linux-kernel - [REGRESSION] sched/fair: Add lag based placement

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Message-ID: <58289b1c-8a56-4607-8632-d36aef1fc5dd@oracle.com>
Date: Wed, 13 Nov 2024 13:03:00 -0500
From: Joseph Salisbury <joseph.salisbury@...cle.com>
To: peterz@...radead.org, mingo@...nel.org
Cc: juri.lelli@...hat.com, vincent.guittot@...aro.org,
        dietmar.eggemann@....com, Steven Rostedt <rostedt@...dmis.org>,
        bsegall@...gle.com, mgorman@...e.de, vschneid@...hat.com,
        linux-kernel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [REGRESSION] sched/fair: Add lag based placement

Hello,

During performance testing, we found a regression of ~9% performance 
with the TPCC benchmark.   This performance regression was introduced in 
v6.6-rc1.  After a bisect, the following commit was identified as the 
cause of the regression:

86bfbb7ce4f6 ("sched/fair: Add lag based placement")

I was hoping to get some feedback from the scheduler folks.  Do you 
think gathering any additional data will help diagnose this issue?  Are 
there any tunable options that can changed to see how performance is 
affected?

Thanks,

Joe