...
Notes:
1: Some vipers have a large pc104 interrupt load. Occurs with both Sep 14 (a1,a8) and the Oct 4 (a5) kernels.
2: Not completely sure why on m21 the IRQ3 load is less than the pc104 load. Perhaps that version of the pc104 irq routine exits if pending bits are 0.
3: High USB interrupts are seen on vipers with bluetooth radios interfaced via USB. Not on Titans. Assume it is due the different interfaces. On a1-19 Vipers, only bluetooth radios are on USB. On Titans a1-19, bluetooth and flash drive are on USB.
4: On c20,m21, m22, USB is used only for flash drives
The only titans with PC104 serial are a3 and m22. They're both OK.
The big question is what is wrong with why the huge PC104 interrupts interrupt load on a1, a5, a8 and m21. Previously traced this to a floating CTS/RTS line, but I don't think that is the reason. Saw high interrupt load on m21 even with the ribbon cables disconnected from the Emerald headers! Will have to investigate those systems back in the lab.