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

[Artur Schiefer <aschiefer@xxxxxx>]

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.

ciao,
artur

Am Freitag, den 10.03.2006, 02:22 +0100 schrieb Erik Tews:
> Am Donnerstag, den 09.03.2006, 22:50 +0100 schrieb aschiefer@xxxxxx:
> > hello,
> > maybe i was writing a bit to amd marketing like, excuse me for that. they  
> > want to integrate pacifica into all their "newly released" processor,  
> > which means the processors are not yet available. the link is  
> > http://www.amd.com/us-en/Corporate/VirtualPressRoom/0,,51_104_543~104860,00.html,
> >   
> > but the thing you are probably most interested in is(quote):
> > AMD?s I/O virtualization technology is expected to be supported by all
> > AMD processors in mid-2006, and is also anticipated to be implemented in
> > chipsets and core logic designed for AMD64-based platforms in 2006. The
> > AMD I/O virtualization technology specification download, together with
> > technology overviews and guidance to software developers who are
> > designing virtualization solutions for 64-bit technology, can be found
> > at http://developer.amd.com.
> 
> Thanks again.
> 
> But I think there are currently no real devices available you can buy
> with pacifica-support.
> 
> So I think I will have to compare opterons without pacifica support to
> intel cpus with vanderpool-support, because I can currently buy such
> cpus.
> 
> So how can those cpus be compared, if I need a system with 4 gb of ram?
> Giving more than 2 GB to a single userspace process on an 32 bit system
> can be quite difficult. Does an opteron cpu run fine with xen 3.0 in 64
> bit mode, with some 32 bit guests, without any hardware accelleration?
> 


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