Hi, We have installed and added a new hypervisor into the ovirt cluster but this time with disabled HT.
I migrated a RedHat 5.10 machine to it and immediately the qemu-kvm process running the vm (freshly installed, just basic packages) began to consume 20-40% CPU as showed running top on the hypervisor. Now that I have a hypervisor to run tests in, what would you suggest the next step is? Thank you. Xavier On Thu, Oct 30, 2014 at 12:38 PM, Xavier Naveira <[email protected]> wrote: > Yeah, that's definitively worth a try. The problem is that we have been > running on ovirt for some months now and haven't realized the problem with > the RHEL 5.x vms until recently, when we began to import them (until now we > mainly run RHEL 6.x vms), so the ovirt hypervisors are production machines > and I don't have a lot of margin doing tests on them. Hopefully next week > we'll be able to decomission another of the "old ones" and then we can do > some testing before adding it to the ovirt cluster... The other thing that > we're going to test is disabling HT. > > X > > On Thu, Oct 30, 2014 at 12:33 PM, Gianluca Cecchi < > [email protected]> wrote: > >> On Thu, Oct 30, 2014 at 12:25 PM, Xavier Naveira <[email protected]> >> wrote: >> >>> These hardware is exactly the same, no changes in bios, reinstalled from >>> scratch. >>> >>> The versions in the "old ones" are: >>> >>> RHEL 5.6 >>> kvm-83-224.el5 >>> libvirt-0.8.2-15.el5_6.1 >>> kmod-kvm-83-224.el5 >>> kvm-tools-83-224.el5 >>> libvirt-0.8.2-15.el5_6.1 >>> Kernel: 2.6.18-238.1.1.el5 #1 SMP Tue Jan 4 13:32:19 EST 2011 x86_64 >>> x86_64 x86_64 GNU/Linux >>> >>> I the ovirt "new" ones: >>> >>> RHEL 6.5 >>> qemu-img-rhev-0.12.1.2-2.415.el6_5.14.x86_64 >>> qemu-kvm-rhev-0.12.1.2-2.415.el6_5.14.x86_64 >>> qemu-kvm-rhev-tools-0.12.1.2-2.415.el6_5.14.x86_64 >>> libvirt-0.10.2-29.el6_5.12.x86_64 >>> libvirt-client-0.10.2-29.el6_5.12.x86_64 >>> Kernel: 2.6.32-431.23.3.el6.x86_64 #1 SMP Wed Jul 16 06:12:23 EDT 2014 >>> x86_64 x86_64 x86_64 GNU/Linux >>> >>> I haven't gone into the details but the command line generated by our >>> old software is like 2 lines of text while in the ovirt nodes for the same >>> type of machine it is 10 :) >>> >>> >>> >> >> So one "important" thing is that hypervisor OS was RHEL 5 with plain >> Qemu/KVM and instead RHEL 6 with oVirt.... >> You could check if plain Qemu/KVM with RH EL 6.5 generates the same >> problems for RHEL 5.x VMs.. >> Not that it would solve the problem itself, but it would help to put the >> different OS version of hypervisor as a possible cause >> >> >
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