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From: Andy Lutomirski <>
To: Ingo Molnar <>,
	Peter Zijlstra <>,
	"" <>
Subject: Abysmal scheduler performance in Linus' tree?
Date: Tue, 5 Sep 2017 22:13:39 -0700
Message-ID: <> (raw)

I'm running e7d0c41ecc2e372a81741a30894f556afec24315 from Linus' tree
today, and I'm seeing abysmal scheduler performance.  Running make -j4
ends up with all the tasks on CPU 3 most of the time (on my
4-logical-thread laptop).  taskset -c 0 whatever puts whatever on CPU
0, but plain while true; do true; done puts the infinite loop on CPU 3
right along with the make -j4 tasks.

This is on Fedora 26, and I don't think I'm doing anything weird.
systemd has enabled the cpu controller, but it doesn't seem to have
configured anything or created any non-root cgroups.

Just a heads up.  I haven't tried to diagnose it at all.

             reply index

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-09-06  5:13 Andy Lutomirski [this message]
2017-09-06  8:25 ` Peter Zijlstra
2017-09-06  8:59   ` Andy Lutomirski
2017-09-06  9:03     ` Peter Zijlstra
2017-09-06 16:14       ` Peter Zijlstra
2017-09-07  6:15         ` Mike Galbraith
2017-09-07  7:31           ` Ingo Molnar
2017-09-07  9:13           ` [PATCH] sched/cpuset/pm: Fix cpuset vs suspend-resume Peter Zijlstra
2017-09-07  9:26             ` Peter Zijlstra
2017-09-07 10:54               ` Rafael J. Wysocki
2017-09-07 20:38               ` Tejun Heo
2017-09-07 10:33             ` [tip:sched/urgent] sched/cpuset/pm: Fix cpuset vs. suspend-resume bugs tip-bot for Peter Zijlstra
2017-09-06  9:15 ` Abysmal scheduler performance in Linus' tree? Chris Wilson
2017-09-06  9:24   ` Peter Zijlstra
     [not found]     ` <>
2017-09-06 10:44       ` Peter Zijlstra
2017-09-06 10:51         ` Peter Zijlstra
2017-09-07  8:16           ` [tip:sched/urgent] sched/fair: Fix wake_affine_llc() balancing rules tip-bot for Peter Zijlstra

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