I have verified the above results in a virtual machine, netperf, and netserver were both showing 41-42% cpu usage while per cpu usage were showing 63-65%.
I also verified this with 3.10-rc6. I also did a test, which was to run taskset -c 1 nice 19 stress -c 1 while running the above netperf. I discovered that the time spent on the netperf task dropped to 30% while the cpu usage on the netserver stayed at 50%. Leading me to believe that the per process usage is being reported higher than it should be. I also ran a test to verify that top is correctly reporting values as spit out from /proc/ while(true) do cat stat >> /tmp/stat; cat /proc/[pid of netserver]/stat >> /tmp/stat ; cat /proc/[pid of netperf]/stat >> /tmp/stat; sleep 2s ; done Attached is the output from running the above ** Attachment added: "raw /proc/stat data" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1193073/+attachment/3708233/+files/stat -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1193073 Title: cpu usage does not match sum of per-process usage To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1193073/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
