[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.


Xen-devel mailing list



Lists.xenproject.org is hosted with RackSpace, monitoring our
servers 24x7x365 and backed by RackSpace's Fanatical Support®.