On Thu, 2016-09-01 at 14:38 +0200, Jesper Dangaard Brouer wrote: > Correction, on the server-under-test, I'm actually running RHEL7.2 > > > > How do I verify/check if I have enabled a cpu-cgroup? > > Hannes says I can look in "/proc/self/cgroup" > > $ cat /proc/self/cgroup > 7:net_cls:/ > 6:blkio:/ > 5:devices:/ > 4:perf_event:/ > 3:cpu,cpuacct:/ > 2:cpuset:/ > 1:name=systemd:/user.slice/user-1000.slice/session-c1.scope > > And that "/" indicate I've not enabled cgroups, right? >
In my experience, I found that times displayed by top are often off for softirq processing. Before applying my patch, top shows very small amount of cpu time for udp_rcv and ksoftirqd/0 , while obviously cpu 0 is completely busy. Make sure to try latest Linus tree, as I did yesterday, because apparently things are better than a few weeks back. BTW, even 'perf top' has sometimes problems showing me cycles spent in softirq. I need to make sure the cpu processing NIC interrupts also spend cycles in some user space program to get meaningful results.
