linux 测试usb带宽

• usb 2.0
  480Mbps 即 60MB/s
• usb 3.0
  5Gbps

root@NanoPi-M4v2:~# lsusb
Bus 006 Device 007: ID 2e03:0001
Bus 006 Device 006: ID 2109:0817 VIA Labs, Inc.
Bus 006 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 005 Device 043: ID 046d:c077 Logitech, Inc. M105 Optical Mouse
Bus 005 Device 042: ID c0f4:01e0
Bus 005 Device 041: ID 2109:2817 VIA Labs, Inc.
Bus 005 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

• 3.0 表示有 usb 3.0

root@NanoPi-M4v2:~# lsusb -tv
/:  Bus 06.Port 1: Dev 1, Class=root_hub, Driver=xhci-hcd/1p, 5000M
    |__ Port 1: Dev 6, If 0, Class=Hub, Driver=hub/4p, 5000M
        |__ Port 4: Dev 7, If 0, Class=Miscellaneous Device, Driver=, 5000M
        |__ Port 4: Dev 7, If 1, Class=Miscellaneous Device, Driver=, 5000M
        |__ Port 4: Dev 7, If 2, Class=Miscellaneous Device, Driver=, 5000M
/:  Bus 05.Port 1: Dev 1, Class=root_hub, Driver=xhci-hcd/1p, 480M
    |__ Port 1: Dev 41, If 0, Class=Hub, Driver=hub/4p, 480M
        |__ Port 2: Dev 42, If 0, Class=Human Interface Device, Driver=usbhid, 1.5M
        |__ Port 2: Dev 42, If 1, Class=Human Interface Device, Driver=usbhid, 1.5M
        |__ Port 3: Dev 43, If 0, Class=Human Interface Device, Driver=usbhid, 1.5M
/:  Bus 04.Port 1: Dev 1, Class=root_hub, Driver=ohci-platform/1p, 12M
/:  Bus 03.Port 1: Dev 1, Class=root_hub, Driver=ehci-platform/1p, 480M
/:  Bus 02.Port 1: Dev 1, Class=root_hub, Driver=ohci-platform/1p, 12M
/:  Bus 01.Port 1: Dev 1, Class=root_hub, Driver=ehci-platform/1p, 480M

• 12M 意味着 USB 1.0 / 1.1的速率是 12Mbit/s
• 480M 意味着 USB 2.0的速率是 480Mbit/s

# 切到u盘目录
cd /media/pi/ZHOUQINAN  
# 测试写入
dd if=/dev/zero of=./largefile bs=8k count=10
# 测试读取  
sudo sh -c "sync && echo 3 > /proc/sys/vm/drop_caches"     
dd if=./largefile of=/dev/null bs=8k