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USB3 和 USB2 通过 SATA 的实际速度（流量、延迟）是多少？

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USB3 和 USB2 通过 SATA 的实际速度（流量、延迟）是多少？

USB3 和 USB2 通过 SATA 的实际速度（流量、延迟）是多少？

很容易找到流媒体速度比较，但在相同设置中找到延迟比较则比较困难。

稍后回答。

答案1

在配备英特尔 i7-4770K、大量内存和 ubuntu 14.10 的华硕 Z87 主板上，使用 ext4 文件系统上的 ioping 实用程序对第​​一代英特尔 80gb SSD 驱动器（X25-M）进行粗略的性能比较，以下是读取性能的粗略估计：

SPEC:  250MB/sec, 
SATA:  240MB/sec, 1000 iops, 1ms latency
USB3:  190MB/sec, 750 iops, 1.3ms latency
USB2:  43MB/sec, 200 iops, 6ms latency

当然，对于不同的设置，情况会有所不同。此表的目的是在非理论比较中添加一些延迟和 iops 统计数据。下面的其余内容仅仅是上述内容的详细信息。

更多详情请关注

All Tests Run On An Intel 80GB First-Gen Drive, X25-M.
Direct-Access     ATA      INTEL SSDSA2M080 02HA PQ: 0 ANSI: 5

Intel Posted X25-M Drive Specs:

Read: 250MB/s
Write: 70MB/s
Latency Read: 65us
Latency Write 85us
IOPS: read=35k.  write=300 to 6600

Motherboard: Asus Z87 Gryphon w/ USB 3.0 port.

----------------------------------------------------------------

on the SATA bus:

# ioping -RL .
--- . (ext4 /dev/sdb1) ioping statistics ---
2.8 k requests completed in 3.0 s, 952 iops, 238.0 MiB/s
min/avg/max/mdev = 999 us / 1.1 ms / 2.1 ms / (85 us)

# ioping -RL .
--- . (ext4 /dev/sdb1) ioping statistics ---
2.8 k requests completed in 3.0 s, 956 iops, 239.2 MiB/s
min/avg/max/mdev = 1.0 ms / 1.0 ms / 7.6 ms / (149 us)


----------------------------------------------------------------

on the USB 3.0 superspeed bus:

Bus 003 Device 011: ID 152d:2509 JMicron Technology Corp. / JMicron USA Technology Corp. JMS539 SuperSpeed SATA II 3.0G Bridge


# ioping -R .
--- . (ext4 /dev/sdd1) ioping statistics ---
11.3 k requests completed in 3.0 s, 3.8 k iops, 14.8 MiB/s
min/avg/max/mdev = 247 us / 264 us / 4.6 ms / (49 us)

# ioping .
4.0 KiB from . (ext4 /dev/sdd1): request=1 time=1.6 ms
4.0 KiB from . (ext4 /dev/sdd1): request=2 time=333 us
... ^C
--- . (ext4 /dev/sdd1) ioping statistics ---
12 requests completed in 11.5 s, 2.3 k iops, 9.1 MiB/s
min/avg/max/mdev = 290 us / 427 us / 1.6 ms / (344 us)

# ioping -RL .
--- . (ext4 /dev/sdd1) ioping statistics ---
2.2 k requests completed in 3.0 s, 748 iops, 187.0 MiB/s
min/avg/max/mdev = 1.3 ms / 1.3 ms / 3.6 ms / (96 us)

----------------------------------------------------------------

on the USB 2.0 high-speed bus:

# ioping -R .
--- . (ext4 /dev/sdd1) ioping statistics ---
509 requests completed in 3.0 s, 170 iops, 42.6 MiB/s
min/avg/max/mdev = 5.8 ms / 5.9 ms / 6.3 ms / (67 us)

# ioping -RL .
--- . (ext4 /dev/sdd1) ioping statistics ---
510 requests completed in 3.0 s, 170 iops, 42.7 MiB/s
min/avg/max/mdev = 5.8 ms / 5.9 ms / 6.3 ms / (42 us)


----------------------------------------------------------------

USB3 Bridge Device

Bus 003 Device 011: ID 152d:2509 JMicron Technology Corp. / JMicron USA Technology Corp. JMS539 SuperSpeed SATA II 3.0G Bridge
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               2.10
  bDeviceClass            0 (Defined at Interface level)
  bDeviceSubClass         0 
  bDeviceProtocol         0 
  bMaxPacketSize0        64
  idVendor           0x152d JMicron Technology Corp. / JMicron USA Technology Corp.
  idProduct          0x2509 JMS539 SuperSpeed SATA II 3.0G Bridge
  bcdDevice            1.00
  iManufacturer           1 JMicron
  iProduct               11 Usb production
  iSerial                 3 00A123456A8D
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength           32
    bNumInterfaces          1
    bConfigurationValue     1
    iConfiguration          4 USB Mass Storage
    bmAttributes         0xc0
      Self Powered
    MaxPower                2mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           2
      bInterfaceClass         8 Mass Storage
      bInterfaceSubClass      6 SCSI
      bInterfaceProtocol     80 Bulk-Only
      iInterface              6 MSC Bulk-Only Transfer
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0200  1x 512 bytes
        bInterval               0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x02  EP 2 OUT
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0200  1x 512 bytes
        bInterval               0
Binary Object Store Descriptor:
  bLength                 5
  bDescriptorType        15
  wTotalLength           42
  bNumDeviceCaps          3
  USB 2.0 Extension Device Capability:
    bLength                 7
    bDescriptorType        16
    bDevCapabilityType      2
    bmAttributes   0x00000002
      Link Power Management (LPM) Supported
  SuperSpeed USB Device Capability:
    bLength                10
    bDescriptorType        16
    bDevCapabilityType      3
    bmAttributes         0x00
    wSpeedsSupported   0x000e
      Device can operate at Full Speed (12Mbps)
      Device can operate at High Speed (480Mbps)
      Device can operate at SuperSpeed (5Gbps)
    bFunctionalitySupport   1
      Lowest fully-functional device speed is Full Speed (12Mbps)
    bU1DevExitLat          10 micro seconds
    bU2DevExitLat          32 micro seconds
  Container ID Device Capability:
    bLength                20
    bDescriptorType        16
    bDevCapabilityType      4
    bReserved               0
    ContainerID             {00010203-0405-0607-0800-000000000000}
Device Status:     0x0001
  Self Powered

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