8:13 a.m.
Hi,
What are the pro and cons of enabling pass-through CPU ?
It is a greyed option for a VM, unless specific host(s) is/are selected.
That's the thing : it's possible to select all hosts..., so, it does not make
difference w/ "Start on any host" option
12:08 p.m.
If you have hosts with the exact same cpu, you can enable cpu passthrough and set the
hosts from the "Specific Host(s)" section. Also you can set the migration mode
to "Allow manual and automatic migration".
I guess you already noticed that VMs with CPU passthrough have access to more CPU
instructions compared to the Virtualized one.
Best Regards,Strahil Nikolov
Hi,
What are the pro and cons of enabling pass-through CPU ?
It is a greyed option for a VM, unless specific host(s) is/are selected.
That's the thing : it's possible to select all hosts..., so, it does not make
difference w/ "Start on any host" option
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8:18 a.m.
Hi,
Thanks for you reply.
As far as we are concerned, we have two clusters with perfectly identical CPUs,
respectively. Not the same family.
I understand that a cluster will only allow CPUs of the same "family" but I
never investigate that.
Is there a CPU family <--> CPU name relationship somewhere ?
That said, are those extra instructions only relevant to nested virtualization, or can
they provide real performances improvement ?
*Laurent Duparchy
ESRF - The European Synchrotron
MIS Unit
04 76 88 22 56*
Strahil Nikolov wrote on 18/01/2023 18:08:
If you have hosts with the exact same cpu, you can enable cpu
passthrough and set the hosts from the "Specific Host(s)" section. Also you can
set the migration mode to "Allow manual and automatic migration".
I guess you already noticed that VMs with CPU passthrough have access to more CPU
instructions compared to the Virtualized one.
Best Regards,
Strahil Nikolov
Hi,
What are the pro and cons of enabling pass-through CPU ?
It is a greyed option for a VM, unless specific host(s) is/are selected.
That's the thing : it's possible to select all hosts..., so, it does not make
difference w/ "Start on any host" option
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12:22 p.m.
You can check which families are supported by an oVirt Host via:virsh domcapabilities |
xmllint --xpath '/domainCapabilities/cpu' -
For the instruction set - it all depends on the app. Set your VM with the cluster's
top notch CPU , run your app and note down the performance indicators. Once the test is
over, shitdown the VM, set the CPU to host-passthrough and test again.
Best Regards,Strahil Nikolov
On Mon, Jan 23, 2023 at 15:19, Laurent Duparchy<duparchy(a)esrf.fr> wrote:
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duparchy＠esrf.fr -
Laurent Duparchy
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Strahil Nikolov