Tim: >> I don't have the original poster's problem, but I tried that command to >> see what happens. The same results, each time: >> >> [root@bigblack ~]# cat /proc/interrupts | grep timer >> 0: 180 IO-APIC-edge timer Mike: > Weird. I wonder if there is another interrupt used to 'bump' the clock? > Just for grins try it w/o the grep. There should be a list of a dozen or > so interrupts. See if the line associated with rtc is 'racing'. Or > maybe there's yet another interrupt used (other than ethX, ideX etc.). [root@bigblack ~]# cat /proc/interrupts CPU0 0: 179 IO-APIC-edge timer 1: 2 IO-APIC-edge i8042 6: 5 IO-APIC-edge floppy 7: 0 IO-APIC-edge parport0 8: 0 IO-APIC-edge rtc0 10: 0 IO-APIC-edge MPU401 UART 12: 4 IO-APIC-edge i8042 14: 13217 IO-APIC-edge libata 15: 1842 IO-APIC-edge libata 16: 3454 IO-APIC-fasteoi ohci_hcd:usb1, ohci_hcd:usb2 17: 502 IO-APIC-fasteoi SiS SI7012, eth0 18: 17782 IO-APIC-fasteoi nvidia 20: 0 IO-APIC-fasteoi acpi NMI: 0 LOC: 93114 ERR: 0 MIS: 0 I've rebooted since the last test, which probably accounts for the 179 where I previously had 180. But I get unchanging results, again. Each iteration of the command produces the same results. -- [tim@bigblack ~]$ uname -ipr 2.6.22.1-41.fc7 i686 i386 Using FC 4, 5, 6 & 7, plus CentOS 5. Today, it's FC7. Don't send private replies to my address, the mailbox is ignored. I read messages from the public lists.