watchdog timer

Bob Ciotti
2012-05-18T06:05:14Z

I'm seeing lots of these messages in SM log:

May 17 22:36:04 947774 [DA234710] 0x01 -> log_trap_info: Received Generic Notice type:1 num:131 (Flow Control Update watchdog timer expired) Producer:2 (Switch) from LID:444 Port 5 TID:0x0000000000000025

the referenced port is a switch to HCA link.

I've seen this in cases where there was bad hardware. Spec says failure in flow control machine on other end. But lets assume hardware was good. When could this occur?
Only in the case of FW bug? Any tunable's that might impact this?

bob