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searchwing-pi-datarate [2020/01/08 21:38] beckmanf [http transfer time for wifi] rate computed |
searchwing-pi-datarate [2020/01/08 22:00] beckmanf [Results] |
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* Placement: Pi Zero and Laptop placed 10cm above router. | * Placement: Pi Zero and Laptop placed 10cm above router. | ||
* data ammount: 540 MByte | * data ammount: 540 MByte | ||
+ | * ** Laptop and Raspberry Pi share the same Wifi channel => Each packet goes from Pi to AP and from AP to Laptop. => Congestion on the Wifi Channel. ** | ||
=== wget === | === wget === | ||
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==== Results ==== | ==== Results ==== | ||
+ | * The Laptop and the Pi should not be connected via a single 2.4 GHz access point as laptop and Pi share the same Wifi channel. This results in 50% throughput reduction (see Julians 2.5 MB/s for wget). | ||
+ | * The transfer rate via wget on an undisturbed 2.4 GHz wifi channel is **5 MB/s**. (Only Pi connected to AP, No other stations use this channel). This 40 MBit/s throughput on http level compares well to the maximum 65 MBit/s wifi data rate of the Pi Zero W. | ||
+ | * ssh transfer is limited by CPU load on the Pi for encryption and results in 1.8 MB/s for Wifi. | ||
+ | * Short Guard Interval setting could possibly increase the the raw wifi rate from 65 MBit/s to 72 MBit/s. | ||