On Wed, Jun 13, 2012 at 12:02:53PM -0700, Erik E. Fair wrote:
> hme0 at sbus0 slot 1 offset 0x8c00000 level 4 (ipl 7): Sun Happy Meal
> Ethernet (SUNW,hme)
> nell0 at sbus0 slot 3 offset 0x0 level 4 (ipl 7) level 7 (ipl 13): rev 1
Usually the following sequence:
1) rx packet arrives while the isr is running and is processed then.
2) isr runs again and finds no ring entries to process, exits quickly.
3) isr exits before irq line has actually dropped, cpu interrupted again.
Can happen due to cpu store buffer and posted writes (maybe some on
the hme card itself).
David
--
David Laight: david%l8s.co.uk@localhost