On 2016-09-23 11:40:46 [+0000], Koehrer Mathias (ETAS/ESW5) wrote: > Hi Sebastian, Hi Mathias, > The code that is causing the long latencies seems to be the > function "igb_watchdog_task" within igb_main.c (Line: 4386). > This function will be called periodically. > When I do a return at the beginning of this function the additional latency is not seen. > In particular that function calls "igb_has_link" which seems to be one candidate that is > causing additional latency. > Do you have any clue how this code can be executed properly without causing the > additional latencies? Nope. The watchdog function is invoked via schedule_work() so it should not be blocking anything. There is no preempt disable or anything like that. Could you narrow it down further? The igb_has_link() seems also small and simple. > Regards > > Mathias > Sebastian -- To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
