linux-kernel - Re: [PATCH v7] sched: Consolidate cpufreq updates

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Message-ID: <ae65e4aa-3407-4fb0-b1f1-eb7c2626f768@linux.ibm.com>
Date: Mon, 7 Oct 2024 22:50:11 +0530
From: Anjali K <anjalik@...ux.ibm.com>
To: Qais Yousef <qyousef@...alina.io>,
        "Rafael J. Wysocki"
 <rafael@...nel.org>,
        Viresh Kumar <viresh.kumar@...aro.org>, Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Juri Lelli <juri.lelli@...hat.com>
Cc: Steven Rostedt <rostedt@...dmis.org>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Ben Segall
 <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>,
        Valentin Schneider <vschneid@...hat.com>,
        Christian Loehle <christian.loehle@....com>,
        Hongyan Xia <hongyan.xia2@....com>, John Stultz <jstultz@...gle.com>,
        linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v7] sched: Consolidate cpufreq updates

Hi, I tested this patch to see if it causes any regressions on bare-metal power9 systems with microbenchmarks.
The test system is a 2 NUMA node 128 cpu powernv power9 system. The conservative governor is enabled.
I took the baseline as the 6.10.0-rc1 tip sched/core kernel.
No regressions were found.

+------------------------------------------------------+--------------------+----------+
|                     Benchmark                        |      Baseline      | Baseline |
|                                                      |  (6.10.0-rc1 tip   | + patch  |
|                                                      |  sched/core)       |          |
+------------------------------------------------------+--------------------+----------+
|Hackbench run duration (sec)                          |         1          |   1.01   |
|Lmbench simple fstat (usec)                           |         1          |   0.99   |
|Lmbench simple open/close (usec)                      |         1          |   1.02   |
|Lmbench simple read (usec)                            |         1          |   1      |
|Lmbench simple stat (usec)                            |         1          |   1.01   |
|Lmbench simple syscall (usec)                         |         1          |   1.01   |
|Lmbench simple write (usec)                           |         1          |   1      |
|stressng (bogo ops)                                   |         1          |   0.94   |
|Unixbench execl throughput (lps)                      |         1          |   0.97   |
|Unixbench Pipebased Context Switching throughput (lps)|         1          |   0.94   |
|Unixbench Process Creation (lps)                      |         1          |   1      |
|Unixbench Shell Scripts (1 concurrent) (lpm)          |         1          |   1      |
|Unixbench Shell Scripts (8 concurrent) (lpm)          |         1          |   1.01   |
+------------------------------------------------------+--------------------+----------+

Thank you,
Anjali K