Re: [Xen-users] what makes a good xen machine?

["M.A. Williamson" <maw48@xxxxxxxxx>]

Well...

It all depends on what you're doing. There are a few rules of thumb, 
though:
* Hyperthreading helps (though not essential) - if dom0 can have a 
dedicated hyperthread, it can run all the time servicing other domains with 
having to be context-switched in and out. * You need enough memory to give 
*each* virtual machine (including dom0), plus some extra for Xen itself. 
Because the memory is hard-partitioned (you can't overcommit) you need to 
have enough for all the domains. * Processor speed needs to be enough to 
cope with the computation you're doing across all the virtual machines (+ a 
bit extra for overheads).
For very demanding network loads (small packets at GigE line rate), you 
need lots of CPU (i.e. true SMP) but since this is a pessimal case, its 
unlikely you have a workload that requires it.
Cheers,
Mark

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