why is the vocore's wifi speed so slow?

charliex
 
Posts: 42
Joined: Sun Nov 16, 2014 5:34 pm
Location: los angeles

why is the vocore's wifi speed so slow?

Tue Dec 09, 2014 2:58 pm

i only get about 3.5MBps to 4Mbps throughput on the various vocores, is that typical with this chipset? seems really low.

Peter H
 
Posts: 58
Joined: Wed Nov 12, 2014 10:24 pm

Re: why is the vocore's wifi speed so slow?

Wed Dec 10, 2014 1:00 am

I don't know whether it's typical for the chipset, but when I run 'time wget -O /dev/null speedtest.pixelwolf.ch' over a WiFi connection it takes about 20 minutes to download 1 GB, which I figure works out to about 6.7 Mbps - slightly faster than the figures you're seeing, but not much.

Edit to add:

The real time traffic monitor suggests that it's averaging about 7Mbps with occasional peaks up to about 15 Mbps.

charliex
 
Posts: 42
Joined: Sun Nov 16, 2014 5:34 pm
Location: los angeles

Re: why is the vocore's wifi speed so slow?

Thu Dec 11, 2014 4:20 am

hmm, i'm using iperf , couple of diff vocores too. i'm getting 70-92MB from inside the vovore out, but client to vocore wifi to wired, 4MB

>>>>>>>>>>>>>>>>> root@OpenWrt:~# iperf -c 192.168.1.166
>>>>>>>>>>>>>>>>> ------------------------------------------------------------
>>>>>>>>>>>>>>>>> Client connecting to 192.168.1.166, TCP port 5001
>>>>>>>>>>>>>>>>> TCP window size: 43.8 KByte (default)
>>>>>>>>>>>>>>>>> ------------------------------------------------------------
>>>>>>>>>>>>>>>>> [ 3] local 192.168.1.226 port 35648 connected with 192.168.1.166 port 5001
>>>>>>>>>>>>>>>>> [ ID] Interval Transfer Bandwidth
>>>>>>>>>>>>>>>>> [ 3] 0.0-10.0 sec 92.4 MBytes 77.4 Mbits/sec
>>>>>>>>>>>>>>>>> root@OpenWrt:~#

charliex
 
Posts: 42
Joined: Sun Nov 16, 2014 5:34 pm
Location: los angeles

Re: why is the vocore's wifi speed so slow?

Fri Jan 02, 2015 5:51 am

so anyone else done any testing? so far not even getting the 7MB peter is, speed is terrible

Greenwire-Elektronik
 
Posts: 101
Joined: Thu Dec 04, 2014 6:31 am

Re: why is the vocore's wifi speed so slow?

Fri Jan 02, 2015 11:39 am

charliex, just a thought after i have seen the wifi config of a random vocore - what might be the actual theoretical maximum? 5 GHz band is not supported, so Vocore stick with 2.4 GHz. VoCore seems to be configured to 11n:

Code: Select all
config wifi-device 'radio0'
        option type 'mac80211'
        option channel '11'
        option hwmode '11g'
        option path '10180000.wmac'
        option htmode 'HT20'
        option txpower '20'
        option country '00'


This means we only have a single 20 MHz channel on 2.4 GHz -> i am not quite sure whether we will get more than 54 Mbps - which would be something around 6.75 Mb/s. On the fly i cannot find any evidence for my theory, perhaps someone with more knowhow regarding those configuration settings can light up here. I do not know whether 11n introduces coding schemes which highers the throughput without rising the bandwidth. This would be an evidence against my theory.

In fact the whole configuration has to be checked - we found already a few mistakes in the defaults configuration.

Rgds

Jonas

PS: I found this, it might be worth changing to HT40 mode and retest (i would suggest to connect with LAN for fallback reasons if WLAN wouldn't work anymore).
Buy now - breakout board for VoCore to easy adapting your idea!

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Vonger
 
Posts: 762
Joined: Sun Oct 19, 2014 6:00 am

Re: why is the vocore's wifi speed so slow?

Fri Jan 02, 2015 1:48 pm

Hi,
I notice this recently. That might be driver issue.
Somebody test it by create more than one transfer process same time(for example, run 5 ftp same time), it is able get over 90Mbps and even reach its limit 150Mbps. I did not have a try, and I have no idea yet.(But I know, the secret is in the 802.11 config or driver!)
I did not notice this part when I develop it, due to my internet is only 8Mb, looks like it works well. :)

Vonger
 
Posts: 762
Joined: Sun Oct 19, 2014 6:00 am

Re: why is the vocore's wifi speed so slow?

Fri Jan 02, 2015 2:29 pm

VoCore works under AP+STA mode.
use mac as server, vocore as client, iperf

root@OpenWrt:/etc/config# iperf -c 192.168.61.159
iperf: invalid option -- ?
------------------------------------------------------------
Client connecting to 192.168.61.159, TCP port 5001
TCP window size: 43.8 KByte (default)
------------------------------------------------------------
[ 3] local 192.168.61.1 port 41728 connected with 192.168.61.159 port 5001
[ ID] Interval Transfer Bandwidth
[ 3] 0.0-10.1 sec 36.8 MBytes 30.6 Mbits/sec


use vocore as server, mac as client, iperf
root@OpenWrt:/etc/config# iperf -s
------------------------------------------------------------
Server listening on TCP port 5001
TCP window size: 85.3 KByte (default)
------------------------------------------------------------
[ 4] local 192.168.61.1 port 5001 connected with 192.168.61.159 port 50736
[ ID] Interval Transfer Bandwidth
[ 4] 0.0-10.7 sec 3.75 MBytes 2.94 Mbits/sec

This is weird :)

benty
 
Posts: 1
Joined: Sat Jan 10, 2015 7:30 am

Re: why is the vocore's wifi speed so slow?

Sat Jan 10, 2015 7:45 am

Hi all,The pyboard has arrived, so I quickly made a servo shield for it, and tested the servos first with the pyb.Servo and then directly with pyb.Timer. Both seem to be working fine.You can see that I had to make some adapters for the servo plugs. The pyboard uses 2.54 raster, and so does the servo breakout board, while the servo plugs and sockets have 1.27 raster.

I'm still waiting for VoCore to test it too. It's smaller, has 1.27 raster, runs actual Linux, includes WiFi and an USB host that I could use to connect a camera module from a laptop -- so overall, much more interesting to me. I can see that they got PWM to work on the GPIO pins, so it should be workable...


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