linux-kernel - Re: [PATCH 00/15] sched: EEVDF and latency-nice and/or slice-attr

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Message-ID: <20231010080155.GB377@noisy.programming.kicks-ass.net>
Date:   Tue, 10 Oct 2023 10:01:55 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Youssef Esmat <youssefesmat@...omium.org>
Cc:     Daniel Jordan <daniel.m.jordan@...cle.com>, mingo@...nel.org,
        vincent.guittot@...aro.org, linux-kernel@...r.kernel.org,
        juri.lelli@...hat.com, dietmar.eggemann@....com,
        rostedt@...dmis.org, bsegall@...gle.com, mgorman@...e.de,
        bristot@...hat.com, corbet@....net, qyousef@...alina.io,
        chris.hyser@...cle.com, patrick.bellasi@...bug.net, pjt@...gle.com,
        pavel@....cz, qperret@...gle.com, tim.c.chen@...ux.intel.com,
        joshdon@...gle.com, timj@....org, kprateek.nayak@....com,
        yu.c.chen@...el.com, joel@...lfernandes.org, efault@....de,
        tglx@...utronix.de
Subject: Re: [PATCH 00/15] sched: EEVDF and latency-nice and/or slice-attr

On Mon, Oct 09, 2023 at 07:51:03PM -0500, Youssef Esmat wrote:

> > Playing around with it a little:
> >
> > EEVDF                                   EVDF
> >
> > slice 30000000                          slice 30000000
> > # Min Latencies: 00014                  # Min Latencies: 00048
> > # Avg Latencies: 00692                  # Avg Latencies: 188239
> > # Max Latencies: 94633                  # Max Latencies: 961241
> >
> > slice 3000000                           slice 3000000
> > # Min Latencies: 00054                  # Min Latencies: 00055
> > # Avg Latencies: 00522                  # Avg Latencies: 00673
> > # Max Latencies: 41475                  # Max Latencies: 13297
> >
> > slice 300000                            slice 300000
> > # Min Latencies: 00018                  # Min Latencies: 00024
> > # Avg Latencies: 00344                  # Avg Latencies: 00056
> > # Max Latencies: 20061                  # Max Latencies: 00860
> >
> 
> Thanks for sharing. Which workload was used to generate these numbers?

This is hackbench vs cyclictest, where cyclictest gets a custom slice
set, the big slice is 10 * normal, the middle slice is normal (equal to
hackbench) and the short slice is normal / 10.