Ubuntu
linux package

  1. Bug #1713576
  2. Comment #9

Comment 9 for bug 1713576

Revision history for this message
bugproxy (bugproxy) wrote : Comment bridged from LTC Bugzilla

------- Comment From <email address hidden> 2017-09-11 15:49 EDT-------
Thanks, I was able to make perf work by uninstalling the "linux-tools-common" test .deb and installing the stock version.

This test build resolves the problem by significantly reducing sched migrations in the under utilized case which improves performance by 30-40% for this ebizzy testcase:

stock kernel (4.10.0-33-generic) :
6,010 sched:sched_migrate_task

test kernel (4.10.0-33-generic #37~lp1713576) :
676 sched:sched_migrate_task

Testcase was:
perf stat -a -r 5 -e sched:sched_migrate_task ./ebizzy -t 35 -S 100

where ebizzy was using 35 threads on a system w/ 128 logical cpus total