-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Oh, forgot to mention that there was no performance difference when using unencrypted network vs using WPA2. We were getting around 75mbit/s with either setup. Anton On 06/11/2010 08:23 PM, Eric Perko wrote: > Anton, > > I was able to do some tests with the N router I have at home (WRT300n > running DD-WRT) and WPA2 Personal encryption, and it sadly didn't look > so good. Using iperf, measured speeds from a Thinkpad client with the > Intel 4965agn to one of those Asus cards in my desktop, iperf only > reported speeds around 1.5 Mbits/s (yup... those are the right units). > I was able to get full 95ish Mbit/s out of a 100Mbit Ethernet link, so > iperf should be functioning fine. I did notice that iwconfig only > reported a bitrate of 54Mbits/s for the 4965, and I was able to bump > it to some sort of auto mode and get speeds of around 50Mbit/s to a > wired iperf server where I had previously gotten 3-5 Mbit/s. All of > the systems involved are running Ubuntu 9.10 x64. My current > hypothesis for the less than spectacular speeds reported by iperf is a > combination of a few things: > > * Poor autoconfiguration of the wireless N cards by Linux > * Running my home router in a mixed mode because we have a few G-only > clients, so maybe we cannot do full N speeds anyways > * Tons of wireless interference in my apartment building... there > really aren't any wide open channels between 1-11, so interference may > be an important factor > > I plan on trying to test the latter two once the lab N router > reappears (it seems to have been loaned out and hasn't come back yet). > I would also like to try it on an unencrypted network and see if that > increases the speeds. The first is trickier and will require finding > the right iwconfig commands... the ones I tried quickly with the Intel > card didn't seem to put it into an N mode. > > Though I did successfully change my rate on the Intel card to some > sort of auto rate, I was unable to set it to a wireless N speed. Does > anyone else have a wireless N setup (preferably N-only) that they > could report the output of `iwconfig` for the bitrate value? > > I guess the moral of the story from these tests is that just because > there is some N equipment doesn't mean we are getting anything close > to N speeds... > > - Eric > > On Wed, Jun 9, 2010 at 11:48 PM, Antons Rebguns wrote: > Eric, > >>>> We've been using one of these >>>> http://www.newegg.com/product/product.aspx?Item=N82E16833320048 in our >>>> system and it has been working quite well with Ubuntu 9.10. I can't >>>> really comment on it's full speed potential doing 802.11n, as we only >>>> have a WRT54G router, but it hasn't dropped out or had any problems >>>> being recognized by Ubuntu like some of the other cards/USB adapters >>>> we tried. Also, it goes on sale at MWave every so often for about $12, >>>> which is helpful if you don't have a huge budget for Wifi cards. > > Actually we do have a pretty good wireless G setup, I was thinking about something faster like wireless N. We do have an > Intel 4965agn card that should support N speeds, but I was unable to get it to run any faster than G speeds (steady 60 > mbit/s though). > >>>> >>>> I could run some bandwidth tests or something with our WRT54G if you >>>> give me some commands to run on each computer. I might also be able to >>>> try it on a WRT610n, if I can find it in the lab. >>>> > > That would be great if you could test wireless N setup if you have one available. We have been using iperf to do > bandwidth tests. It's in Ubuntu repos, just do "sudo apt-get install iperf". Then on one computer run "iperf -s" and on > another run "iperf -c IP_ADDRESS_OF_ANOTHER_COMPUTER". > > Thanks! > Anton > >>>> - Eric >>>> >>>> On Wed, Jun 9, 2010 at 8:36 PM, Antons Rebguns wrote: >>>>> Hello ROS users, >>>>> We are updating our networking setup and I was wondering what other >>>>> people/labs use on their robots? Something that is well supported in Linux >>>>> and is fast, since network traffic is pretty significant with all the >>>>> sensors/cameras running on the robot. >>>>> Thanks, >>>>> Anton >>>>> _______________________________________________ >>>>> ros-users mailing list >>>>> ros-users@code.ros.org >>>>> https://code.ros.org/mailman/listinfo/ros-users >>>>> >>>>> >>>> _______________________________________________ >>>> ros-users mailing list >>>> ros-users@code.ros.org >>>> https://code.ros.org/mailman/listinfo/ros-users > >> -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.10 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAkwTAscACgkQ1B2I24nMQmrdwQCffjAKQZMiOaJUZgaSfNBhCSNl JgYAnR/kSssQglpPVugZWHCofe3r+LKW =EhVj -----END PGP SIGNATURE-----