On 12/14/2012 11:04 PM, Eric Blake wrote: > On 12/14/2012 12:37 AM, Dennis Chen wrote: >> Hi, >> >> Seems this question is not related with libvirt directly, but I still want to ping this list to see if someone can be help. >> >> The OS in my desktop box is Ubuntu 12.10, the kernel is 3.5.1. I installed the cgroup utility package with:#apt-get install cgroup-bin, but after I installed these packages successfully, I can't find cpu_quota/cpu_period controller in the /sys/fs/cgroup/cpu folder. So the essential question is: >> >> What I need to do to make cgroup can support CFS BWC feature? > Your kernel sounds new enough, and since you have cgroups turned on, > libvirt should just be able to use it. Did you restart libvirtd after > turning on cgroups? I tried restart the libvirtd but seems this approach is not effective... >> Specifically, how to make the cpu_quota/cpu_period to be available within cgroup/cpu? > Have you tried using the libvirt XML markings that control cpu quota > and period? If so, it either works (you have everything you need), or > else it would be helpful if you posted the error message you get when trying. > For reference, the XML to use is documented at: > http://libvirt.org/formatdomain.html#elementsCPUTuning > and you can also do hot-plug modifications by using virsh schedinfo. > Yes, I tried. Below is the error info when I tried to start the vm with the modified xml file: virsh # create /etc/libvirt/qemu/odm.xml error: Failed to create domain from /etc/libvirt/qemu/odm.xml error: Unable to get cpu bandwidth period: No such file or directory As the hot-plug method, the virsh will complain: virsh # schedinfo odm --set cpu_period=1000000 Scheduler : posix error: invalid scheduler option: cpu_period=1000000 So I think the root cause is no cpu_period/quota in my installed cgroup folder. Interesting, I remembered a couple of weeks ago, I had an older Linux distribution installed, the cpu_period/quota is there. BRs, Dennis _______________________________________________ libvirt-users mailing list libvirt-users@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/libvirt-users
