Re: [Madwifi-devel] Max throughput? Bonding? WDS? Turbo?
Status: Beta
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From: Shane S. <sh...@bo...> - 2004-03-24 18:03:24
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On Wed, 2004-03-24 at 08:52, Daniel Prather wrote: > Just a few quick questions. All more or less unrelated I guess. > > What's the max throughput anyone has gotten with madwifi? So far my > experience has been 21-22mbps on 802.11a using some card with the > Atheros a/b/g chipsets. Has anyone gotten faster? These are only about > 10 feet apart too, with external antennas, and nothing but air between > them. Same here. > Has anyone been able to bond two or more cards together to achieve > higher throughput? I've tried it with ifenslave and bonding in the > kernel, but it thinks they're ethernet cards (which I guess makes sense > because bonding is usually for ethernet) and tries to set the cards to > full duplex and 100mbps. Needless to say, this doesn't work. I did the same.. to the point of wanting to hack madwifis driver to report speeds via fake MII registers.. however it was simpler to hack the bonding driver and set the speeds manually.. which I did. I then bonded two vtun ethernet style tunnels over two wireless links (802.11a and 802.11g) running at symetrical speeds.. I was able to get barely any better throughput and claim now that its just hard to use unstable bitrates and bonding to do what you want. Here is my solution for bonding. I used two vtun ppp tunnels in multilink mode (ask me more about the config if you like) and was able to achieve a bonded, faster, connection with redundancy.. which is all I wanted.. However the sbc I am using isn't able to push more than 50MBps burst to any one pci device.. the PPP connection itself using vtun used up too much CPU on these poor boards as well.. I got a nice 26MBps redundant link. I could easily see that getting close to double the TX rate of the two cards (lowest card rate limits the entire connection) if I had better hardware. > Next, is WDS present in any of the madwifi builds currently? I know > that it was talked about before, someone had written stuff for it was > not incorporated into the official repository. Is there anything other > than WDS that can be done to make two access points talk to one > another? Or does anyone know if WDS will happen very soon? Search the list.. we all want it.. we can't have it yet.. > Lastly, is it possible to get Turbo mode in 802.11a to work on user-defined > channels? It seems to only work on somewhere around 5.2 or 5.3GHz and refuses > to let you set the channel to anything else. I'd like to see if I could make > it operate in the 5.725 to 5.825 GHz range. No clue ;) > Thanks for any information you guys can give me! I appreciate it :) NP Shane Spencer |