Hi,
i have been looking at how often a packet which is sent to
an ethernet driver is split over multiple mbufs, and it
seems that this happens for the vast majority of
packets -- basically everything above MHLEN goes into
two mbufs, and MTU-sized TCP packets end up using 3 or
more mbufs.
This is on 4.2, and using ttcp to generate traffic, and
ipfw which defaults to accept everything.
I seem to remember that there was code at least in TCP which
tries to leave room for the link and ip headers, but
somehow this seems to fail...
Has anyone else noticed this behaviour ?
cheers
luigi
----------------------------------+-----------------------------------------
Luigi RIZZO, [EMAIL PROTECTED] . ACIRI/ICSI (on leave from Univ. di Pisa)
http://www.iet.unipi.it/~luigi/ . 1947 Center St, Berkeley CA 94704
Phone: (510) 666 2927
----------------------------------+-----------------------------------------
To Unsubscribe: send mail to [EMAIL PROTECTED]
with "unsubscribe freebsd-net" in the body of the message
