Wireless Access

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BBF
Occasional Contributor II
Posts: 12
Registered: ‎06-16-2016

Low throughput on IAP-215

I'm seeing lower than expected throughtput with a controllerless setup with three IAP-215's. If I disconnect all but a single IAP-215, in close proximity with a MacBook Pro the link speed reported in mac OS is 1170mbps (MCSIndex : 9) and 802.11ac. Testing throughtput with Helios LanTest to an ethernet connected NAS shows near symetrical up/down throughput of around 13MB/s (+ or - 2MB/s). Connected via ethernet instead to the same PoE switch gives a throughput of 60MB/s.

If 13MB/s is around 104mbps, this appears to be 10x difference between the link speed and actual throughput. I this normal? I was expecting more like +40Mb/s

The IAP is on firmware 6.4.4.4-4.2.3.2_54910 with a vanilla setup and no bandwidth limits set.

Guru Elite
Posts: 21,017
Registered: ‎03-29-2007

Re: Low throughput on IAP-215

On the SSID enable broadcast filter ARP in advanced.


Colin Joseph
Aruba Customer Engineering

Looking for an Answer? Search the Community Knowledge Base Here: Community Knowledge Base

BBF
Occasional Contributor II
Posts: 12
Registered: ‎06-16-2016

Re: Low throughput on IAP-215

Hi,

 

Thanks for your reply. Originally it was on 'none', then I tried 'all' (no change), then 'arp' (still no change).

 

Should I be seeing higher throughput than 13MB/s ?

Guru Elite
Posts: 21,017
Registered: ‎03-29-2007

Re: Low throughput on IAP-215

I hinestly don't know anything about the Helios LAN test. How .any SSIDs are you broadcasting?

Mimo also needs an obstacle between the AP and the client for increased throughput. You also might want to have your client a minimum of 4 meters from your access point to prevent distortion that would interfere with throughput.


Colin Joseph
Aruba Customer Engineering

Looking for an Answer? Search the Community Knowledge Base Here: Community Knowledge Base

BBF
Occasional Contributor II
Posts: 12
Registered: ‎06-16-2016

Re: Low throughput on IAP-215

[ Edited ]
Hi,

SSID's - just two. This is a just a domestic application. Helios was just the first mac tool i could find. Do you know of a better tool?

If MacOS is reporting link speed and MCS index 9 wouldn't that already indicate that the physical properties, objects etc, are good i.e. If there was interference or multipath issues wouldnt affect that status?

MCS index of 9 @ 1170 correlates to the last row in the chart, in the 80mhz column, indicating 3 spatial streams.

http://www.wlanpros.com/mcs-index-802-11n-802-11ac-chart-3/

I'll try repositioning a few times and see what happens.
Guru Elite
Posts: 21,017
Registered: ‎03-29-2007

Re: Low throughput on IAP-215

Try disabling the second SSID, if you can, because it does add overhead.  The "rate" is the negotiated rate, and it does not say anything realtime about throughput, aggregation inefficiency or the RF performance of any of the individual channels.  You never, ever get the speed or even half the speed of the negotiated rate, due to wireless being shared and half duplex.  There is also much more overhead involved in wireless that can decrease the rate, including your distance to the receiver and the Mimo effect.



Colin Joseph
Aruba Customer Engineering

Looking for an Answer? Search the Community Knowledge Base Here: Community Knowledge Base

BBF
Occasional Contributor II
Posts: 12
Registered: ‎06-16-2016

Re: Low throughput on IAP-215

[ Edited ]

Moving to a different location further away and, just to check it wasn't specific to that AP I used a different AP, the link speed dropped to 878mbps. Ran Helios tests which gave 13MB/s (104mbps) up and 2.3MB/s (18.4mbps) down. I've combined the data into one image below, including the AP's own quoted throughput. Afterwards I disconnected the AP and plugged the same MacBook into the same ethernet cable, and got 60MB/s (480mbps), which is perhaps limited by the NAS itself.

Here's a thread were people are seeing 40+ MB/s on consumer grade AP's. http://www.snbforums.com/threads/wifi-ac-real-life-speeds.23281/

 

 Screen Shot 2016-11-13 at 15.41.png

 

Over ethernet:

 

Screen Shot 2016-11-13 at 15.54.31.png

 

BBF
Occasional Contributor II
Posts: 12
Registered: ‎06-16-2016

Re: Low throughput on IAP-215

Is this really normal to have such a poor throughput on current hardware? This is crazy...

MVP
Posts: 1,310
Registered: ‎11-07-2008

Re: Low throughput on IAP-215

It's impossible to know if it's something on the wire or environment or what. It would be far better to connect up the IAP in stand alone off a gig switch, not connected anywhere else on your network, and stand up a WPA2-PSK SSID, configure a laptop on the wired side of the switch, and run iPerf or some other simple packet analysis tool from the wireless client to the wired, taking all the rest of the network out of the equation.

 

This is not normal and in our own testing and others with clients, they are getting far far more than that, so there's likely some other factor causing the issue. 

Jerrod Howard
Sr. Techical Marketing Engineer
MVP
Posts: 1,310
Registered: ‎11-07-2008

Re: Low throughput on IAP-215

I'm also still not clear what the test endpoints are doing. Are you just moving a large file (since you mention a LAN attached NAS server)?

 

have you tried standing up a wired IPerf server on your wire and putting iPerf on the wireless client and testing that way? File protocol plays a huge part in speeds, and for me, moving files on a MAC to an SMB-based NAS is incredibly slow, but doing iPerf or Ixia tests is near PHY rate based on SNR and MCS rate.

Jerrod Howard
Sr. Techical Marketing Engineer
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