Yep. There is a lot of overhead, and there are also limitation in the connection between the host and the network interface. You should upgrade to a newer OS image, however, You want to have the latest libertas firmware (this may not improve the performance, but it makes your results more relevant...)
At best, I expect to see around 20 Mbps. 12 - 16 Mbps isn't bad. On XO-1.5, the SDIO interface limits you to around 18 Mbps tops. Cheers, wad On Nov 13, 2009, at 12:06 PM, Andrés Nacelle wrote: > Hello fellows, I´ve been working some time ago on the maximum > throughput you can get from an XO on it´s wireless and I got some > interesting results, on which I still have to work but I would like > to share with you to know if I´m trying to invent the wile again. > But first the conditions, I´ve been using an XO 1.0 with Q2E35 > firmware and image 801, the distance to the AP is less than 3m and > the noise lv -91dBm. > > Now the interesting part, the test and the data. > Basically what I did was measure the throughput that a XO can reach > using for this the iperf. > I configured an AP in order to only admit the maximum rate (11Mbps) > from 802.11b and everything went ok, the max throughput achieved > was 5,9 Mbps when the max thr with a 1500 Bytes package size is 6,3 > Mbps. > Now comes the interesting, when I did the same with 802.11g setting > the rate at 54 Mbps te XO reached 14,5 Mbps which belongs to a > 24Mbps rate, so I tried to do the same in that rate but the throughput > was 10.0 Mbps. During the measures I watched the connection rate on > the XO and was the proper one. > My theory (and yet to check by package capture ) is that the > maximum size package is not getting above 600 bytes. I did the math > and plotted throughput vs package size for different rates and the > results are congruent with my theory. > After making some captures I´ll tell you. > > Bye > > > -- > Andres Nacelle > Plan Ceibal - Investigación y Desarrollo > Avda. Italia 6201 > Montevideo - Uruguay. > Tel.: 601 57 73 Int. 213 > E-mail : [email protected] > _______________________________________________ > Devel mailing list > [email protected] > http://lists.laptop.org/listinfo/devel _______________________________________________ Devel mailing list [email protected] http://lists.laptop.org/listinfo/devel
