dom0 vcpu allocation

[gnpcx]

Hi all,

First and foremost: thank you very much for bringing us Xcpng and Xen Orchestra. It's been a great experience so far

I've just setup new Xcpng 8.2 hosts and I'd like to change dom0 vcpu allocation.

Upon installation dom0 were allocated 16 vcpu out of 64 (HT) when typical dom0 load would not exceed 4.

My questions :

1. Aren't 8 vcpu enough for typical work load ?
2. If so, is it enough to set:

• dom0_vcpus_pin=true
• dom0_max_vcpus=1-8
  in grub.cfg linux boot options ?

Please note that I've tried to use:
/opt/xensource/bin/host-cpu-tune set 8 xpin

but this command fails:

Traceback (most recent call last):
  File "/opt/xensource/bin/host-cpu-tune", line 268, in <module>
    main()
  File "/opt/xensource/bin/host-cpu-tune", line 256, in main
    cpuset(dom0_vcpus, sys.argv[3])
  File "/opt/xensource/bin/host-cpu-tune", line 176, in cpuset
    if int(vm_pcpu) < dom0_vcpus:
ValueError: invalid literal for int() with base 10: ''

Key mask is not found in map VCPUs-params. I could try to fix this manually but I'm not sure about potential side effects.

Thank you

[davemcl]

@gnpcx What did you end up doing for this? The docs dont seem to have any guidance.