I told John Hodges:
> Try adding " noapic" to the end of the kernel line in
> /boot/grub/grub.conf
<snip>
> What does /proc/interrupts show? (It would be interesting to see a
> "before and after" for the noapic change.
He replied:
> Before:
> CPU0 CPU1
> 0: 226311 190074 IO-APIC-edge timer
> 1: 149 438 IO-APIC-edge i8042
> 2: 0 0 XT-PIC cascade
> 8: 1 0 IO-APIC-edge rtc
> 9: 0 0 IO-APIC-level acpi
> 12: 4934 5240 IO-APIC-edge i8042
> 14: 9894 2502 IO-APIC-edge ide0
> 15: 1160 126 IO-APIC-edge ide1
> 169: 0 0 IO-APIC-level uhci_hcd
> 177: 0 0 IO-APIC-level Intel ICH5
> 185: 12927 11089 IO-APIC-level uhci_hcd, uhci_hcd,
> radeon@PCI:1:0:0
> 193: 0 0 IO-APIC-level uhci_hcd
> 201: 60 0 IO-APIC-level ehci_hcd, eth0
> 209: 12918 13859 IO-APIC-level CS46XX
> 225: 0 0 IO-APIC-level SysKonnect SK-98xx
> NMI: 0 0
> LOC: 416281 416194
> ERR: 0
> MIS: 0
>
> After:
>
> CPU0 CPU1
> 0: 118186 0 XT-PIC timer
> 1: 119 0 XT-PIC i8042
> 2: 0 0 XT-PIC cascade
> 5: 2571 0 XT-PIC uhci_hcd, uhci_hcd, CS46XX
> 8: 1 0 XT-PIC rtc
> 9: 0 0 XT-PIC acpi
> 10: 6104 0 XT-PIC uhci_hcd, uhci_hcd,
> radeon@PCI:1:0:0
> 11: 7 0 XT-PIC ehci_hcd, SysKonnect
> SK-98xx, eth0
> 12: 3566 0 XT-PIC i8042
> 14: 9236 0 XT-PIC ide0
> 15: 947 0 XT-PIC ide1
> NMI: 0 0
> LOC: 118089 118174
> ERR: 0
> MIS: 0
Evidently a recent Intel system. Is it a P4 with hyperthreading or does
it have multiple Xeons in?
You'll notice how all the interrupts go to one logical processor now.
That's not really a problem in a system with a single hyperthreading
CPU, but it makes an otherwise SMP system somewhat asymmetric (i.e.
there *might* be a small performance implication here).
You've evidently got an ATi graphics card. Which one? Have you loaded
any drivers for it that *didn't* come with Fedora Core?
If that doesn't stabilise the system, and you do have a single
hyperthreading Pentium 4, you might try booting with the non-SMP kernel.
Do let us know how you get on.
James.
--
E-mail address: james | DON'T be put off by "horror stories" spread by
@westexe.demon.co.uk | others. People who talk about death and serious
| injury are very rarely the ones who have actually
| suffered such things. -- Adrian Plass
