On Wed, Jun 13, 2007 at 10:31:41PM -0500, David Young wrote:
> Could you have exhausted mbufs?  Is OACTIVE set?

Definitely not exhausted mbufs.  Not sure about OACTIVE, but I doubt it.
The system had just booted and was basically idle--just running ntpd.

> Does ath0 share the PCI bus with any other device?  Does it share an
> interrupt?  Does pcictl(8) indicate any PCI bus errors on the ath0?

Ugh.  It's on the same bus as vga0 and does share "irq 11" with a
few devices, but does not share an ioapic pin with anyone:

ath0 at pci6 dev 3 function 0
vga0 at pci6 dev 5 function 0: ATI Technologies Radeon 7000/VE QY (rev. 0x00)

aac0: interrupting at ioapic1 pin 0 (irq 11)
aac1: interrupting at ioapic2 pin 0 (irq 11)
uhci0: interrupting at ioapic0 pin 16 (irq 11)
ath0: interrupting at ioapic0 pin 20 (irq 11)

It's the irq that counts, right?  (amd64)  I don't know much about
how the modern PC interrupts are supposed to work.
I'll see if I can twiddle the interrupt mappings in the BIOS or something.

I don't see any errors in the pcictl dump.

> When the net stalls, is ath0 still interrupting at all?  Does it
> interrupt non-stop?
> 
> If you enable a bunch of net80211 and ath debugging, does any event
> correlate with the stalls?

I'll take a look.

-allen

-- 
Allen Briggs  |  http://www.ninthwonder.com/~briggs/  |  briggs@ninthwonder.com