cvs commit: src/sys/dev/pccbb pccbb.c

[M. Warner Losh]

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
output.

Warner