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Joker757
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Low TCP throughput SXt5HPACD

Wed Oct 29, 2014 9:13 pm

I'm trying to get at least 200mb on these and the best I can get is about 120mb. Settings are 802.11AC only. 20/40/80. SNR 64, signal strength -46 CCQ 86/100. Any suggestions or known issues? Thanks.
 
InoX
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Re: Low TCP throughput SXt5HPACD

Wed Oct 29, 2014 9:57 pm

Don't use internal btest.
 
Joker757
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Re: Low TCP throughput SXt5HPACD

Wed Oct 29, 2014 10:26 pm

Don't use internal btest.

That's what I was using. I've tried it using LAN Test and same results.
 
Joker757
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Re: Low TCP throughput SXt5HPACD

Thu Oct 30, 2014 1:00 am

My wireless config setup. I'm totally stuck here. Thanks guys.
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Joker757
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Re: Low TCP throughput SXt5HPACD

Thu Oct 30, 2014 12:55 pm

Any suggestions on how to attain better throughput?
 
uldis
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Re: Low TCP throughput SXt5HPACD

Thu Oct 30, 2014 1:02 pm

what is the distance for the wireless link?
Try using Nv2 wireless-protocol.
 
Joker757
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Re: Low TCP throughput SXt5HPACD

Thu Oct 30, 2014 2:14 pm

what is the distance for the wireless link?
Try using Nv2 wireless-protocol.

Distance is about 150ft. I'm looking to use these to link two buildings across a parking lot. I've tried Nv2 with not much better results. I've spent two days now testing every possible configuration. Frequencies are clean. I can get decent speed testing using UDP but TCP max is about 130mbs.

My test setup is RB450G---SXT#######SXT---RB450G. Running BTest on the two 450G.
 
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CyberTod
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Re: Low TCP throughput SXt5HPACD

Thu Oct 30, 2014 2:28 pm

Check cpu usage while doing this test. I am sure it will max out generating that amount of tcp traffic.
You can even test those 450G's with 1m utp and I am quite sure the result will be the same.
 
Joker757
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Re: Low TCP throughput SXt5HPACD

Thu Oct 30, 2014 2:45 pm

Check cpu usage while doing this test. I am sure it will max out generating that amount of tcp traffic.
You can even test those 450G's with 1m utp and I am quite sure the result will be the same.
Thanks for the suggestion. I'll take a look at that today and report back.
 
Joker757
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Re: Low TCP throughput SXt5HPACD

Thu Oct 30, 2014 9:14 pm

with the 450G the side generating the traffic was at 100%. Tried with RB1100 and much better however throughput isn't getting much above 170mbs. CCQ all over the place. Also it keeps going back and forth from 40mhz channel to 80mhz channel. Appears very unstable.
 
Joker757
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Re: Low TCP throughput SXt5HPACD

Fri Oct 31, 2014 4:09 am

day 3 working on this and still can't get above 170mbs. CCQ unstable and modulation keeps bouncing to different rates. Anyone else got these working stable?
 
npero
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Re: Low TCP throughput SXt5HPACD

Fri Oct 31, 2014 10:36 am

Do you try to change frequency ?
 
Joker757
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Re: Low TCP throughput SXt5HPACD

Sat Nov 01, 2014 2:37 pm

tried every frequency
 
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sten
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Re: Low TCP throughput SXt5HPACD

Sun Nov 02, 2014 7:39 pm

Try reducing signal strength, depending on the radio chipset, -46 is a bit too strong for most radios. Your radios might want to be at -56 instead. Yes there is such a thing as too strong.
Move along. Nothing to see here.
 
uldis
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Re: Low TCP throughput SXt5HPACD

Mon Nov 03, 2014 4:47 pm

do you have clean line of sight of that wireless link?
Do you have some other 5ghz equipment near that link?
 
Joker757
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Re: Low TCP throughput SXt5HPACD

Tue Nov 04, 2014 12:28 am

yes and no.
 
lambert
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Re: Low TCP throughput SXt5HPACD

Tue Nov 04, 2014 1:42 am

day 3 working on this and still can't get above 170mbs. CCQ unstable and modulation keeps bouncing to different rates. Anyone else got these working stable?
Did you scan for other 5.8GHz device which might be operating in the area? Not yours, devices belonging to other people. 80MHz of clean spectrum is very hard to come by around here. 20MHz of clean spectrum is hard to find in that band.

CCQ and modulation bouncing, barring hardware or software defects, tells me you have noise. I would look at the scanner and frequency usage tools. RX signal levels too strong could also count as noise.

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