mirror of
https://github.com/wrolpi/wrolpi-help.git
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60 lines
2.6 KiB
Markdown
60 lines
2.6 KiB
Markdown
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# Speed Test
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The Speed Test measures the network between the device you are holding and your WROLPi. Use it to answer
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questions like "is the hotspot fast enough from the back porch?" or "how many people can watch videos at
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once?" without any third-party service. It works completely offline.
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> To open it, click **More** → **Calculators** → **Speed Test**, then click **Start test**.
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A run takes about 25 seconds:
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1. **Ping** – 20 quick round trips to the WROLPi. Reported as the median and best time, plus jitter (how much
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the time varies between pings).
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2. **Download** – the WROLPi streams random data to your browser for 10 seconds.
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3. **Upload** – your browser sends random data to the WROLPi for 10 seconds.
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Nothing is saved. Reload the page and the results are gone.
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## Reading the results
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* **Mbps** is megabits per second, the unit video bitrates are quoted in. **MB/s** (megabytes per second) is
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shown beside it; divide Mbps by 8 to get MB/s.
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* The download and upload figures are the **steady-state average**: the first second is ignored while the
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connection ramps up. The **peak** is the fastest quarter second.
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* **Ping** under 20 ms is excellent, under 60 ms is good. Over 150 ms on a local network usually means a weak
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WiFi signal.
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## Simultaneous video streams
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The table under the results divides your download speed by a typical bitrate for each video quality. It tells
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you roughly how many people could stream that quality at the same time over this link.
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| Quality | Typical bitrate |
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|---|---|
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| 480p (SD) | 2.5 Mbps |
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| 720p (HD) | 5 Mbps |
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| 1080p (Full HD) | 8 Mbps |
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| 1440p (2K) | 16 Mbps |
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| 2160p (4K) | 25 Mbps |
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Individual videos vary a lot; a screen recording needs far less than an action movie at the same resolution.
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The test measures the **network**. Videos are served from the WROLPi's drive, so a slow drive (or an SD card)
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can limit playback before the network does.
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## Hotspot or LAN?
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Under the results the page shows the address the WROLPi saw your device at. When your WROLPi's hotspot is on
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and your device has a hotspot address, it is marked **via WROLPi hotspot**. Otherwise it is marked **via LAN**.
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Run the test over the hotspot from different spots to find where the signal drops off, then compare with a
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wired or home-WiFi connection.
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## Several people at once
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There is no limit on how many devices can run the test at the same time. Have everyone press **Start test**
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together to see how the link shares between them; each device's results will note how many other tests were
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running during its own run.
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