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[James Wilkinson]

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 at 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 at 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.

-- 
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