Yep, that fixed it. stress -c 8 is now using all 8 CPUs. Please cherry- pick upstream commit 728e5653e6fdb into Utopic. :-)
Just for posterity, I'm attaching some instructive dmesg output. This is obtained by booting with the sched_debug parameter, switching the printk level to DEBUG, and offlining/onlining a CPU. (I think this info can be obtained other ways, but this was easiest.) Notice that in the broken output, there is no sched-domain that contains more than 2 of 8 CPUs. ** Attachment added: "dmesg-broken-3.16.0-25.33.txt" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1386473/+attachment/4274374/+files/dmesg-broken-3.16.0-25.33.txt -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1386473 Title: Not using all cores after upgrade to 14.10 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1386473/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
