WAX214 maximum real world throughput issue

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schumaku wrote:

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t0mb0 wrote:

I've just installed a WAX214 access point.  The maximum throughput I can achieve using 5Ghz Wifi 6 with 80Mhz channels is about 540Mbps.  ... I've tried an iPad, an iPhone and an M1 Macbook, all a negligible distance from the AP, which are all full Wifi 6 devices and they all cap out at close to 540Mbps.

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Ok, instead of digging in the dark - what does the Macbook WiFi diagnostics show for the M1 connection?

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Thanks for the reply.  The relevant settings are:

Channel: 40 (5 GHz, 80 MHz)

Country code: GB

RSSI: -40 dBm

Noise: -90 dBm

Tx Rate: 1,200 Mbps

PHY Mode: 802.11ax

MCS Index: 11

NSS: 2

I have done more tests however, and the situation is now rather stranger.  I've run some iperf3 tests, and I can achieve 850ish Mbps, which is more what I'd expect, so the raw throughput of the WAX214 appears ok.  

However, when running a variety of internet speed tests, these cap out at 540 Mbps through the WAX214.  The normal conclusion would be that the bottleneck is therefore my internet connection, rather than the wireless throughput.  However, the computer which is wired in to the same switch as the WAX214, can reliably achieve a full 1000Mbps on the same internet speed tests.  This is the very same computer which I used as an endpoint to the iperf3 throughput tests. 

Is there any reason that the max throughput of the WAX214 should be significantly lower for an internet speedtest than for an iperf3 (default settings) test if (as I believe we have proved) internet speed itself is not to be the bottleneck?  Alternatively, could there be some subtle interaction between the WAX214 and the internet router/modem, for example, which would limit the throughput?