SIO Interrupt storms and unhandled interrupts

John Baldwin jhb at
Fri Sep 10 11:06:54 PDT 2004

On Thursday 09 September 2004 05:41 pm, M. Warner Losh wrote:
> In message: < at>
>             Mike Tancsa <mike at> writes:
> :          Thanks for the response!  We found a different solution /
> : approach which seems to work on both RELENG_4 and RELENG_5.  The problem
> : is that the modem is not being seen as a PCI / PUC device and instead is
> : being seen as an ISA SIO device ??  The following RELENG_5 and RELENG_4
> : patches seem to fix the problem.  I wonder if the other modems listed in
> : sio.c suffer the same fate ?
> :
> : Also fixed in this are those "cant re-use leafs" at bootup time.  The
> : modem is seen as a PUC device now....  At the bottom is a diff between
> : the boot -v
> I like this fix!  I'll see if I can find to commit it.

Note that hacking sio to not use INTR_FAST would have had the same result.  
Note that in his dmesg diff, sio4 has to fall back to normal interrupt mode.

John Baldwin <jhb at>  <><
"Power Users Use the Power to Serve"  =

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