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marek-sezemsky / coreemu

Automatically exported from code.google.com/p/coreemu
BSD 2-Clause "Simplified" License
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ebtables rule unnecessarily added to switch/hub nodes #224

Open GoogleCodeExporter opened 9 years ago

GoogleCodeExporter commented 9 years ago 
an empty ebtables rule/chain is created for every LxBrNet

the ebtables rules are really only used for the WlanNode when using the basic 
range model, for on/off connectivity

some quick tests suggest that this may have a negative impact on performance 
for hubs/switches, where ebtables chains are not used:

*TWO PCs CONNECTED BY SWITCH*

 iperf -s
------------------------------------------------------------
Server listening on TCP port 5001
TCP window size: 85.3 KByte (default)
------------------------------------------------------------
[  4] local 10.0.0.21 port 5001 connected with 10.0.0.20 port 50846
[ ID] Interval       Transfer     Bandwidth
[  4]  0.0-10.0 sec  3.57 GBytes  3.07 Gbits/sec
[  5] local 10.0.0.21 port 5001 connected with 10.0.0.20 port 50855
[  5]  0.0-10.0 sec  4.27 GBytes  3.67 Gbits/sec
[  4] local 10.0.0.21 port 5001 connected with 10.0.0.20 port 50875
[  4]  0.0-10.0 sec  4.39 GBytes  3.77 Gbits/sec
[  5] local 10.0.0.21 port 5001 connected with 10.0.0.20 port 50878
[  5]  0.0-10.0 sec  4.33 GBytes  3.72 Gbits/sec
[  4] local 10.0.0.21 port 5001 connected with 10.0.0.20 port 50879
[  4]  0.0-10.0 sec  4.26 GBytes  3.65 Gbits/sec

*TWO PCs CONNECTED BY SWITCH* - with ebtables chain manually removed

n4.conf# iperf -s
------------------------------------------------------------
Server listening on TCP port 5001
TCP window size: 85.3 KByte (default)
------------------------------------------------------------
[  4] local 10.0.1.21 port 5001 connected with 10.0.1.20 port 42657
[ ID] Interval       Transfer     Bandwidth
[  4]  0.0-10.0 sec  4.54 GBytes  3.90 Gbits/sec
[  5] local 10.0.1.21 port 5001 connected with 10.0.1.20 port 42658
[  5]  0.0-10.0 sec  4.44 GBytes  3.81 Gbits/sec
[  4] local 10.0.1.21 port 5001 connected with 10.0.1.20 port 42662
[  4]  0.0-10.0 sec  4.45 GBytes  3.82 Gbits/sec
[  5] local 10.0.1.21 port 5001 connected with 10.0.1.20 port 42663
[  5]  0.0-10.0 sec  4.39 GBytes  3.76 Gbits/sec
[  4] local 10.0.1.21 port 5001 connected with 10.0.1.20 port 42672
[  4]  0.0-10.0 sec  4.44 GBytes  3.81 Gbits/sec

Original issue reported on code.google.com by ahrenh...@gmail.com on 27 Aug 2013 at 5:02