On 10/28/2016 01:44 AM, Mike Carden wrote: > I bounced this off my 'distro differences' goto guy, Chris Smart. Here are > his thoughts: > > "Run the 14.04 kernel on 16.04 system and re-run the tests to see if it's > kernel related. > > If 16.04 userland with 14.04 kernel is as fast as Ubuntu 14.04, then > compare the kernel .config files to see if there were major changes, > like switching out schedulers.
14.04 with 16.04's kernel is actually just a small amount (~ 3-5%) faster than 14.04 with its standard kernel. > Also, when running the tests on both systems, track cpu usage and number > of threads to see if one has more restrictions than the other. Almost no difference here. > Check swappiness and also "vmstat 1" to see if you're getting more pages > swapped in and out in 16.04. No difference here, either. > I'm assuming that the two virtual machines are identical (CPU type, memory, > threads, virtio, etc)." They are! We've seen this occur in the OpenStack CI jobs (with KVM), and I've also tested this with Xen and bare metal. -- Major Hayden
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