[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] RE: TSC scaling and softtsc reprise, and PROPOSAL
> > Savvy system admins (who know every app in their > > data center and/or are willing to take the risk > > for better performance) should be able to easily > > disable softtsc though on all servers with a xen boot > > option, or on a per VM basis. > > > > We could quibble about details (maybe softtsc > > should only be automatically enabled on SMP guests > > or on 64-bit SMP guests or ?? ) but I suspect > > that just creates a mess and IMHO we should just > > bite the bullet. > > I can live with that, if it is driven from the xend > toolstack. It will have > to default off in the hypervisor for compatibility with old > saved images. > > -- Keir Hmmm... one could argue that with the current model, any VM using TSC is "at your own peril" and there are certainly cases of restore that will break whatever assumptions the VM is making about pre-save TSC values. So while I'm a believer in compatibility, I'd suggest default ON in the hypervisor and a new restore option that force-overrides the softtsc boot-time default for any VM being restored. _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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