Re: [Xen-users] GPLPV xennet bsod when vcpu>15

[James Harper <james.harper@xxxxxxxxxxxxxxxx>]

> Hello,
> 
> I installed the signed drivers from
> http://wiki.univention.de/index.php?title=Installing-signed-GPLPV-drivers
> and I ran into a BSOD on a Windows 2008 Server R2 Enterprise domU with a
> large number of vcpu's. The BSOD is related to xennet.sys.
> 
> After some trials I found that it runs fine up to 15 cores. From 16 or more, 
> the
> BSOD kicks in when booting the domU.
> 
> The hardware (4 times  X7550) runs Xen version 4.1.2_05-1.1.1 (abuild@) (gcc
> version 4.6.2 (SUSE Linux) (openSUSE 12.1) ).
> Dom0: 3.1.9-1.4-xen x86_64
> DomU: Windows 2008 Server R2 Enterprise 64b.
> 
> This happened with versions 0.11.0.308 and 0.11.0.356.
> 
> Is this a known problem?
> 

Not until you just mentioned it. I've never tried it, but looking at the code 
I'd expect that the limit would have been 32 or 64, not 16. I can't think why 
xennet would be caring about the number of processors either, although that 
could just be a symptom of a problem in xenpci.

I'll try and find some time to test it myself.

James

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