[MLB-WIRELESS] Re: [mesh] Transfer Rates

[Mark Allen]

I have done some tests here as well (all this discussion about speed has caused me to get out my ftp program and transfer some files around the place !)

Test 1: 10mbps Hub to WL400 (75mw to 2 x 10dbi Omni's) when I have a 11mbps Signal.

Transfering from a PC (with a 10/100 card) to a half duplex hub onto the wireless back to the client I get 240-280KBps with 1mb 2mb 5mb 10mb 20mb files.

Test 2: Client to Wireless AP to Wireless AP to Client

Regardlesss of what I did they maxed out at 280KBps. Min was 75Kbps

Test 3: Ping -f ( he he) from 6 machines on the network to the AP, then transfer files, still 280KBps max min 220KBps...

Looks like thats it max speed.... still its nice !!

Mark

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Mark Allen -- Alarm Systems Service Technician
0408917504 -- 0738491939 -- 0738497228
Techncian -- ABC Alarms Pty Ltd
Operator -- MPAP, Brisbane Queensland
marka at abcalarms.com.au - redness at iname.com
BCL Reg - B10539QLD Adv Diploma of Info Tech
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  ----- Original Message ----- 
  From: Peter Board 
  To: mesh at itee.uq.edu.au ; melbwireless at wireless.org.au 
  Sent: Thursday, September 19, 2002 9:28 PM
  Subject: Re: [mesh] Transfer Rates


  I did a bit more testing the other night.

  On my local Windows Access point, I can get up to 260 kilobytes/sec transfer rate from my laptop with a wireless card through the AP to the wireless card that acts as a client on the linux router. Client -> AP -> Client - 260Kbytes/sec. Both of the client cards were in range of each other. 

  My thoughts are that because I didn't have the hidden node problem, both clients could hear each other, the transfer rate was higher. The other links to this local Access Point which are 400m links (two of them) only achieve around 75kilobytes/sec. They both have LOS. They have to route their traffic through the Wireless Card on the linux router (as previously mentioned), but in theory they should be able to do the 260 KB/sec I can with my laptop.

  Any idea's on how to speed the transfer rates up?

  Just thought I would share my findings.

  Cheers,

  Peter
    ----- Original Message ----- 
    From: Peter Board 
    To: mesh at itee.uq.edu.au ; melbwireless at wireless.org.au ; Cameron Donaghey 
    Sent: Tuesday, September 17, 2002 4:44 PM
    Subject: Re: [mesh] Transfer Rates


    Hi Guy's,

    Over on our Digicate Nodes in the Beenleigh area, this is the sort of performance I have found (I am trying to up the performance but I believe I might need to fiddle with RTS/CTS values or possibly look at some driver changes. Hidden Nodes seem to be a major factor in performance problems. There are some special windows drivers that use a Turbo Cell custom mode that only works with Karnet Access Points that are supposed to optimise the network bandwidth via some polling arrangement).

    Firstly, we find if someone is doing a major file transfer, they knock out the weaker nodes (mainly our 7.5km Client node) under the large file transfer is done. We are using an Apple Airport (Lucent Silver card 8.10 firmware) as our main AP, all other cards are Cabletron Roamabouts running 6.06 to 8.10 firmwares.

    Transfer speed

    Wired client > Client Node (linux router) > AP > Wired Client (hanging off the access poing) ~ 450 to 500 Kb/sec

    Client Node > AP > Client Node, between 75Kb to 100 Kb/sec
    Client Node (linux router) > AP > Client Node (7.5 Km link) ~ 50Kb /sec
    Client Node (7.5 Km) > AP > wired client ~ 150Kb/sec

    We also have a second access point running under Windows (with driver hacks) but it does not seem to allow the traffic to pass to the Windows PC to be routed over Ethernet. Thus we use a second Wireless Card to route traffic via this Windows Access Point. Performance seems to be between 75Kb/sec and 120 Kb/sec. If the Windows drivers can be modified to allow local routing of the traffic over its ethernet interface, then I assume we should be able to get close to 450 - 500 Kb/sec (Client -> Ap -> wired)

    Anyone know what all the values are for the lucent drivers in the registry? Anyone got a Linux AP driver for Lucent / Cabletron cards?

    Peter
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