Iperf on the Router/AP CPU sources and sinks traffic. The Router/AP hardware acceleration forwards traffic. These can be very different logic subsystems.

One can sometimes connect a computer to the wired LAN port and measure traffic between WiFi and the wired LAN port to get forwarding performance.

Also, the iperf 2 bounceback feature, using low duty cycle traffic, may be sufficient to give WiFi responsiveness metrics even with the Router CPU sourcing and sinking the traffic.  Your mileage will vary applies.

Bob

On Thu, Oct 20, 2022 at 8:57 AM Sebastian Moeller via Make-wifi-fast <make-wifi-fast@lists.bufferbloat.net> wrote:
Hi Jeremy,

On 20 October 2022 16:50:43 CEST, Jeremy Harris via Make-wifi-fast <make-wifi-fast@lists.bufferbloat.net> wrote:
>On 20/10/2022 10:01, Sebastian Moeller via Make-wifi-fast wrote:
>> [SM] IIRC some router SoC allow higher routing throughput than they can sink or source bulk traffic with iperf. This is especially pronounced in routers that use soft- and especially hardware acceleration
>
>Why do you think that iperf traffic will not be accelerated?

[SM] Because for sending and receiving data in the iperf application the CPU has to handle the traffic, while accelerator mainly work by having the CPU touch the data as little as possible/not at all.

Regards
        Sebastian

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