[Ksummit-discuss] [TECH TOPIC] benchmarking and performance trends

Davidlohr Bueso dave at stgolabs.net
Fri Jul 17 21:22:24 UTC 2015


On Wed, 2015-07-15 at 11:37 -0400, Chris Mason wrote:
> We're starting to push 4.0 into prod (122 hosts almost counts), and I'm
> sure we'll backport some wins from 4.2+.  I'm hoping to make this a
> collection point for other benchmarking war stories.  Our biggest gains
> right now are coming from scsi-mq, and early benchmarks show 4.2 has a
> boost that I'm hoping are from the futex locking improvements.

At least for 4.2 you might also want to keep an eye out for the new
qspinlock stuff. Which could be another source of the performance boost
you are seeing. Of course I have no idea what your workload does other
than suffer from futexes.



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