Method
How each result was measured.
Rig
Both boxes are wired like this, behind the same hub on the same PC.
+-------------------------+
| PC: tests, usbmon |
+------------+------------+
|
+------------+------------+
| hub |
+---+--------+--------+---+
| | |
USB1 USB2 emulator
clone control control
| | |
+---+--------+---+ |
| box | |
+-------+--------+ |
| USB3 |
+-------+-------------+---+
| USB device emulator |
+-------------------------+| Item | Detail |
|---|---|
| Firmware | Stock V4.094, Medius 3.4.6 |
| Real device | A USB device emulator on each box's USB3, presenting the same device and native reports to both |
| Hub | One Genesys Logic hub for both boxes. One box was tested at a time. The other box's emulator presented a silent mouse |
| PC | Linux |
Rules
| Rule | Detail |
|---|---|
| Row | One condition, run on both boxes with the same test, settings, sample size and timing layer |
| Table | One quantity in one unit |
| Time | The median (p50), unless the table names another statistic |
| Range | Lowest to highest over the runs. The fainter part of a bar spans it |
| Bar | Drawn to the largest value in its table, or in its row on the Overview |
| Result | The box ahead, worked out from the values. The box behind is dimmed |
| Faithful | If a test records native behaviour, the box that matches it is ahead |
| Equal | The two ranges overlap, or the outcomes match |
| Differs | The boxes behave differently. Neither is better, or no test shows which is faithful |
| Defect | A fault that reproduces, marked on its row and listed on the Overview |
Timing layers
| Layer | Detail |
|---|---|
| Wire | USB packets on the PC's bus, timed by the kernel's usbmon |
| evdev | Input events, timed by the kernel as the HID driver handles each report |
| hidraw | Each report byte for byte, timed when the reading program wakes |
| Host | The PC's clock, read by the test program when it writes a command, or when the clone connects or disconnects |
| Emulator | When the emulator queued each native report, on its clock, mapped to the bus clock to within ±95 µs by its control link's packets (usbmon) |
Data
The results as JSON, all in one file or split by area.
| File | Area |
|---|---|
| comparison.json | All |
| devices.json | Devices |
| passthrough.json | Passthrough |
| injection.json | Injected motion |
| control-link.json | Control link |
| input.json | Buttons, keys and locks |
| recovery.json | Recovery |
| features.json | Features |
| software.json | Software |