Re: [Xen-users] xen on amd64 or intel

[Ernst Bachmann <e.bachmann@xxxxxxxx>]

On Friday 10 March 2006 11:15, Artur Schiefer wrote:
> hello,
>
> as i mentioned earlier (sorry i don't remember the source anymore), i
> read a test which said as long as you have only as many vm's as actual
> processor cores the opteron is better, otherwise intel was better due to
> its hyperthreading. the performance loss is already low now for both
> plattforms (we measured less than ca. 5%), i only experience signifcant
> performance problems with the gbit network of the domUs.
>
I remember reading a mail here saying you're better off disabling HT on Intel 
when running Xen, as it causes a major slowdown if the two threads are 
assigned to different domUs.

There was no explanation given, so I'm not sure if thats true. (Maybe problems 
with pagetable cache?)

/Ernst

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