linux-kernel - Re: [RFC PATCH v4 00/19] Core scheduling v4

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Date:   Thu, 6 Feb 2020 17:37:30 -0500
From:   Julien Desfossez <jdesfossez@...italocean.com>
To:     Tim Chen <tim.c.chen@...ux.intel.com>
Cc:     Vineeth Remanan Pillai <vpillai@...italocean.com>,
        Nishanth Aravamudan <naravamudan@...italocean.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Paul Turner <pjt@...gle.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Linux List Kernel Mailing <linux-kernel@...r.kernel.org>,
        Dario Faggioli <dfaggioli@...e.com>,
        Frédéric Weisbecker <fweisbec@...il.com>,
        Kees Cook <keescook@...omium.org>,
        Greg Kerr <kerrnel@...gle.com>, Phil Auld <pauld@...hat.com>,
        Aaron Lu <aaron.lwe@...il.com>,
        Aubrey Li <aubrey.intel@...il.com>,
        Valentin Schneider <valentin.schneider@....com>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>,
        Paolo Bonzini <pbonzini@...hat.com>
Subject: Re: [RFC PATCH v4 00/19] Core scheduling v4

On 05-Feb-2020 04:28:18 PM, Tim Chen wrote:
> Have you guys been able to make progress on the issues with I/O intensive workload?

Hi Tim,

We are in the process of retesting everything with the following branch:
https://github.com/digitalocean/linux-coresched/tree/coresched/v4-v5.5.y

The CPU-intensive case that becomes overcommitted when we disable SMT
behaves the same as before (core scheduling is a clear win there). So we
are now digging a bit more in our mixed tests with CPU and IO (MySQL
benchmark running in parallel with low-activity VMs). The tests are
still running, but I expect to be able to present some numbers tomorrow.

We will keep the list informed.

Julien