RE: [Xen-users] Problem initializing dual-core Opteron

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

 

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From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx [mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of John Hannfield
Sent: 07 November 2006 13:38
To: Sergey Bondari
Subject: Re: [Xen-users] Problem initializing dual-core Opteron

Thanks Sergey,

I switched the BIOS from APIC to PIC, and added 'nolapic nosmp' to the kernel
line and now it boots OK. However I would like to use smp support to get my dual
core's working.

I will try again a custom kernel dom0 build.
I notice when doing a custom build, xen patches the kernel to
offer a "Subarchitecture Type" set to default 'Xen Compatible'. I can imagine you
would use this setting for domU kernel, but for dom0 should it not be set
to PC Compatible and family set to Opteron? 

 

To build a Xen kernel you MUST set it to Xen Compatible subarch, otherwise it will not build a Xen kernel - Dom0 and DomU must be this sub-architecture.

 

I know for sure that Xen works on multiprocessor setups, as I'm running one dual core FX-62 and another that is using 2x Opteron 2218. Since the code in Xen at the point of starting processors is completely ignorant about the AMD-V features, it shouldn't make any difference that you have older Socket 940 type of processor, it still should boot nicely with the standard Xen source code. But of course, it doesn't work, so something is probably wrong - not sure what or why, tho'.

 

--

Mats

 

 

Eg:

Subarchitecture Type (PC-compatible)
Processor family (Opteron/Athlon64/Hammer/K8)  ---> 

 

Thanks
John

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