Re: [libvirt-users] VMs fail to start with NUMA configuration

On Sun, Jan 27, 2013 at 10:46 PM, Osier Yang&lt;jyang(a)redhat.com&gt; wrote: > On 2013年01月28日 11:47, Osier Yang wrote: >> >> On 2013年01月28日 11:44, Osier Yang wrote: >>> >>> On 2013年01月26日 01:07, Doug Goldstein wrote: >>>> >>>> On Thu, Jan 24, 2013 at 12:58 AM, Osier Yang&lt;jyang(a)redhat.com&gt; wrote: >>>>> >>>>> On 2013年01月24日 14:26, Doug Goldstein wrote: >>>>>> >>>>>> >>>>>> On Wed, Jan 23, 2013 at 11:02 PM, Osier Yang&lt;jyang(a)redhat.com&gt; wrote: >>>>>>> >>>>>>> >>>>>>> On 2013年01月24日 12:11, Doug Goldstein wrote: >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>> On Wed, Jan 23, 2013 at 3:45 PM, Doug Goldstein&lt;cardoe(a)gentoo.org&gt; >>>>>>>> wrote: >>>>>>>>> >>>>>>>>> >>>>>>>>> >>>>>>>>> I am using libvirt 0.10.2.2 and qemu-kvm 1.2.2 (qemu-kvm 1.2.0 + >>>>>>>>> qemu >>>>>>>>> 1.2.2 applied on top plus a number of stability patches). Having >>>>>>>>> issue >>>>>>>>> where my VMs fail to start with the following message: >>>>>>>>> >>>>>>>>> kvm_init_vcpu failed: Cannot allocate memory >>>>>>> >>>>>>> >>>>>>> >>>>>>> >>>>>>> Smell likes we have problem on setting the NUMA policy (perhaps >>>>>>> caused by the incorrect host NUMA topology), given that the system >>>>>>> still has enough memory. Or numad (if it's installed) is doing >>>>>>> something wrong. >>>>>>> >>>>>>> Can you see if there is something about the Nodeset used to set >>>>>>> the policy in debug log? >>>>>>> >>>>>>> E.g. >>>>>>> >>>>>>> % cat libvirtd.debug | grep Nodeset >>>>>> >>>>>> >>>>>> >>>>>> Well I don't see anything but its likely because I didn't do something >>>>>> correct. I had LIBVIRT_DEBUG=1 exported and ran libvirtd --verbose >>>>>> from the command line. >>>>> >>>>> >>>>> >>>>> If the process is in background, it's expected you can't see anything >>>>> >>>>> >>>>> My /etc/libvirt/libvirtd.conf had: >>>>>> >>>>>> >>>>>> log_outputs="3:syslog:libvirtd 1:file:/tmp/libvirtd.log" But I didn't >>>>>> get any debug messages. >>>>> >>>>> >>>>> >>>>> log_level=1 has to be set. >>>>> >>>>> Anyway, let's simply do this: >>>>> >>>>> % service libvirtd stop >>>>> % LIBVIRT_DEBUG=1 /usr/sbin/libvirtd 2>&1 | tee -a libvirtd.debug >>>>> >>>> >>>> That's what I was doing, minus the tee just to the console and nothing >>>> was coming out. Which is why I added the 1:file:/tmp/libvirtd.log, >>>> which also didn't get any debug messages. Turns out this instance must >>>> have been built with --disable-debug, >>>> >>>> All I've got in the log is: >>>> >>>> # grep -i 'numa' libvirtd.debug >>>> 2013-01-25 16:50:15.287+0000: 417: debug : virCommandRunAsync:2200 : >>>> About to run /usr/bin/numad -w 2:2048 >>>> 2013-01-25 16:50:17.295+0000: 417: debug : qemuProcessStart:3614 : >>>> Nodeset returned from numad: 1 >>> >>> >>> This looks right. >>> >>>> >>>> Immediately below that is >>>> >>>> 2013-01-25 16:50:17.295+0000: 417: debug : qemuProcessStart:3622 : >>>> Setting up domain cgroup (if required) >>>> 2013-01-25 16:50:17.295+0000: 417: debug : virCgroupNew:619 : New >>>> group /libvirt/qemu/bb-2.6.35.9-i686 >>>> 2013-01-25 16:50:17.295+0000: 417: debug : virCgroupDetect:273 : >>>> Detected mount/mapping 1:cpuacct at /sys/fs/cgroup/cpuacct in >>>> 2013-01-25 16:50:17.295+0000: 417: debug : virCgroupDetect:273 : >>>> Detected mount/mapping 2:cpuset at /sys/fs/cgroup/cpuset in >>>> 2013-01-25 16:50:17.296+0000: 417: debug : virCgroupMakeGroup:537 : >>>> Make group /libvirt/qemu/bb-2.6.35.9-i686 >>>> 2013-01-25 16:50:17.296+0000: 417: debug : virCgroupMakeGroup:562 : >>>> Make controller /sys/fs/cgroup/cpuacct/libvirt/qemu/bb-2.6.35.9-i686/ >>>> 2013-01-25 16:50:17.296+0000: 417: debug : virCgroupMakeGroup:562 : >>>> Make controller /sys/fs/cgroup/cpuset/libvirt/qemu/bb-2.6.35.9-i686/ >>>> 2013-01-25 16:50:17.296+0000: 417: debug : virCgroupCpuSetInherit:469 >>>> : Setting up inheritance /libvirt/qemu -> >>>> /libvirt/qemu/bb-2.6.35.9-i686 >>>> 2013-01-25 16:50:17.296+0000: 417: debug : virCgroupGetValueStr:361 : >>>> Get value /sys/fs/cgroup/cpuset/libvirt/qemu/cpuset.cpus >>>> 2013-01-25 16:50:17.296+0000: 417: debug : virFileClose:72 : Closed >>>> fd 39 >>>> 2013-01-25 16:50:17.296+0000: 417: debug : virCgroupCpuSetInherit:482 >>>> : Inherit cpuset.cpus = 0-63 >>>> 2013-01-25 16:50:17.296+0000: 417: debug : virCgroupSetValueStr:331 : >>>> Set value >>>> '/sys/fs/cgroup/cpuset/libvirt/qemu/bb-2.6.35.9-i686/cpuset.cpus' >>>> to '0-63' >>> >>> >>> This looks not right, it should be 0-7 instead. >>> >>>> 2013-01-25 16:50:17.296+0000: 417: debug : virFileClose:72 : Closed >>>> fd 39 >>>> 2013-01-25 16:50:17.296+0000: 417: debug : virCgroupGetValueStr:361 : >>>> Get value /sys/fs/cgroup/cpuset/libvirt/qemu/cpuset.mems >>>> 2013-01-25 16:50:17.296+0000: 417: debug : virFileClose:72 : Closed >>>> fd 39 >>>> 2013-01-25 16:50:17.296+0000: 417: debug : virCgroupCpuSetInherit:482 >>>> : Inherit cpuset.mems = 0-7 >>>> 2013-01-25 16:50:17.296+0000: 417: debug : virCgroupSetValueStr:331 : >>>> Set value >>>> '/sys/fs/cgroup/cpuset/libvirt/qemu/bb-2.6.35.9-i686/cpuset.mems' >>>> to '0-7' >>> >>> >>> This is right. >>> >>>> 2013-01-25 16:50:17.296+0000: 417: debug : virFileClose:72 : Closed >>>> fd 39 >>>> 2013-01-25 16:50:17.296+0000: 417: warning : qemuSetupCgroup:388 : >>>> Could not autoset a RSS limit for domain bb-2.6.35.9-i686 >>>> 2013-01-25 16:50:17.296+0000: 417: debug : virCgroupSetValueStr:331 : >>>> Set value >>>> '/sys/fs/cgroup/cpuset/libvirt/qemu/bb-2.6.35.9-i686/cpuset.mems' >>>> to '1' >>> >>> >>> And it's strange that the cpuset.mems is changed to '1' here. > > > Oh, actually this is right, cpuset.mems is about the memory nodes. > > >>> >>>> 2013-01-25 16:50:17.296+0000: 417: debug : virFileClose:72 : Closed >>>> fd 39 >>>> >>>> Could the RSS issue be related? Some kernel related option not playing >>>> nice or enabled? >> >> >> Instead, I'm wondering if the problem is caused by the mismatch >> (from libvirt p.o.v) between cpuset.cpus and cpuset.mems, which >> thus cause the problem for kernel memory management? > > > So, the simple method to prove the guess is to use static placement > like: > > <vcpu placement='static' cpuset='0-63'>2</vcpu> > <numatune> > <memory placement='static' nodeset='1'/> > </numatune> > > Osier Same error. Which I don't know if you expected or didn't expect.