> On Thursday 24 February 2005 12:46, zDL Linux PPC wrote: > > I have been doing some experiments with Jumbo packets (MTU > 9000) and have > > noticed that once you exceed the 2KB fifo size, I end up > with no response > > from the box. > > > > I can ping the box with no problem at all at sizes greater > than 2KB, however > > upon further investigation I noticed packets of size 2006 > bytes causes no > > further packet to be transmitted (adding debug prints to > ibm_emac_core.c, > > the driver believes the packet has been transmitted), after > adding a further > > 42 bytes of header information this comes to the exact size > of the Transmit > > Fifo 2048 (2KB). I have also changed the Transmit Fifo > Register to 1024 > > bytes, this solves the problem at 2006 bytes however now it > has moved to 982 > > bytes of data (+42bytes of header = 1024) > > > > Has anyone else experienced this problem while either using > a smaller > > transmit fifo (512 or 1024 bytes) and MTU 1500 or a larger > MTU (>2033) and > > EMAC transmit fifo of 2048. I guess this will really apply > to people with > > larger MTU not many will decrease the Tx fifo, and I am > further guessing > > that not many are using 9000 MTU as not much hardware seems > to support it, I > > can only use it through a direct connection between PC's > and not through a > > switch! > > > > Any suggestions on how to overcome this problem??? My only > idea is to either > > add data to the packet (don't think this will work) or > forceably fragment > > the packet (if it is 2K in size) to ensure that it never > uses the exact size > > of the tx fifo..... > > Have you applied Matt Porters patch? It has been submitted at > the beginning > of this month?
No I haven't seen it on either of these lists, do you know where I can find it Thanks
