> Hi Andrew, > > it is waiting for the watchdog to trigger :-) TBH the 1s seems to be too > short to for the dma ring length to be flushed and i had to pick some > value and 5 is used most places. > > it really depends on the amount of packets in the queue, their length > and the mac setting. the timeout needs to be large enough that it would > not trigger incorrectly even if the mac is on 10mbit half duplex and all > frames in the queue were maximum size.
So you are saying there is 5 seconds worth of traffic in the transmit ring. As a general point, not specific to this driver, is that wise? Isn't that really bad buffer bloat? I just wondered what happened to cause it to have 5 seconds worth of traffic in the transmit ring. Did downstream signal a pause? But i thought the byte queue limit was designed to prevent a big backlog in the transmit queue? At 10/Half, is it not reacting fast enough? Since it is half duplex, do you have a lot of traffic coming the other way and something is not being fair at distributing up and down traffic? I'm just wondering if by increasing the watchdog to 5 seconds, you are just hiding a problem. Andrew