TLB shootdowns in /proc/interrupts (different results)

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Hi,
I have two x86_64 machines:
On the first there is Fedora 18 (x86_64); on the second there is
Ubunutu 12.10 (server, 64 bit).

I run cat /proc/interrupts on both machines; in both cases, I run this command
after an hour when the machine is up.
I get:
On the fedora machine
cat /proc/interrupts | grep TLB
TLB:          0          0   TLB shootdowns
On the Ubuntu machine, however, there are many TLB shootdowns, on both
cores.


Can anyone explains why is it so ?

rgs,
Kevin

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