NMI behavior on 2.6.18

[bohansen]

Hi,

I recently got hold of new hardware and want to run pve-2.6.18. I have noticed in the "/proc/interrupts" that I get a lot of NMI interrupts (below is just after a reboot):

           CPU0       CPU1       CPU2       CPU3       CPU4       CPU5       CPU6       CPU7       CPU8       CPU9       CPU10      CPU11      
  0:     207361          0          0          0          0          0          0          0          0          0          0          0    IO-APIC-edge  timer
  8:          1          0          0          0          0          0          0          0          0          0          0          0    IO-APIC-edge  rtc
  9:          0          0          0          0          0          0          0          0          0          0          0          0   IO-APIC-level  acpi
 50:          1          0          0          0          0          0          0          0          0          0          0          0   IO-APIC-level  uhci_hcd:usb4, uhci_hcd:usb5, uhci_hcd:usb6, ehci_hcd:usb8
 51:          0          0          0          0          0          0          0          0          0          0          0          0   IO-APIC-level  ata_piix
 67:         96          0          0          0          0          0          0          0        521          0          0        233       PCI-MSI-X  eth0-tx-0
 75:         51          0          0          0          0          0        315         52          0          0         27          0       PCI-MSI-X  eth0-rx-0
 83:         30          0         77          0          0          0          0          0          0          0         20          0       PCI-MSI-X  eth0-rx-1
 91:         46          0          0          0        101          0          0          0         38          0          0          0       PCI-MSI-X  eth0-rx-2
 99:         77          0          0          0          0          0          0          0          0        365        806          0       PCI-MSI-X  eth0-rx-3
107:          3          0          0          0          0          0          0          0          0          0          0          0       PCI-MSI-X  eth0
177:       4136          0       3464          0          0          0          0        158          0          0          0          0   IO-APIC-level  aacraid
226:         72          0          0          0          0          0          0          0          0          0          0          0   IO-APIC-level  uhci_hcd:usb1, uhci_hcd:usb2, uhci_hcd:usb3, ehci_hcd:usb7
234:         87          0          0          0          0          0          0          0          0          0          0          0   IO-APIC-level  ata_piix
NMI:        931         92         85         84         83         83         84         83         83         83         83         84 
LOC:     207141     207130     207045     206969     206894     206818     206743     206666     206591     206514     206440     206357 
ERR:          0
MIS:          0

I have tried kernel 2.6.24 and 2.6.32. They both show 0 NMI. I am able to remove it the NMIs on 2.6.18 by booting the kernel with "nmi_watchdog=0", but that does not seem like the correct solution.
I have two identical boxes - Intel S5520UR mainboard, Westmere XEONs, Adaptec 5445z and at the moment both a Myricom 10GbE and a DXH510 for testing.
Anybody else who sees these NMIs on 2.6.18? Is it something to be concerned about?

Thanks in advance,
Bo