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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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