Thanks for the input. I had found the debug switch and it pointed out some
issues. Drops at the routing node are many. It seems to work at debug rate
so I hope it is not a buffer pool issue.
At 05:46 AM 4/25/2007, Michael S. Tsirkin wrote:
> Quoting Bryan Lawver <[EMAIL PROTECTED]>:
> Subject: IPoIB forwarding
>
> I have a small test bed with 2 nodes with IB/OFED1.2/connected mode and a
> third node which has IP only and is connected to one of the IB nodes. In
> between are DDR IB switch and 10GE IP switch. The node with both IP
and IB
> interfaces is simply a IP router in this test setup. The IB only node has
> a subnet route to router node and the IP only node has a subnet route to
> the router node.
>
> When I launch an Iperf test from the IB (IPoIB) node to the IP node, I get
> very good throughput with no tuning (7.5gbs).
>
> When I launch from IP to the IB node, I get virtually no thorughput
> (2.5mbs). When I dropped the window size to 8k (iperf -w8k) the
throughput
> is 750mbs.
>
> Any suggestions, ideas?
Some troubleshooting tips:
Are some packets lost on the router? Checking packet counters
might give you a clue.
Do you see some errors on one of the IB nodes?
Set debug_level=1 module parameter for ib_ipoib, and check
dmesg output while running the test.
--
MST
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