Hi Marcus,
My AMD setup had the problem under 3.3.0 and adding this to the VM
config file fixed it:
cpuid =
['0x80000005:ecx=xxxxxxxxxxxxxxxxxxxxxxxxkkkkkkkk,edx=xxxxxxxxxxxxxxxxxx
xxxxxxkkkkkkkk']
I dont know if this will work for Intel and do not understand the full
CPUID signature but its worth a try.
Rob
------------------------------------------------------------------------
*From:* xen-users-bounces@xxxxxxxxxxxxxxxxxxx on behalf of Marcus Hall
*Sent:* Mon 02/02/2009 16:27
*To:* xen-users@xxxxxxxxxxxxxxxxxxxx
*Subject:* Re: [Xen-users] Xen 3.3.0 cpu cache problems
Sounds interesting. I am using Gentoo and unfortunately Xen 3.3.1 is not
in portage yet.
What is this CPUID fix you are talking about and where can I find it? I
have spent some hours searching on this issue and I have not found any
solution yet.
Best regards,
Marcus Hall
Robert Dunkley wrote:
> This is a known problem ,there is a CPUID fix floating around that you
> apply to the VM config file. Alternatively upgrading to Xen 3.3.1
> should fix the problem.
>
> Rob
>
> ------------------------------------------------------------------------
> *From:* xen-users-bounces@xxxxxxxxxxxxxxxxxxx on behalf of Marcus Hall
> *Sent:* Mon 02/02/2009 15:47
> *To:* xen-users@xxxxxxxxxxxxxxxxxxxx
> *Subject:* [Xen-users] Xen 3.3.0 cpu cache problems
>
> Dear Xen users,
>
> I have a problem with "Xen 3.3.0". All domU (paravirt) only have "32 KB"
> of cache instead of "6144 KB" as listed in dom0. This is really
> noticeable under load since the system tends to be really slow.
>
> I did not have this problem with "Xen 3.2.1".
>
> I'm using the same domU configuration files for the new and the old
> installation.
>
> Look at the field, cache size.
>
> *"cat /proc/cpuinfo" under dom0.*
>
> processor : 0
> vendor_id : GenuineIntel
> cpu family : 6
> model : 23
> model name : Intel(R) Xeon(R) CPU E5420 @ 2.50GHz
> stepping : 10
> cpu MHz : 2493.748
> cache size : 6144 KB
> physical id : 0
> siblings : 1
> core id : 0
> cpu cores : 1
> fpu : yes
> fpu_exception : yes
> cpuid level : 13
> wp : yes
> flags : fpu de tsc msr pae cx8 apic sep mtrr cmov pat clflush
> acpi mmx fxsr sse sse2 ss ht syscall nx lm constant_tsc pni est ssse3
> cx16 lahf_lm
> bogomips : 4989.52
> clflush size : 64
> cache_alignment : 64
> address sizes : 38 bits physical, 48 bits virtual
> power management:
> *
> "cat /proc/cpuinfo" under domU.*
>
> processor : 0
> vendor_id : GenuineIntel
> cpu family : 6
> model : 23
> model name : Intel(R) Xeon(R) CPU E5420 @ 2.50GHz
> stepping : 10
> cpu MHz : 2493.748
> cache size : 32 KB
> physical id : 0
> siblings : 1
> core id : 0
> cpu cores : 1
> fpu : yes
> fpu_exception : yes
> cpuid level : 13
> wp : yes
> flags : fpu de tsc msr pae cx8 apic sep cmov pat clflush acpi mmx
> fxsr sse sse2 ss ht syscall nx lm constant_tsc pni ssse3 cx16 lahf_lm
> bogomips : 4992.45
> clflush size : 64
> cache_alignment : 64
> address sizes : 38 bits physical, 48 bits virtual
> power management:
>
> *domU config file:*
>
> kernel = "/etc/xen/kernel/vmlinuz-2.6.21-xen-domU"
> builder='linux'
> memory = 3072
> name = "host1"
> cpus = "0-2"
> vcpus = 3
> vif = [ 'mac=xx:xx:xx:xx:xx:xx, vifname=host1, bridge=bridge22' ]
> disk = [ 'phy:/dev/mapper/xen_virtual_volume-host1_root,sda1,w',
> 'phy:/dev/mapper/xen_virtual_volume-host1_var,sda2,w',
> 'phy:/dev/mapper/xen_virtual_volume-host1_swap,sda3,w',
> 'phy:/dev/mapper/xen_virtual_volume-host1_srv,sda4,w' ]
> root = "/dev/sda1 ro"
> extra = "4"
>
> *Versions:*
>
> app-emulation/xen-3.3.0
> app-emulation/xen-tools-3.3.0
> sys-kernel/xen-sources-2.6.21
>
> Best regards,
> Marcus
>
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