On Thu, 1 Sep 2016 14:29:25 +0200 Jesper Dangaard Brouer <bro...@redhat.com> wrote:
> On Thu, 1 Sep 2016 13:53:56 +0200 > Peter Zijlstra <pet...@infradead.org> wrote: > > > On Thu, Sep 01, 2016 at 01:02:31PM +0200, Jesper Dangaard Brouer wrote: > > > PID S %CPU TIME+ COMMAND > > > 3 R 50.0 29:02.23 ksoftirqd/0 > > > 10881 R 10.7 1:01.61 udp_sink > > > 10837 R 10.0 1:05.20 udp_sink > > > 10852 S 10.0 1:01.78 udp_sink > > > 10862 R 10.0 1:05.19 udp_sink > > > 10844 S 9.7 1:01.91 udp_sink > > > > > > This is strange, why is ksoftirqd/0 getting 50% of the CPU time??? > > > > Do you run your udp_sink thingy in a cpu-cgroup? > > That was also Paolo's feedback (IRC). I'm not aware of it, but it > might be some distribution (Fedora 22) default thing. 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? -- Best regards, Jesper Dangaard Brouer MSc.CS, Principal Kernel Engineer at Red Hat Author of http://www.iptv-analyzer.org LinkedIn: http://www.linkedin.com/in/brouer
