[2.5.73] What causes this high interrupt count?

From: Jurgen Kramer (gtm.kramer@inter.nl.net)
Date: Sun Jun 29 2003 - 15:16:20 EST


Hi,

With 2.5.73 with ACPI enabled on my P4 HT system irq 18 seems to be
very busy:
           CPU0 CPU1
  0: 633529 76869 IO-APIC-edge timer
  2: 0 0 XT-PIC cascade
  9: 0 0 IO-APIC-level acpi
 14: 12139 0 IO-APIC-edge ide0
 15: 2 0 IO-APIC-edge ide1
 16: 58707 0 IO-APIC-level uhci-hcd, uhci-hcd, nvidia
 17: 56840 0 IO-APIC-level Intel ICH5
 18: 88494437 48181320 IO-APIC-level ide2, uhci-hcd
 19: 15975 0 IO-APIC-level uhci-hcd
 20: 183 0 IO-APIC-level ohci1394
 21: 1647 0 IO-APIC-level eth0
 23: 68 0 IO-APIC-level ehci_hcd
NMI: 0 0
LOC: 710285 710628
ERR: 0
MIS: 0

ide2 is the onboard Intel SATA (ICH5) controller. I am not sure what is
causing these interrupts.

Top shows a lot of CPU load being generated caused by the high interrupt
count:

81 processes: 80 sleeping, 1 running, 0 zombie, 0 stopped
CPU0 states: 2.0% user 58.0% system 0.0% nice 0.0% iowait 40.0%
idle
CPU1 states: 3.0% user 0.0% system 0.0% nice 0.0% iowait 97.0%
idle
Mem: 515480k av, 198452k used, 317028k free, 0k shrd, 14760k
buff
       122252k active, 50596k inactive
Swap: 787176k av, 0k used, 787176k free 94040k
cached

I've had the same problem with 2.4.21 plus a recent ACPI. What can be
the culprit?

Cheers,

Jurgen

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