,
        mgorman@...e.de, bristot@...hat.com, vschneid@...hat.com,
        joshdon@...gle.com, roman.gushchin@...ux.dev, tj@...nel.org,
        kernel-team@...a.com
Subject: Re: [RFC PATCH 3/3] sched: Implement shared wakequeue in CFS


Still gotta read it properly, however:

On Tue, Jun 13, 2023 at 12:20:04AM -0500, David Vernet wrote:
> Single-socket | 32-core | 2-CCX | AMD 7950X Zen4
> Single-socket | 72-core | 6-CCX | AMD Milan Zen3
> Single-socket | 176-core | 11-CCX | 2-CCX per CCD | AMD Bergamo Zen4c

Could you please also benchmark on something Intel that has these stupid
large LLCs ?

Because the last time I tried something like this, it came apart real
quick. And AMD has these relatively small 8-core LLCs.