cvs commit: src/sys/dev/pccbb pccbb.c
sam at errno.com
Thu Apr 13 16:25:15 UTC 2006
M. Warner Losh wrote:
> In message: <20060412212843.GH1258 at haakonia.hitnet.RWTH-Aachen.DE>
> Christian Brueffer <brueffer at FreeBSD.org> writes:
> : On Thu, Mar 30, 2006 at 04:25:45AM +0000, Warner Losh wrote:
> : > imp 2006-03-30 04:25:45 UTC
> : >
> : > FreeBSD src repository
> : >
> : > Modified files:
> : > sys/dev/pccbb pccbb.c
> : > Log:
> : > On some laptops, under very high loads, the socket event register read
> : > in the ISR doesn't read the actual socket event register, but instead
> : > reads garbage (usually 0xffffffff, but other times other things).
> : > This totally violates the PCI spec, but happens rarely enough that a
> : > workaround is in order. This adds one test when we have a real
> : > interrupt to service (which is very rare), and doesn't affect the
> : > usualy 'nothing to see here' case at all.
> : >
> : > Problem reported by many, but sam@ gave me this workaround after
> : > diagnosing the problem.
> : >
> : This breaks pccard/cardbus support on my Thinkpad T41p (confirmed by
> : backing this change out). With this change, I just get an "Interrupt
> : storm detected on irq 5; throttling" message.
> : What kind of debug info can I provide?
> A Thinkpad T41p. :-)
> Failing that, can you set hw.cbb.debug=1 and provide me with the
We should just back this out until we can resolve the issue. For other
folks: the change was originally done for an hp nx6125 laptop where
running a wireless card in monitor mode would cause spontaneous
interface detach's under load. It sounds like the root cause is elsewhere.
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