Dotaz: USB 3.0

[Martin]

Můžete mi, prosím, v rychlosti poradit, jak poznám, že USB disk jede na verzi USB 3.0? Mám Debian a desku Asrock, která USB 3.0 má, ale rychlost kopírování je někde do 25MB/s.

[  154.732463] usb 1-1.3: USB disconnect, device number 4
[  163.639885] usb 2-1.3: new SuperSpeed USB device number 3 using xhci_hcd
[  163.656337] usb 2-1.3: New USB device found, idVendor=1058, idProduct=10b8
[  163.656344] usb 2-1.3: New USB device strings: Mfr=1, Product=2, SerialNumber=5
[  163.656347] usb 2-1.3: Product: Elements 10B8
[  163.656350] usb 2-1.3: Manufacturer: Western Digital
[  163.656353] usb 2-1.3: SerialNumber: 5487846315645646421515554
[  163.657062] usb-storage 2-1.3:1.0: USB Mass Storage device detected
[  163.658221] scsi3 : usb-storage 2-1.3:1.0
[  164.657811] scsi 3:0:0:0: Direct-Access     WD       Elements 10B8    1012 PQ: 0 ANSI: 6
[  164.658700] sd 3:0:0:0: Attached scsi generic sg2 type 0
[  164.659200] sd 3:0:0:0: [sdc] Spinning up disk...
[  165.663400] ......ready
[  170.701579] sd 3:0:0:0: [sdc] 1465081718 512-byte logical blocks: (750 GB/698 GiB)
[  170.701816] sd 3:0:0:0: [sdc] Write Protect is off
[  170.701821] sd 3:0:0:0: [sdc] Mode Sense: 47 00 10 08
[  170.702060] sd 3:0:0:0: [sdc] No Caching mode page found
[  170.706230] sd 3:0:0:0: [sdc] Assuming drive cache: write through
[  170.764019]  sdc: sdc1
[  170.765092] sd 3:0:0:0: [sdc] Attached SCSI disk

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Odpovědi

[mimi.vx]

using xhci_hcd znamena USB3 radic.
OHCI a EHCI jsou USB2.

[Michal Kubeček]

OHCI a UHCI jsou jen pro USB 1.x, na USB 2.0 potřebujete EHCI (nebo XHCI).

[alkoholik]

Pravda, nejak se mi to prehodilo. Jak rika wiki:
The OHCI and UHCI controllers support only USB 1 speed devices (1.5 Mbit/s and 12 Mbit/s), and the EHCI only supports USB 2 devices (480 Mbit/s).
The xHCI architecture was designed to support all USB speeds, including SuperSpeed (5 Gbit/s) and future speeds, under a single driver stack.

[Jack]

Ale kdyz do kernelu zakompiluju jen XHCI, tak to se pouzije i kdyz bude zarizeni jen USB 1 nebo 2, ne?

[Michal Kubeček]

AFAIK jen pokud řadič, na který ho připojíte, bude podporovat XHCI (tj. USB 3.0).

[vagojan]

lsusb -t ti vypíše rychlost připojených zařízení.

[vagojan]

[ 163.639885] usb 2-1.3: new SuperSpeed USB device number 3 using xhci_hcd

SuperSpeed je USB3

[Martin]

Díky za vysvětlení;)