Re: [Xen-users] VCPU: Xen vs VMWare ESX

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Thu, 2014-02-27 at 15:29 -0500, James Pifer wrote:
> A VMWare guy is telling me you have to be very careful with VMWare to 
> properly size maximum VM to host ratio or you'll end up with VMs waiting 
> for CPU. If you assign 4 CPUS to a VM, all four CPUs must be available 
> or the VM will wait. Maybe that's the same in Xen and there's enough 
> idle time to handle it (on my server)?

Sounds like he is suggesting that VMware does "gang scheduling"?

Xen doesn't do that, a vcpu can be scheduled while other vcpus from the
same domain are blocked.

Ian.



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