On Sat, Dec 20, 2008 at 9:42 AM, Daniel Wu <dyqith@xxxxxxxxx> wrote: > > Hi, > > We are running into some unexpected results in performance tests of an > Intel 5300 abgn against a Linksys wrt310n. Any help would be greatly > appreciated. > > Using the debugfs and writing a fixed rate hex into the > rate_scale_table, we tested the throughput (with iperf UDP mode) > between the Intel 5300 card to another wired laptop through the > wrt310n. > > As far as we can tell, legacy cck, ofdm and siso performance are fine. > We're running into problems when trying to set up triple streams and > three antennas (mimo3). > > We're using these hex rates for mimo3: > 0x1C110 > 0x1C111 > 0x1C112 > 0x1C113 > 0x1C114 > 0x1C115 > 0x1C116 > 0x1C117 > For each of the rates, we're getting approximately 160Kbps which is far too low. > These rates also seem to cause a "Invalid HT rate index 236" in dmesg. iwl-agn-rs.c doesn't support actively MIMO3 yet, the algorithm need to be enhanced in one more dimension. > > At first we thought the 5300 may not be able to do 3 streams at once, > but that's not true, since the device can receive from the AP at much > higher rates (~64.5Mbps) RX is relatively passive element so this should work. > > > Also, in iwl-commands.h, there might be a typo on line 258, instead of > bits "3-0", it should be at least bits "6-0" Right, You can post directly a patch that fixes this. Tomas -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
