On Wed, 27 Feb 2013 14:43:58 -0500 <kyle.bro...@l-3com.com> wrote: > Hello, > > > > I was wondering if there was a particular reason for changing the > maximum supported MTU on the ixgbe drive from 16110 to 9706? We have > a streaming video application that we would like to use 16 kbyte > frames with. I have both version 3.9.15 which supports a max MTU of > 16110 and 3.12.6 which only supports up to 9706. I tried to look for > an answer in the 82599 spec update and this mailing list and was > unsuccessful, I apologize if this has already been answered.
It was a software change to the driver intended streamline the configuration code and to enforce the networking standard jumbo frame size of 9K. When the controller is in SR-IOV mode the 82599 Virtual Functions only support 9K jumbo frame sizes so it was determined that it would be a simplification of the configuration code path to just use 9K as the limit at all times. I guess that we were unaware of the fact that anyone actually used the controller supported maximum (while not in SR-IOV mode) of 16K since it is not an industry standard. Generally frames above 9K are not routable and in many cases switches don't support frame sizes above that limit. You can modify the driver to support the 16K frame size fairly easily if you wish. I'm also copying the originator the the driver change so we can get his additional input, if any. Regards, - Greg Networking Division Intel Corp. > > > > Thanks very much, > > > > Kyle Brooks > > Member of Technical Staff > > L-3 Communications Cincinnati Electronics > > > > ------------------------------------------------------------------------------ Everyone hates slow websites. So do we. Make your web apps faster with AppDynamics Download AppDynamics Lite for free today: http://p.sf.net/sfu/appdyn_d2d_feb _______________________________________________ E1000-devel mailing list E1000-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/e1000-devel To learn more about Intel® Ethernet, visit http://communities.intel.com/community/wired
