I have a 200m link in place and I'm only seeing 8 mbits of through put.
The devices involved are Soekris Net4511 486/100 machines running MT 2.8.28 with netgate 802.11b/g cards. Each has a cable run of 30' or 40' and a 19dB solid parabolic antenna. I've added bandpass filters and this made no difference. There is a very lightly loaded cell with an antenna about six feet behind one of the parabolics, but it would have no traffic in the evening which is when I tested.
I'm surprised given the antennas, distance, and very low noise floor that I didn't get a much, much faster link. Can anyone suggest ways to tune this for more throughput?
This is the config I am using, /int wireless reg pr is further down and seems to show a good link:
i had the same problem…
bad performance with my soekris boards and wireless.
i got a new powersupply…
that fixed the problem…
i used to have a 14V 800mA powersupply for them…
i now run them with a 12V 1.5A and they work like a charm…
ps must say…
if you want to go G or turbo don’t use the 4511 or so… go for the 4801 because the 45 series can’t handle the traffic well…
i have a REAL thruput of about 26Mbit wifi and i have a thruput of about 33Mbit on the ethernet ports… with a 4501
and thats only a 100Mhz cpu running 2.9.8
i must say for running 80Mbit ethernet side i use 4801
I see Tully says 2.9 but I also see people reporting problems. 2.8 is stable and mature. Are we sure that 2.9 is the right move? I’d rather have a solid megabyte through it than double that speed with issues.
Is the Soekris 4511 not enough CPU for that throughput? That is a hassle, as I’ve got cardbus cards so we’d be talking 4801s, miniPCI, etc. What is the maximum I can put through a 4511?
Why would a power supply matter? FYI one side has POE, the other has whatever the cheap barrel connector style supply was last year. I’ve got some new supplies for 4801s that are 12.0v 1.5 amp - this is the right thing to try?
I can’t comment on the speed of the 486 on 2.9 as I haven’t tried this yet…the reported speeds seem a little on the high side but I won’t know til I try it.
Basic rates need to be set at the lowest transmit rate. You have locked yours in at only the highest 54Mb. Try setting the supported rates to 6,54 and the basic rates to 6.
FYI, if you ever plan on using a 4801, note that they don’t support POE!
i noticed the powersuply… problem.. on the Soekris boards…
after i upgraded from a 65mW to a 200mW minipci…
i still had wifi… but my thruput went from 26Mbit to about 3Mbit and really unstable.
i put the old card in again, and i had my old speed back…
played with diferent cards…
then i tried a 400mw card … and gess what, no wifi at all
so i started wandering, that maybe i didn’t had enough power for the wifi cards…
and yes.. i replaced my POE adaptor that was 14v 0,75A with a normal adaptor 12V 1,5A
and yes, my 65mw card works, my 200mW cards also works now…
my 400mw no i have wireless but with bad performance…
so … i’m pretty sure it’s a powerproblem…
i had the same problems with the 4801 and the 4501 and the 4511
i made my own POE adaptor with a higher rating, and now everything runs stable…
I could use a even powerfull adaptor, but i actually don’t need the 400mW card in the soekris board.. the 200mW is more then enough for my needs…
as foor the speeds i posted, these are real speeds between 2 MT soekris boards… tested with the winbox tool…
keep in mind, this is interface to interface speed of my wifi link… (about 300m) so no natting or routing rules are applied.
from the MT ethernet to the other ethernet MT over the wifi link i get about 20Mbit with 100%CPU
I set the wireless back up so it had all rates as both basic and supported. It spent a few minutes negotiating its way up from 12 meg to 54 meg. I still get about a megabyte of throughput. I’ll try the power supply swap next.
OK - I went to the 1.5 amp power supplies and upgraded to 2.9.8.
I found that the Soekris 4801 with Hitachi microdrive is limited to 1.0 mbytes/sec throughput on the drive channel - this is the machine I was using to test throughput. Using my IBM Thinkpad T20 this link allowed 2.0 - 2.2 mbytes/sec.
I examined the processor utilization on the Soekris 4511 and found it to be 98% - 99% when pushing it that hard. I am going to give the customer pricing on Soekris 4826s to upgrade that link.
don’t run the bandwith test on the soekris it self…
use pc’s on both sides with the MT bandwith test server you can find in the download section…
or you will have verry bad values…
it seems generating the traffic on soekris doesn’t go well…
