Gianluca Cecchi <[email protected]> writes: > Hello, > I'm in 4.4.3 and CentOS 8.3 with 3 hosts. > > I have a high performance VM that is running on ov300 and is configured to > be run on any host. > > It seems that both if I set or not the option > > Migrate only to hosts with the same TSC frequency > > I always am unable to migrate the VM and inside engine.log I see this: > > 2020-12-11 15:56:03,424+01 INFO > [org.ovirt.engine.core.bll.scheduling.SchedulingManager] (default task-36) > [e4801b28-c832-4474-aa53-4ebfd7c6e2d0] Candidate host 'ov301' > ('382bfc8f-60d5-4e06-8571-7dae1700574d') was filtered out by > 'VAR__FILTERTYPE__INTERNAL' filter 'Migration-Tsc-Frequency' (correlation > id: null) > > 2020-12-11 15:56:03,424+01 INFO > [org.ovirt.engine.core.bll.scheduling.SchedulingManager] (default task-36) > [e4801b28-c832-4474-aa53-4ebfd7c6e2d0] Candidate host 'ov200' > ('949d0087-2c24-4759-8427-f9eade1dd2cc') was filtered out by > 'VAR__FILTERTYPE__INTERNAL' filter 'Migration-Tsc-Frequency' (correlation > id: null) > > Can you verify if it is only my problem? > > Apart from the problem itself, what is "TSC frequency" and how can I check > if my 3 hosts are different or not indeed?
TSC frequency is the frequency with which Time Stamp Counter register is updated, typically a nominal CPU frequency (see https://en.wikipedia.org/wiki/Time_Stamp_Counter for more details). You can check the value oVirt gets from libvirt by running # virsh -r capabilities and looking at the line like <counter name='tsc' frequency='2133409000' scaling='no'/> in the output. Unless frequency scaling is available, the host frequencies must be almost the same in order to be able to migrate high performance VMs among them. Note there is a bug that may cause a migration failure for the VMs even between hosts with the same frequencies (https://bugzilla.redhat.com/1821199). But this is apparently not your case, since the migration is prevented already by Engine. Regards, Milan > Normal VMs are able to migrate without problems > > Thanks, > Gianluca > _______________________________________________ > Users mailing list -- [email protected] > To unsubscribe send an email to [email protected] > Privacy Statement: https://www.ovirt.org/privacy-policy.html > oVirt Code of Conduct: > https://www.ovirt.org/community/about/community-guidelines/ > List Archives: > https://lists.ovirt.org/archives/list/[email protected]/message/2HYSCVHSVZS6KX5FF5MOXI6YTLQOJIK7/ _______________________________________________ Users mailing list -- [email protected] To unsubscribe send an email to [email protected] Privacy Statement: https://www.ovirt.org/privacy-policy.html oVirt Code of Conduct: https://www.ovirt.org/community/about/community-guidelines/ List Archives: https://lists.ovirt.org/archives/list/[email protected]/message/SXQRJZAYTBFBHZJQVMRUL625NE3NPCZ6/
