On Sun, 2007-16-09 at 20:13 -0700, David Miller wrote: > What Herbert and I want to do is basically turn on TSO for > devices that can't do it in hardware, and rely upon the GSO > framework to do the segmenting in software right before we > hit the device.
Sensible. > This only makes sense for devices which can 1) scatter-gather > and 2) checksum on transmit. If you have knowledge there are enough descriptors in the driver to cover all skbs you are passing, do you need to have #1? Note i dont touch fragments, i am assuming the driver is smart enough to handle them otherwise it wont advertise it can handle scatter-gather > Otherwise we make too many copies and/or passes over the data. I didnt understand this last bit - you are still going to go over the list regardless of whether you call ->hard_start_xmit() once or multiple times over the same list, no? In the later case i am assuming a trimmed down ->hard_start_xmit() > UDP is too easy a test case in fact :-) I learnt a lot about the behavior out of doing udp (and before that with pktgen); theres a lot of driver habits that may need to be tuned before batching becomes really effective - which is easier to see with udp than with tcp. cheers, jamal - To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
