[ovirt-users] Re: High performance VM cannot migrate due to TSC frequency

2020-12-18 Thread Milan Zamazal
Gianluca Cecchi writes: > On Thu, Dec 17, 2020 at 5:30 PM Milan Zamazal wrote: > >> Gianluca Cecchi writes: >> >> > On Wed, Dec 16, 2020 at 8:59 PM Milan Zamazal >> wrote: >> > >> >> >> >> If the checkbox is unchecked, the migration shouldn't be prevented. >> >> I think the TSC frequency shoul

[ovirt-users] Re: High performance VM cannot migrate due to TSC frequency

2020-12-17 Thread Gianluca Cecchi
On Thu, Dec 17, 2020 at 5:30 PM Milan Zamazal wrote: > Gianluca Cecchi writes: > > > On Wed, Dec 16, 2020 at 8:59 PM Milan Zamazal > wrote: > > > >> > >> If the checkbox is unchecked, the migration shouldn't be prevented. > >> I think the TSC frequency shouldn't be written to the VM domain XML

[ovirt-users] Re: High performance VM cannot migrate due to TSC frequency

2020-12-17 Thread Milan Zamazal
Gianluca Cecchi writes: > On Wed, Dec 16, 2020 at 8:59 PM Milan Zamazal wrote: > >> >> If the checkbox is unchecked, the migration shouldn't be prevented. >> I think the TSC frequency shouldn't be written to the VM domain XML in >> such a case and then there should be no restrictions (and no gua

[ovirt-users] Re: High performance VM cannot migrate due to TSC frequency

2020-12-16 Thread Gianluca Cecchi
On Wed, Dec 16, 2020 at 8:59 PM Milan Zamazal wrote: > > If the checkbox is unchecked, the migration shouldn't be prevented. > I think the TSC frequency shouldn't be written to the VM domain XML in > such a case and then there should be no restrictions (and no guarantees) > on the frequency. > >

[ovirt-users] Re: High performance VM cannot migrate due to TSC frequency

2020-12-16 Thread Milan Zamazal
Gianluca Cecchi writes: > On Fri, Dec 11, 2020 at 5:39 PM Milan Zamazal wrote: > >> >> >> 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 c

[ovirt-users] Re: High performance VM cannot migrate due to TSC frequency

2020-12-14 Thread thomas
I'd put my money on a fall-through error condition where TSC is simply the last one with a 'good' error message pointed to. I have clusters with CPUs that are both 10 years and 10x apart in performance performing migrations between themselves quite happily (Sandy Bridge dual quads to Skylake 56

[ovirt-users] Re: High performance VM cannot migrate due to TSC frequency

2020-12-11 Thread Gianluca Cecchi
On Fri, Dec 11, 2020 at 5:39 PM Milan Zamazal wrote: > > > 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 l

[ovirt-users] Re: High performance VM cannot migrate due to TSC frequency

2020-12-11 Thread Milan Zamazal
Gianluca Cecchi 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