There is the result of cat /proc/interrupts|grep timer on my Ubuntu 11.04 machine:

  0:         63          0          0          0   IO-APIC-edge      timer
LOC:         59         44         27         10   Local timer interrupts

As one can see timer interrupts count is suspiciously small and is updated very slowly — it takes more than 30 seconds (or even more) for the value to be incremented. Though this do not cause any work or performance issues, this oddity is very disturbing so I will very appreciate any help.

Here is a uname output, I have Core i5 760 with 4 cores:

Linux calculon 2.6.38-11-generic #48-Ubuntu SMP Fri Jul 29 19:02:55 UTC 2011 x86_64 x86_64 x86_64 GNU/Linux

The Linux kernel no longer requires a periodic interrupt, having gone tickless in 2006 or so. In addition, the kernel has many different sources of interrupts it can use (PIT, APIC, HPET), so not seeing interrupts in one particular place doesn't mean anything.

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