It could be radio noise in the box, even though you may be using different channels. It could also be cpu. What percentage does your cpu get up to in top while running the tests? It would also be good to find out how much the minipci backplane in the alix will support.
Sean ------Original Message------ From: Edwin Whitelaw Sender: voyage-linux-bounces+knife=toaster....@voyage.hk To: voyage-li...@voyage.hk Subject: [Voyage-linux] Performance issue w/ALIX and 2 radios Sent: Feb 22, 2009 7:27 AM I have an ALIX with 2 Wistron DCMA-82 radios running Voyage 0.5.2 fully upgraded. Ath0 is a production backhaul and at the time of testing (this morning) was averaging about 5-8mbs. The plan was to have ath1 also carry backhaul traffic for increased capacity (and possible bonding later on). The other end of the two links are separate systems mounted less than 1m a part at about 7300m - perfect LOS. Testing the second (new) ath1 link with iperf I'm able to get right at 30mbs. However, during the iperf test on ath1, ath0 data rate drops from the 5-8mbs to a few, < 20, kbs returning back to its previous rate immediately after iperf terminates. Top also shows ksoftirqd/0 going from 0% to 70%+ during the 10s iperf. Running iperf on ath0 consistently returns numbers indicting the free overhead above the base traffic level. Running iperf -s on the board and hitting it on the ethernet side also all but stops the input on ath0 during the run. I had hoped to have the two radios happily handle 25+ mbs in parallel and route out the 100mbs ethernet port but am convinced this will not work as hoped. Has anyone run two radios at full capacity simultaneously on other hardware? Would this be a kernel or driver issue? In the short term, I will mount another ALIX system with a single radio but would dearly love to make the above arrangement work. Regards, Edwin -- <=+=+=+==+=+=+==+=+=+=+=+=+=+=+=> Edwin Whitelaw, P.E. New River Valley Unwired, LLC 2200 Lonesome Dove Dr Christiansburg, VA 24073 540-239-0318 _______________________________________________ Voyage-linux mailing list Voyage-linux@list.voyage.hk http://list.voyage.hk/mailman/listinfo/voyage-linux
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