Problem
i have 20 vcpu’s on 12700k
qubes detects only 12
Anyway to solve this?
Hey,
according to this site, your CPU has 12 physical cores, and 8 additional threads.
As SMT is disabled on qubes per default for security reasons, this is expected behavior.
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didn;t know that…
My threat model is not that high, is there a way to enable SMT??
Yes.
If you really understand the risks that come with hyper threading and choose to accept them you can edit the command line of your xen hypervisor. I have not tried that, but it seems pretty straight forward.
On (my) 4.1 i would go into /boot/efi/EFI/qubes/grub.cfg, find all occurrences of “smt=off” and replace them with “smt=on”. 4.0 should work kind of the same, just look for some files in this directory with text and edit those.
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do i need to add this command also to the smt = on??
sched-gran=core??
what does this command do??
in reference to this comment [qubes-users] Please submit R4.1 HCL reports! - #4 by awokd1
smt = on does enable smt.
sched-gran=core does set the scheduling granularity to one physical core as documented here. May not be nedded, i don’t know.
Be sure to read this first though:
and this