Pregunta USB3 lento bajo Linux


Tengo un problema con la velocidad de USB 3.0 en Linux. Estoy probando con las siguientes partes:

  • "NEC Corporation uPD720200 USB 3.0 Host Controller" (pcie)
  • Lector de tarjetas USB 3.0 "Pretec 240"
  • Sandisk Extreme Compact Flash 60 MB / s

En Windows 7, "HD-Tune Pro" informa una velocidad de lectura de 60-70 MB / s, pero en Linux "hdparm -t" / "dd if = / dev / sdX of = / dev / null" informan solo alrededor de 25-30 MB / s.

uname -a

Linux workstation 3.1-0.slh.2-aptosid-amd64 #1 SMP PREEMPT Tue Oct 25 01:47:47 UTC 2011 x86_64 GNU/Linu

/ var / log / syslog cuando se conecta el lector de tarjetas:

Nov  3 19:20:33 localhost kernel: [ 1973.293522] usb 4-1: new SuperSpeed USB device number 10 using xhci_hcd
Nov  3 19:20:33 localhost kernel: [ 1973.314354] xhci_hcd 0000:06:00.0: WARN: short transfer on control ep
Nov  3 19:20:33 localhost kernel: [ 1973.346584] xhci_hcd 0000:06:00.0: WARN: short transfer on control ep
Nov  3 19:20:33 localhost kernel: [ 1973.375744] xhci_hcd 0000:06:00.0: WARN: short transfer on control ep
Nov  3 19:20:33 localhost kernel: [ 1973.404950] xhci_hcd 0000:06:00.0: WARN: short transfer on control ep
Nov  3 19:20:33 localhost kernel: [ 1973.405189] usb 4-1: New USB device found, idVendor=0bda, idProduct=0301
Nov  3 19:20:33 localhost kernel: [ 1973.405195] usb 4-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
Nov  3 19:20:33 localhost kernel: [ 1973.405199] usb 4-1: Product: USB3.0 Card Reader
Nov  3 19:20:33 localhost kernel: [ 1973.405202] usb 4-1: Manufacturer: Realtek
Nov  3 19:20:33 localhost kernel: [ 1973.405206] usb 4-1: SerialNumber: 201006010301
Nov  3 19:20:33 localhost mtp-probe: checking bus 4, device 10: "/sys/devices/pci0000:00/0000:00:1c.4/0000:06:00.0/usb4/4-1"
Nov  3 19:20:33 localhost kernel: [ 1973.408167] xhci_hcd 0000:06:00.0: WARN: short transfer on control ep
Nov  3 19:20:33 localhost kernel: [ 1973.411443] xhci_hcd 0000:06:00.0: WARN: short transfer on control ep
Nov  3 19:20:33 localhost kernel: [ 1973.412056] scsi15 : usb-storage 4-1:1.0
Nov  3 19:20:34 localhost mtp-probe: bus: 4, device: 10 was not an MTP device
Nov  3 19:20:35 localhost kernel: [ 1974.429746] scsi 15:0:0:0: Direct-Access     Generic- USB3.0 CRW-CF/MD 1.00 PQ: 0 ANSI: 0 CCS
Nov  3 19:20:35 localhost kernel: [ 1974.445740] scsi 15:0:0:1: Direct-Access     Generic- USB3.0 CRW-SM/xD 1.00 PQ: 0 ANSI: 0 CCS
Nov  3 19:20:35 localhost kernel: [ 1974.462208] scsi 15:0:0:2: Direct-Access     Generic- USB3.0 CRW-SD    1.00 PQ: 0 ANSI: 0 CCS
Nov  3 19:20:35 localhost kernel: [ 1974.478117] scsi 15:0:0:3: Direct-Access     Generic- USB3.0 CRW-MS    1.00 PQ: 0 ANSI: 0 CCS
Nov  3 19:20:35 localhost kernel: [ 1974.494461] scsi 15:0:0:4: Direct-Access     Generic- USB3.0 CRW-SD/MS 1.00 PQ: 0 ANSI: 0 CCS
Nov  3 19:20:35 localhost kernel: [ 1974.495905] sd 15:0:0:0: Attached scsi generic sg3 type 0
Nov  3 19:20:35 localhost kernel: [ 1974.496225] sd 15:0:0:1: Attached scsi generic sg4 type 0
Nov  3 19:20:35 localhost kernel: [ 1974.497412] sd 15:0:0:2: Attached scsi generic sg5 type 0
Nov  3 19:20:35 localhost kernel: [ 1974.497732] sd 15:0:0:3: Attached scsi generic sg6 type 0
Nov  3 19:20:35 localhost kernel: [ 1974.497972] sd 15:0:0:4: Attached scsi generic sg7 type 0
Nov  3 19:20:35 localhost kernel: [ 1975.165150] sd 15:0:0:1: [sde] Attached SCSI removable disk
Nov  3 19:20:35 localhost kernel: [ 1975.168154] sd 15:0:0:0: [sdd] 15625216 512-byte logical blocks: (8.00 GB/7.45 GiB)
Nov  3 19:20:35 localhost kernel: [ 1975.170400] sd 15:0:0:0: [sdd] Write Protect is off
Nov  3 19:20:35 localhost kernel: [ 1975.170406] sd 15:0:0:0: [sdd] Mode Sense: 03 00 00 00
Nov  3 19:20:35 localhost kernel: [ 1975.172895] sd 15:0:0:4: [sdh] Attached SCSI removable disk
Nov  3 19:20:35 localhost kernel: [ 1975.173277] sd 15:0:0:0: [sdd] No Caching mode page present
Nov  3 19:20:35 localhost kernel: [ 1975.173283] sd 15:0:0:0: [sdd] Assuming drive cache: write through
Nov  3 19:20:35 localhost kernel: [ 1975.174211] sd 15:0:0:2: [sdf] Attached SCSI removable disk
Nov  3 19:20:35 localhost kernel: [ 1975.175141] sd 15:0:0:3: [sdg] Attached SCSI removable disk
Nov  3 19:20:35 localhost kernel: [ 1975.183265] sd 15:0:0:0: [sdd] No Caching mode page present
Nov  3 19:20:35 localhost kernel: [ 1975.183271] sd 15:0:0:0: [sdd] Assuming drive cache: write through
Nov  3 19:20:35 localhost kernel: [ 1975.211534]  sdd: sdd1
Nov  3 19:20:35 localhost kernel: [ 1975.219096] sd 15:0:0:0: [sdd] No Caching mode page present
Nov  3 19:20:35 localhost kernel: [ 1975.219101] sd 15:0:0:0: [sdd] Assuming drive cache: write through
Nov  3 19:20:35 localhost kernel: [ 1975.219106] sd 15:0:0:0: [sdd] Attached SCSI removable disk

lsusb -v:

Bus 004 Device 010: ID 0bda:0301 Realtek Semiconductor Corp. 
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               3.00
  bDeviceClass            0 (Defined at Interface level)
  bDeviceSubClass         0 
  bDeviceProtocol         0 
  bMaxPacketSize0         9
  idVendor           0x0bda Realtek Semiconductor Corp.
  idProduct          0x0301 
  bcdDevice            1.20
  iManufacturer           1 Realtek
  iProduct                2 USB3.0 Card Reader
  iSerial                 3 201006010301
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength           44
    bNumInterfaces          1
    bConfigurationValue     1
    iConfiguration          4 CARD READER
    bmAttributes         0x80
      (Bus Powered)
    MaxPower              200mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           2
      bInterfaceClass         8 Mass Storage
      bInterfaceSubClass      6 SCSI
      bInterfaceProtocol     80 Bulk (Zip)
      iInterface              5 Bulk-In, Bulk-Out, Interface
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x01  EP 1 OUT
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0400  1x 1024 bytes
        bInterval               0
        bMaxBurst               3
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x82  EP 2 IN
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0400  1x 1024 bytes
        bInterval               0
        bMaxBurst               3
Binary Object Store Descriptor:
  bLength                 5
  bDescriptorType        15
  wTotalLength           22
  bNumDeviceCaps          2
  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
      Latency Tolerance Messages (LTM) Supported
    wSpeedsSupported   0x000e
      Device can operate at Full Speed (12Mbps)
      Device can operate at High Speed (480Mbps)
      Device can operate at SuperSpeed (5Gbps)
    bFunctionalitySupport   0
      Lowest fully-functional device speed is Low Speed (1Mbps)
    bU1DevExitLat           1 micro seconds
    bU2DevExitLat        2815 micro seconds
Device Status:     0x0000
  (Bus Powered)

2


origen




Respuestas:


Parece que Linux y el lector de tarjetas no se quieren.

Hoy compruebo un adaptador USB3 a SATA y la velocidad del disco duro probado fue aproximadamente la misma que con SATA directamente.


0



El nuevo lector de tarjetas USB3 con diferente controlador funciona con la velocidad usb3. Es un "Transcend F8" con un controlador "Genesys Logic GL3220" en lugar del "Realtek RTS5301" en el "Pretec 240" - rmweiss