8641D, gianfar driver and BAD Interruptions
Hello,
On a board based on 8641D, we have BAD interruptions (cat /proc/interrupts) which means spurious interruptions seen by the MPIC. The number of this BAD ITs are increasing during the life time of the system and depending on the ethernet activity. So this seems to come from the gianfar and we experimented that:
- when we are binding the three interruptions enet_tx, enet_rx and enet_err of each interfaces on the same processor, the BAD interruptions do not increase any more.
- when we are compiling the driver without the NAPI mode, there is no more BAD interruptions at all.
We are playing with a 2.6.25 + some patches Linux kernel.
I did not analyze the errata list of 8641D with this perspective but is there anybody who get some inputs about the phenomenon ?
Regards.
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Régis ODEYE Kontron Modular Computers SA 150, rue M. Berthelot / ZI Toulon Est / BP 244 / Fr 83078 TOULON Cedex 9 Phone: (33) 4 98 16 34 86 Fax: (33) 4 98 16 34 01 E-mail: [email protected] Web : www.kontron.com