Re: [Xen-users] Migrating domU and virtualization extensions

[Christopher DeMarco <demarco@xxxxxxxx>]

On Mon, Jun 11, 2007 at 11:53:59PM +0100, Mark Williamson wrote:

> Yes, I guess you should be able to - are they both the same manufacturer?  
> Both Intel?  What models are they, actually?

Well, I don't get it.

They're both Intel Xeons, but on the old box, the contents of
/proc/cpuinfo differ from the output of ``cpuid'' -- cpuinfo doesn't
list vme/vmx, but cpuid does.  Also, /proc/cpuinfo on the new system
lists *8* cores, but I coulda sworn that Dell's deal was for 2
dual-core Xeons.  Gotta lookit that onsite tomorrow.

But anyway, here's a diff against ``cpuid'' on both boxen.  "onion" is
the old one, "wilbur" is the new one:

--- onion       2007-06-11 23:48:55.000000000 -0400
+++ wilbur      2007-06-11 23:49:42.000000000 -0400
@@ -1,35 +1,35 @@
  eax in    eax      ebx      ecx      edx
-00000000 00000005 756e6547 6c65746e 49656e69
-00000001 00000f41 01020800 0000641d bfebfbff
-00000002 605b5001 00000000 00000000 007c7040
+00000000 00000006 756e6547 6c65746e 49656e69
+00000001 00000f64 03040800 0000e4bd bfebfbff
+00000002 605b5001 00000000 00000000 007d7040
 00000003 00000000 00000000 00000000 00000000
-00000004 00004121 01c0003f 0000001f 00000000
+00000004 04004121 01c0003f 0000001f 00000000
 00000005 00000040 00000040 00000000 00000000
+00000006 00000000 00000000 00000000 00000000
 80000000 80000008 00000000 00000000 00000000
-80000001 00000000 00000000 00000000 20100000
+80000001 00000000 00000000 00000001 20100000
 80000002 20202020 20202020 20202020 20202020
 80000003 6e492020 286c6574 58202952 286e6f65
-80000004 20294d54 20555043 30382e32 007a4847
+80000004 20294d54 20555043 30302e33 007a4847
 80000005 00000000 00000000 00000000 00000000
-80000006 00000000 00000000 04006040 00000000
+80000006 00000000 00000000 08006040 00000000
 80000007 00000000 00000000 00000000 00000000
 80000008 00003024 00000000 00000000 00000000
 
-Vendor ID: "GenuineIntel"; CPUID level 5
+Vendor ID: "GenuineIntel"; CPUID level 6
 
 Intel-specific functions:
-Version 00000f41:
+Version 00000f64:
 Type 0 - Original OEM
 Family 15 - Pentium 4
 Extended family 0
-Model 4 - 
-Stepping 1
+Model 6 - 
+Stepping 4
 Reserved 0
 
-Extended brand string: "                  Intel(R) Xeon(TM) CPU
2.80GHz"
+Extended brand string: "                  Intel(R) Xeon(TM) CPU
3.00GHz"
 CLFLUSH instruction cache line size: 8
-Initial APIC ID: 1
-Hyper threading siblings: 2
+Hyper threading siblings: 4
 
 Feature flags bfebfbff:
 FPU    Floating Point Unit
@@ -67,5 +67,5 @@
 60: unknown TLB/cache descriptor
 40: No 2nd-level cache, or if 2nd-level cache exists, no 3rd-level
cache
 70: Trace cache: 12K-micro-op, 4-way set assoc
-7c: 2nd-level cache: 1MB, 8-way set assoc, sectored, 64 byte line
size
-Processor serial: 0000-0F41-0000-0000-0000-0000
+7d: unknown TLB/cache descriptor
+Processor serial: 0000-0F64-0000-0000-0000-0000


> etc).  They get horribly confused if live migration happens - if they 
> suddenly find themselves migrated to a system without the capabilities they 
> were expecting, receive invalid operation exceptions, and probably crash.

Does this mean that an offline migration will work?  If I can just
shut down the domU and then ``tar | nc | tar'', I'm thrilled.  VMWare
won't run a VM from the old system on the new one.


-- 
Christopher DeMarco <demarco@xxxxxxxx>
Information Technology Supervisor
MAYA Group
+1-412-488-2900

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