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[Xen-users] Re: Xen-users Digest, Vol 47, Issue 188
- To: xen-users@xxxxxxxxxxxxxxxxxxx
- From: PattiMichelle <miche1@xxxxxxxxxxxxx>
- Date: Fri, 30 Jan 2009 08:04:56 -0800
- Delivery-date: Fri, 30 Jan 2009 08:05:25 -0800
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- List-id: Xen user discussion <xen-users.lists.xensource.com>
Yes, thank you James, that's about right, but domU seems to see all
cores, it's just the guest OS that sees only one core-per-socket. To
overcome that, I'd like to convert all sockets (in the guest) to dual
or quad cores (AMD). I found the guest's config file, not sure where
the domU config file is.
I bought, but didn't find any references to this subject in the book
"Running Xen." I was confused by the position within the string of
"xxxx"-s of the apparently binary information in those structure
variables - is position important? Now it's even more complicated
since AMDs are treated differently than Intel! Thank you for the
cut-n-paste - I guess I can try fooling around with it and see if I get
lucky, else one of the Xen authors can help?
Now that I think about it, can I run WinXP and expose two 16-core
processors? (XP is supposed to support two sockets). That would be bonus.
Patti
If I understand what you want correctly, you can do this by specifying
the cpuid option in your domU config. The following is cut&paste from
xmexample.hvm
# Expose to the guest multi-core cpu instead of multiple processors
# Example for intel, expose a 8-core processor :
#cpuid=['1:edx=xxx1xxxxxxxxxxxxxxxxxxxxxxxxxxxx,
# ebx=xxxxxxxx00010000xxxxxxxxxxxxxxxx',
# '4,0:eax=001111xxxxxxxxxxxxxxxxxxxxxxxxxx']
# - CPUID.1[EDX][HT] : Enable HT
# - CPUID.1[EBX] : Number of vcpus * 2
# - CPUID.4,0[EAX] : Number of vcpus * 2 - 1
#vcpus=8
#
# Example for amd, expose a 5-core processor :
# cpuid = ['1:ebx=xxxxxxxx00001010xxxxxxxxxxxxxxxx,
# edx=xxx1xxxxxxxxxxxxxxxxxxxxxxxxxxxx',
# '0x80000001:ecx=xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx1x',
# '0x80000008:ecx=xxxxxxxxxxxxxxxxxxxxxxxxxx001001']
# - CPUID.1[EBX] : Threads per Core * Cores per Socket (2 * #vcpus)
# - CPUID.1[EDX][HT] : Enable HT
# - CPUID.0x80000001[CmpLegacy] : Use legacy method
# - CPUID.0x80000008[ECX] : #vcpus * 2 - 1
#vcpus=5
I'm not sure what version of xen you get with OpenSuse 11, and I'm not
exactly sure when the cpuid option first appeared.
James
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