Channel Bonding and TEQL question

Somsak Sriprayoonsakul ssy at prg.cpe.ku.ac.th
Thu Feb 14 13:56:50 EST 2002


	Hello, I am building 4 nodes cluster, each with the following
specs.
CPU: Athlon 1700+
Memory: 512MB
M/B: Asus A7V
Network Card: 2x Compex Readylink 10/100 (RTL8139 driver).
	network switches are
Switch: 2x Compex 10/100mbps SRX1216A switch
	I am trying to connected all nodes together using Channel Bonding
or
TEQL to merged two ethernet cards into virtual one. The creation process
goes
well but performance result is bad: Bandwith is lower compare to using
only
one network card!. Here is all details of what I am doing.

Platform: RedHat-7.2 with updated kernel 2.4.9-21 without any patch or
recompile.
Benchmark Tester: IPERF from http://dast.nlanr.net/Projects/Iperf/
Test method: I created bond0 device using command-line (not using
ifcfg-bond0
MASTER and SLAVE in network-scripts) by.
	On Machine #1:

	modprobe 8139too
	modprobe bonding
	ifconfig bond0 192.168.0.1 netmask 255.255.255.0 up
	ifenslave bond0 eth0
	ifenslave bond0 eth1

	On  Machine #2:
	Did the same thing except IP is 192.168.0.2

	Sorry that I did not kept the result of ifconfig, but the outcome
seems ok. A little weird that eth1 also has the same MAC as eth0 and
bond0.
And things is work out. I can telnet/ssh/rsh to other end. And the
link/act
led on both switch is beeping. So I ran IPERF.
	On Machine #2:
	iperf -s

	On Machine #1:
	iperf -c 192.168.0.2

	I try it about 5 times and the average bandwith is only about
60-70
Mbps. So I suspect the performance of each cards. But from IPERF the perf.
of
eth0 and eth1 is about 85-95Mbps.
	Next, I try TEQL but the performance is almost the same
(55-65mbps).
Here are the commands.
	modprobe 8139too
	modprobe sch_teql
	tc qdisc add dev eth0 root teql0
	tc qdisc add dev eth1 root teql0
	ifconfig teql0 192.168.0.x netmask 255.255.255.0 up

	Note that, There are some errors (about 5) and overrun (about 15)
packets on both eth0 and eth1 after heavy test. And I also tested all on
2.4.7-10 kernel comes with RedHat-7.2. What did I do wrong?


Somsak




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