freebsd stable - Oct 2007 - em watchdogs - OS involvement

Things just keep getting stranger... its no wonder I didn't see this...

I had been trying to repro the watchdog on a machine in my cube at work
without success, but in the test Lab they were successful. I scratched my
head for a while wondering why...

But then I realized I had the Sept snapshot in my cube, reinstalled it to
the Oct snapshot and now it watchdogs like a champ too.....

Another bit of data, if I define DEVICE_POLLING on the Oct. snap it
also will work.

SOOOOO, what changes were made to interrupts between Sept and
October, something I need to do perhaps that wasnt done??

Any ideas??

Jack

Jack Vogel wrote:
> Things just keep getting stranger... its no wonder I didn't see this...
> 
> I had been trying to repro the watchdog on a machine in my cube at work
> without success, but in the test Lab they were successful. I scratched my
> head for a while wondering why...
> 
> But then I realized I had the Sept snapshot in my cube, reinstalled it to
> the Oct snapshot and now it watchdogs like a champ too.....
> 
> Another bit of data, if I define DEVICE_POLLING on the Oct. snap it
> also will work.
> 
> SOOOOO, what changes were made to interrupts between Sept and
> October, something I need to do perhaps that wasnt done??
> 
> Any ideas??
Shared irq is a very big problem w/FAST_INTR seems to be. There are a 
lot of drops if ethernet shares IRQ w/UHCI e.g.
Maybe you've seen this issue.
> 
> Jack
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On Tue, 30 Oct 2007, Jack Vogel wrote:
> Another bit of data, if I define DEVICE_POLLING on the Oct. snap it
> also will work.
Defining DEVICE_POLLING (globally) breaks configuration of "fast"
interrupt handlers in em.  I have to #undef it to test "fast"
interrupt
handlers in em without losing testing of polling in other network
drivers.  I lose only testing of polling in em.

Bruce