dummynet dropping too many packets

[rihad]

Robert Watson wrote:
> I would suggest making just the HZ -> 4000 change for now and see how
> it goes.
> 
~4000 online users, ~450-470 mbps traffic, 300-600 global drops per 
second. Same ole. Not funny at all.

net.inet.ip.dummynet.io_pkt_drop: 0
net.inet.ip.intr_queue_drops: 0
net.inet.ip.fastforwarding: 1



> Robert Watson wrote:
> Suggestions like increasing timer resolution are intended to spread
> out the injection of packets by dummynet to attempt to reduce the
> peaks of burstiness that occur when multiple queues inject packets in
> a burst that exceeds the queue depth supported by combined hardware
> descriptor rings and software transmit queue.

My last chance is to tweak the software transmit queue. Just how can I 
alter its size?

P.S.: We're definitely going to buy a 10GigE card. Like this one:
http://cgi.ebay.com/EXPX9502CX4-10-CX4-DualPort-Svr-Adap-Intel-Corp_W0QQitemZ150358746205QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item230214645d