Hi,

I have configured one of my LINUX machines as a bridge. The network setup is as follows:

Machine A <-------->LINUX Bridge<-------> Machine B.


Both the links are 1 Gbps links, and so are the interfaces. Now, when I use iperf to send packets using TCP from Machine A to Machine B, it is able to go upto only 650 Mbps. Using iperf from Machine A to the Bridge machine, or from the Bridge Machine to Machine A is able to achieve 950 Mbps. And the same for the link to Machine B.

Can someone please help me understand why from A to B the achieved bandwidth is only 650 Mbps.

Thank you,
Vish

There are a lot of variables involved in here, things like window sizing and frame size. The biggest immediate win would *probably* be to enable jumbo frames, allowing 9000 bytes per packet rather than 1500, which is probably what you're using by default. your data also has to traverse netfilter rules too, which could be fun depending on what you are subjecting it to.

Take a look on the CPU load while testing...