em0 and tunnel performance problem

OxY oxy at field.hu
Wed Dec 28 04:38:35 PST 2005

after digging deeper it found out that the whole em0 driver worth nothing...
when i set the media to auto it's operating in half duplex (i found out 
after a couple of
benchmarks with iperf), when i set it to 100basetx and full duplex manually 
the result is
any idea?

----- Original Message ----- 
From: "OxY" <oxy at field.hu>
To: <freebsd-performance at freebsd.org>
Sent: Wednesday, December 28, 2005 9:22 AM
Subject: em0 and tunnel performance problem

> hi!
> i have an intel etherexpress gigabit card on 100mbit port and fbsd 
> 6.0-p1..
> my box is a proxy, it's traffic is 100/100mbit constant..
> unfortunately i have to use tunnel and that is the source of my problem.
> when i enable the tunnel and the packages are going through it the 
> performance is poor..
> it seems that it's not full duplex, the speed is around 50/50mbit, and 
> have 10-15% packet loss..
> i tried to enable/disable polling, and used these sysctl vars:
> kern.polling.enable=1
> kern.ipc.somaxconn=2048
> net.inet.tcp.inflight.enable=0
> net.inet.ip.portrange.randomized=0
> net.inet.tcp.sendspace=65536
> kern.ipc.maxsockbuf=786432
> net.inet.tcp.delayed_ack=0
> net.inet.tcp.newreno=0
> net.inet.ip.intr_queue_maxlen=1024
> net.inet.tcp.blackhole=2
> net.inet.udp.blackhole=1
> net.inet.ip.rtmaxcache=1024
> without tunnel the speed is 100/100mbit, great.
> ps: with linux its all OK, but i wanna use fbsd :)
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