RE: [PATCH] 2.4.23-pre4 add support for udma6 to nForce IDE drive r

[Allen Martin]

> Interesting; lots of ACPI edge-triggered interrupts:
> 
>   dagda:~# cat /proc/interrupts 
>              CPU0       
>     0:     519365    IO-APIC-edge  timer
>     1:      16713    IO-APIC-edge  keyboard
>     2:          0          XT-PIC  cascade
>     8:          4    IO-APIC-edge  rtc
>     9:          0   IO-APIC-level  acpi
>    14:     863415    IO-APIC-edge  ide0
>    15:     201651    IO-APIC-edge  ide1
>    19:     306188   IO-APIC-level  nvidia
>    20:      57261   IO-APIC-level  usb-ohci, eth0
>    21:          0   IO-APIC-level  ehci_hcd, NVidia nForce2
>    22:          3   IO-APIC-level  usb-ohci, ohci1394
>   NMI:          0 
>   LOC:     519312 
>   ERR:          0
>   MIS:          0

Your interrupts look fine, this is the way they should be.


> ... but no stability problems since the primary drive has been
> running at UDMA133. Earlier UDMA100 freezes were completely
> repeatable; identical kernel, just without your two patches.

You can try downgrading your drive to udma5 to see if udma6 really does make
it more stable (hdparm -X udma5 /dev/hdX) but I can't think of any reason
why it should.

> I take it that I should boot with noapic in future to be safe.

I've been telling people to disable APIC / ACPI because of the interrupt
problem, but your interrupts are fine, so I'd leave it alone.  I'm curious,
what version BIOS do you have?

-Allen
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