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Date: Mon, 31 Jan 2005 10:23:50 -0800
From: Sam Leffler <sam@errno.com>
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To: Martin <nakal@web.de>
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cc: stable@freebsd.org
Subject: Re: Interrupt load high after 73 minutes uptime with ath(4) hostap
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Martin wrote:
> I'm running:
> FreeBSD 5.3-STABLE FreeBSD 5.3-STABLE #0: Mon Jan 31 00:54:51 CET 2005
> i386
> 
> The card is (Netgear WG311T):
> ath0: <Atheros 5212> mem 0xe7000000-0xe700ffff irq 9 at device 15.0 on
> pci0
> 
> After about 73 minutes uptime my PC is busy processing interrupts.
> Top shows 90% in IRQ. Everything is slowed down. Earlier kernels
> showed same effect.
> 
> When the problem appears, I start "ifconfig ath0 down" then
> "ifconfig ath0 up" and everything is ok again for a certain
> period of time.
> 
> Further info:
> IRQ 9 is being shared with ACPI (I tried to turn off ACPI, no effect).
> Earlier it was shared with my VGA-card, but showed exactly the same
> symptoms.
> 
> The high interrupt load is not being reported like e.g. an interrupt
> storm on lpt. The system is simply slowed down.

This is a known problem in the ath driver in stable that should be fixed 
in current.  I expect you are operating 11g.  Unfortunately backporting 
the necessary changes is very hard and not something I intend to do.

	Sam