does anyone have Xen running on an AMD system?

[Gót András]

Good point. I'll make tests with 768MB and 512MB on AMD and Xeon systems 
also.

Sergey G Nasonov wrote:
> I am sorry for intrusion. I have the same problem (pmap_init) running FreeBSD 8.2 r217259 i386 PV mode on Citrix XenServer 5.6. The server is IBM x3650 with intel Xeon 5405 
> 
> cpu_count                : 4
>                    vendor: GenuineIntel
>                     speed: 1995.001
>                 modelname: Intel(R) Xeon(R) CPU           E5405  @ 2.00GHz
>                    family: 6
>                     model: 23
>                  stepping: 6
>                     flags: fpu de tsc msr pae mce cx8 apic sep mtrr mca cmov pat clflush acpi mmx fxsr sse sse2 ss ht constant_tsc pni vmx ssse3 sse4_1
>                  features: 000ce33d-bfebfbff-00000001-20000800
>     features_after_reboot: 000ce33d-bfebfbff-00000001-20000800
>         physical_features: 000ce33d-bfebfbff-00000001-20000800
>                  maskable: base
> 
> WARNING: loader(8) metadata is missing!
> GDB: no debug ports present
> KDB: debugger backends: ddb
> KDB: current backend: ddb
> Copyright (c) 1992-2011 The FreeBSD Project.
> Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994
> The Regents of the University of California. All rights reserved.
> FreeBSD is a registered trademark of The FreeBSD Foundation.
> FreeBSD 8.2-PRERELEASE #4: Wed Jan 12 13:30:44 MSK 2011
>     root at fbsd8x32.bcc.:/usr/obj/usr/src/sys/XEN i386
> WARNING: WITNESS option enabled, expect reduced performance.
> panic: pmap_init: page table page is out of range
> cpuid = 0
> KDB: enter: panic
> [thread pid 0 tid 0 ]
> Stopped at      0xc010ab0a:     movl    $0,0xc03e6f74
> db> 
> db> 
> db> 
> 
> 
> FreeBSD VM has 1GB memory. And this problem does not appear when I reduce amount of RAM to 512 MB. 
> Unfortunately, currently I dont have any servers with AMD Opteron CPU to test.
>