Re: [libvirt] [PATCH 0/7] x86: Rework KVM-defaults compat code, enable kvm_pv_unhalt by default
On 10/10/2017 11:50 AM, Eduardo Habkost wrote:
> Yes. Another possibility is to enable it when there is >1
NUMA node in
> the guest. We generally don't do this kind of magic but higher layers
> (oVirt/OpenStack) do.
Can't the guest make this decision, instead of the host?
By guest, do you mean the guest OS itself or the admin of the guest VM?
I am thinking about maybe adding kernel boot command line option like
"unfair_pvspinlock_cpu_threshold=4" which will instruct the OS to use
unfair spinlock if the number of CPUs is 4 or less, for example. The
default value of 0 will have the same behavior as it is today. Please
let me know what you guys think about that.
Cheers,
Longman
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