Date: Mon, 17 Jun 2002 19:07:59 -0400 (EDT) From: Gopinath KN <gopi@research.bell-labs.com> To: <freebsd-net@freebsd.org> Subject: ti0 Gigabit driver Message-ID: <Pine.SOL.4.33.0206171856400.9974-100000@aura.research.bell-labs.com>
next in thread | raw e-mail | index | archive | help
Hello All,
I am noticing that a FreeBSD router is dropping many packets
in the ip_output() routine (when called from ip_forward()).
It was confirmed by "packets not forwardable/packets dropped
due to lack of mbufs etc." messages of "netstat -s -p ip".
The correponding output interface is the Netgear Gigabit (ti0).
The giagbit driver sets the interface queue (if_snd of the ifnet
structure) to a value which is 512 (The TX ring count of the NIC).
This queue is where the packets are being dropped from.
Can I increase this value to a larger number (say, 1024)?
I am not sure what side-effect this is going to have as this
might involve playing with some device memory. Does the
NIC hardware/software assume that this value should not be
beyond the maximum TX ring size (512) as indicated in
one of the headers?
Otherwise, can you suggest anyways of reducing/eliminating
these drops - the CPU is not saturated - it is atleast 20% idle.
Thanks,
Gopi
PS: Kindly CC replies to me.
To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-net" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?Pine.SOL.4.33.0206171856400.9974-100000>