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Advanced Wireless Settings

Discussion in 'Tomato Firmware' started by ziddey, Jun 10, 2007.

  1. ziddey

    ziddey Network Guru Member

    I was wondering if anyone had any suggested settings for the advanced->wireless section. I've been reading around for the past hour to get some insight on what I need to be doing to get my wireless a little better.

    I'm not trying to cover a large area or anything. The main router (whr-g54s) is on the 2nd floor. There's 3 laptops also on the 2nd floor connecting wirelessly. On the 3rd floor, I have a belkin 7230-4 v3000 in wds only mode to feed two desktops. There's also 2 laptops on the 3rd floor as well. On the 1st floor, there's a ps3 connecting wirelessly.

    None of the clients support afterburner, so I've got that disabled. From what I understand, leaving the rates on their default values should be fine, and clients should connect at 54mbps.

    The area doesn't have all too many wireless signals in the area. However, that said, I still can't get a channel that's free of overlap, so the best I can do is pick a channel next to a few weak ones.

    I've tried both cts auto and disabled, but didn't see too much benefit either way. I've had frame burst on, but from what I've read, it won't help much if you have more than 1-2 clients? So would I be better off disabling it?

    Short preamble should be selected if my clients can use it?

    I've tried transmit of both 42 and 63 and didn't see much difference.

    Would WMM help me stream from my computer (on the other end of the wds) down to the ps3? And if so, no ack would help more?

    I guess my biggest questions are: distance/ack timing, dtim interval, fragmentation threshold, and rts threshold.

    Anything I should do to those?

    The belkin on wds is getting about 50 for quality according to tomato. ps3 gets about 40.



    Now, the reason I'm asking about settings... I can't currently stream to the ps3 effectively without encountering major issues. So I got ixia qcheck and ran some testing between my desktop (connected to the belkin wds) and my laptop (directly wireless to tomato).

    Running tcp throughput tests, I get anywhere between 4 and 10 mbps. That's it. I saw a screenie of someone with a long range network getting 30 even. UDP isn't any better.

    When I run the udp streaming test of 1mbps for 30 seconds, I get obscene results quite often.

    Streaming Results
    Lost Data 931008 bytes (24.8%)
    Actual Throughput 0.727 Mbps

    That's a run I just did, which is actually one of the more decent ones. It's not unusual for me to see 40%+ lost data. Of course this is completely unacceptable, and I would want to be streaming 2mbps video.

    Any ideas about this??
     
  2. M_ars

    M_ars LI Guru Member

    maybe you should consider buying some new antennas for your WRT. It does not make any sence to increase for example singal output power if there comes just a weak signal back to your AP. A new antenna could chance that, because it does not only gain the output signal. The antenne your are using right now has probably a gain of 2dB(both ways). A 5dB or 7db antenna would do a much better job.

    For example:
    http://www.linksys.com/servlet/Sate...nksys/Common/VisitorWrapper&lid=2941639789B64
     
  3. ziddey

    ziddey Network Guru Member

    Hmm, I'll take that into consideration. But the problem is that even when I place my laptop a few feet from the AP, and use my ethernet connected pc to run ixia qcheck, I still don't get more than 20mbit, and that's if I switch it to g-only mode. If I have it as mixed, I never exceed 12mbit. Laptop is running ar5006xs ar5211. Also I've tried a different laptop with a 2915abg with similar results. noise is measuring at -93, which is a whole lot better than the -80's I get on the other channels.
     
  4. M_ars

    M_ars LI Guru Member

    If you are using WDS, then the speed is totally ok. Every WDS cuts your speed in half. For example. 1 Ap + 1 WDS --> 54MBit/s : 2 ~ 25 MBit/s; Thats just how the system works.

    Explanation from the wiki:
    Wireless throughput is cut approximately in half for each WDS repeating "hop", i.e. an AP that data flows through before hitting the wired network. This is because all transmissions use the same channel and radio and must be retransmitted to reach the wired LAN.
     
  5. cgondo

    cgondo Network Guru Member

    my suggestion is that if you do not know what these parameters mean....best not to muck around with them until you really understand them. Have a google on these terms.

    They require understanding on how the 802.11 protocol works. Not trying to scare you off or something....in fact if you are really interested to learn then I am more than happy to explain but if you just wonder about your speed, I believe in this situation they wont help
     
  6. ifican

    ifican Network Guru Member

    If i remember right there have been plenty of test run in this arena and it has been right about 30Mb throughput for a wired machine. I dont recall what it has been for wireless but if you search around i am sure something will come up. You have to also take into consideration that most of these devices are for home users. In the enterprise environments i work in we generally see only about 70% max trhoughput, its just the way it is, so 70Mb on 100mb pipe, 700 on a 1Gb pipe and we currently dont have enough data to push the 10Gb links but i would also expect it to be around 70% if we have that data to measure. I have seen instances where it is slightly higher but not very often and not very long.
     
  7. K1nslayer

    K1nslayer LI Guru Member

    I had much better luck streaming media by enabling "Frame Burst", "Short Preamble" and "WMM". One of those conflicts with "Afterburner", but I don't remember the specifics. Also, make sure that you have your router setup to use QOS. Meaning that anyting going to/from the PS3 has max priority.

    My setup is a bit complicated as I have 3 routers all "bridged" so my media has to make two wireless hops to the TV. However it works now, so I'm happy.

    hope this helps.
    -Kinslayer
     
  8. K1nslayer

    K1nslayer LI Guru Member

    Forgot to mention that depending on your security settings you can drastically effect the throuput on the router. I would test with open security (not connected to the net) then turn on WPA, ect. untill the bandwidth drops to unacceptable levels.

    -Kinslayer
     
  9. ziddey

    ziddey Network Guru Member

    Well I put my pc on ethernet, but playback to ps3 is still choppy. And for sure, it's not a bottleneck in the transcoding. Even nontranscoded media is choppy and terminates.

    I thought that leaving it on long preamble will allow both long and short?

    I do have frame burst enabled, and wmm enabled. Even tried no ack to see if it'd help. And I thought qos didn't apply to the lan, and all lan traffic would be unclassified.
     

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