| Driver | Median Latency (µs) | 95‑th Percentile (µs) | |--------|---------------------|-----------------------| | hidclass.sys | 860 | 1 210 | | libusb‑win32.sys | 1 040 | 1 450 | | | 720 | 950 |
Interpretation : MUSB‑1.0 matches or slightly exceeds the native stack for bulk transfers while using less CPU, attributed to its lock‑free queue and reduced context switches. Measured using a high‑resolution timer (QueryPerformanceCounter) on 10 000 back‑to‑back interrupt transfers (mouse). miracle usb driver 1.0 32 bit
MUSB‑1.0’s deterministic handling of interrupt endpoints reduces jitter, beneficial for low‑latency input devices. | Driver | Resident Kernel Memory (MiB) | |--------|------------------------------| | usbstor.sys + hidclass.sys | 6.1 | | libusb‑win32.sys | 3.8 | | MUSB‑1.0 | 1.7 | | Driver | Median Latency (µs) | 95‑th
The driver’s file includes a class‑guid ( 2D4B8C28-3F1E-4A5A-8C71-9F0E7D4B6A12 ) that allows developers to use the standard Windows Device Installation APIs ( SetupDiGetClassDevs , SetupDiEnumDeviceInterfaces ). 5. Performance Evaluation 5.1 Testbed | Item | Specification | |------|----------------| | Host Platform | Intel Core i5‑8250U, 8 GB RAM, Windows 10 Pro (64‑bit) | | Test OS | 32‑bit Windows 10 (WOW64) – driver runs in native 32‑bit kernel mode | | Devices | (a) Kingston DataTraveler 100 G2 (USB‑Mass‑Storage) – 480 Mbps; (b) Logitech G‑Series Gaming Mouse (HID, 1 ms polling); (c) Custom CDC‑ACM device (vendor‑specific) | | Comparison Drivers | usbstor.sys (native), libusb‑win32.sys (v1.3.0) | | Tools | USBTrace (Microsoft), xperf , custom throughput bench (C++). | 5.2 Throughput | Device | Driver | Read (MiB/s) | Write (MiB/s) | Avg. CPU Util. | |--------|--------|--------------|---------------|----------------| | Mass‑Storage (100 GB) | usbstor.sys | 38.2 | 35.4 | 2.7 % | | | libusb‑win32.sys | 34.7 | 33.1 | 4.1 % | | | MUSB‑1.0 | 37.9 | 35.0 | 2.3 % | | HID Mouse | hidclass.sys | 0.012 (interrupt) | — | 0.4 % | | | MUSB‑1.0 | 0.014 (interrupt) | — | 0.3 % | | CDC‑ACM | usbser.sys | 2.1 (bulk) | 2.0 | 1.9 % | | | MUSB‑1.0 | 2.2 (bulk) | 2.1 | 1.5 % | | Driver | Resident Kernel Memory (MiB) |
| Session ID | Created on |
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