[REGRESSION] sched/fair: Add lag based placement

From: Joseph Salisbury
Date: Wed Nov 13 2024 - 13:05:48 EST


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