RE: [Xen-users] Which processorw are VT or Pacifica enabled ?

["Petersson, Mats" <Mats.Petersson@xxxxxxx>]

> -----Original Message-----
> From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx 
> [mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of 
> Sébastien CRAMATTE
> Sent: 14 August 2006 14:06
> To: xen-users@xxxxxxxxxxxxxxxxxxx
> Subject: [Xen-users] Which processorw are VT or Pacifica enabled ?
> 
> Hello
> 
> Which model of processor  are VT or Pacifica enabled  ?

For AMD it's pretty simple: All processors that fit in a "Socket AM2", or put 
another way, has DDR2 interface, will be SVM-capable. Exception would be the 
budget models of Sempron that don't have the SVM feature...

The reason it's so simple to tell is that the AMD processors that have SVM also 
have DDR2, which again means that it needs a different socket - so it's pretty 
easy to tell if it's a new or old processor - the old ones will not fit in the 
new socket, and vice versa. [I'm not a socket specialist - whether we CHOOSE to 
change the socket or HAD to is not something I can comment on, but changing 
socket when changing the type of DRAM supported is probably not really a bad 
idea... It saves a few people from trying to use the processor with the wrong 
type of memory and calling our tech-support to wonder why it doesn't work... 
;-)]

> I've got recent XEON  but it seems that not support VT.

Aside from the processor, Intel processors also need a BIOS that enables the 
feature (or doesn't disable it, at the very least) - I don't know the details 
of this [check my mail address, and you'll probably realize why]. 
> 
> Do it exists a mean under linux to see if  a processor is VT enabled ?
> Maybe a simple  cat /proc/cpuinfo ? 

Yes, it should be under "flags" ("svm" in the AMD case, it's called "vme" in 
the Intel case). You do need a recent kernel for this to work, but I know 
2.6.16.13 is good enough [probably several older ones too]. 

--
Mats

> 
> Regards
> 
> Sebastien
> 
> 
> 
> 
> 
> 
> 
> 
> 
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