[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH RFC v6 10/11] pvqspinlock, x86: Enable qspinlock PV support for KVM
Il 17/03/2014 18:47, Waiman Long ha scritto: Yeah, what I mean is that the patches that enable paravirtualization should also take care of decreasing the unfair-lock jump label when paravirtualization is enabled.As there are people who don't like unfair lock at all, I prefer to give them the option to turn this on or off instead of forcing them to always use unfair lock in a PV guest. I understand, but this is virtualization after all. A bad scheduler decision means no progress at all. That's much worse than unfairness. And also, KVM and Xen will stay fair, so if you want fairness just pick a hypervisor that supports it. Paolo _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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