Re: da usb 1.1 a usb 2.0
Domenico Ferraro ha scritto:
Il giorno ven, 20/02/2009 alle 20.16 +0100, DonnieDarko ha scritto:
[45528.499125] usb 5-1: new high speed USB device using ehci_hcd and
address 2
[45528.632655] usb 5-1: configuration #1 chosen from 1 choice
quanto dovrebbe essere più o meno la velocità di trasferimento corretta
per un usb2 a piena velocità?
- "High Speed" 480 Mbit/sec (60 MByte/sec)
- "Full Speed" 12 Mbit/sec (1.5 MByte/sec)
- "Low Speed" 1.5 Mbit/sec
tratto da /usr/src/linux-source-2.6.26/Documentation/usb/ehci.txt
Ciao Mimmo
Ok, ma quelle sono le velocità massime dichiarate, la vera velocità
dipende molto dal dispositivo collegato...
le usb2 ce l'ho soltanto su scheda pci, quindi non so se i valori di
trasferimento che mi ritrovo con i miei dispositivi, sono il massimo
"fisico" degli stessi o sono limitati dalla scheda pci che non funziona
a dovere...
ora ho collegato alla scheda pci una pennina usb e una compact flash
attraverso un card reader
--------------
lsusb -v
Bus 005 Device 003: ID 04e8:0110 Samsung Electronics Co., Ltd Connect3D
Flash Drive
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.00
bDeviceClass 0 (Defined at Interface level)
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 64
idVendor 0x04e8 Samsung Electronics Co., Ltd
idProduct 0x0110 Connect3D Flash Drive
bcdDevice 0.50
iManufacturer 1
iProduct 2 USB DRIVE
iSerial 3 61460F0004CD
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 32
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 0
bmAttributes 0x80
(Bus Powered)
MaxPower 500mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 2
bInterfaceClass 8 Mass Storage
bInterfaceSubClass 6 SCSI
bInterfaceProtocol 80 Bulk (Zip)
iInterface 0
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
Device Qualifier (for other device speed):
bLength 10
bDescriptorType 6
bcdUSB 2.00
bDeviceClass 0 (Defined at Interface level)
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 64
bNumConfigurations 1
Device Status: 0x0000
(Bus Powered)
Bus 005 Device 002: ID 05e3:0703 Genesys Logic, Inc. Card Reader
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.00
bDeviceClass 0 (Defined at Interface level)
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 64
idVendor 0x05e3 Genesys Logic, Inc.
idProduct 0x0703 Card Reader
bcdDevice 1.01
iManufacturer 0
iProduct 1 USB TO IDE
iSerial 0
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 32
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 0
bmAttributes 0x80
(Bus Powered)
MaxPower 500mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 2
bInterfaceClass 8 Mass Storage
bInterfaceSubClass 6 SCSI
bInterfaceProtocol 80 Bulk (Zip)
iInterface 0
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
Device Qualifier (for other device speed):
bLength 10
bDescriptorType 6
bcdUSB 2.00
bDeviceClass 0 (Defined at Interface level)
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 64
bNumConfigurations 1
Device Status: 0x0000
(Bus Powered)
Bus 005 Device 001: ID 0000:0000
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.00
bDeviceClass 9 Hub
bDeviceSubClass 0 Unused
bDeviceProtocol 1 Single TT
bMaxPacketSize0 64
idVendor 0x0000
idProduct 0x0000
bcdDevice 2.06
iManufacturer 3 Linux 2.6.24-23-386 ehci_hcd
iProduct 2 EHCI Host Controller
iSerial 1 0000:00:0b.2
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 25
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 0
bmAttributes 0xe0
Self Powered
Remote Wakeup
MaxPower 0mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 1
bInterfaceClass 9 Hub
bInterfaceSubClass 0 Unused
bInterfaceProtocol 0 Full speed (or root) hub
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0004 1x 4 bytes
bInterval 12
Hub Descriptor:
bLength 9
bDescriptorType 41
nNbrPorts 4
wHubCharacteristic 0x000a
No power switching (usb 1.0)
Per-port overcurrent protection
TT think time 8 FS bits
bPwrOn2PwrGood 10 * 2 milli seconds
bHubContrCurrent 0 milli Ampere
DeviceRemovable 0x00
PortPwrCtrlMask 0xff
Hub Port Status:
Port 1: 0000.0503 highspeed power enable connect
Port 2: 0000.0100 power
Port 3: 0000.0503 highspeed power enable connect
Port 4: 0000.0100 power
Device Status: 0x0003
Self Powered
Remote Wakeup Enabled
-------------------
Pennina USB
$ cat ./debian-500-i386-netinst.iso | pv -brt > /media/USB\
DISK/debian-500-i386-netinst.iso
150MB 0:00:20 [7,32MB/s]
Compact Flash
$ cat ./debian-500-i386-netinst.iso | pv -brt >
/media/CANON_DC/debian-500-i386-netinst.iso
150MB 0:00:22 [6,72MB/s]
7,32MB/s e 6,72MB/s credo non siano la media del trasferimento, ma con
una divisione si vede che:
Pennina USB circa 7,5 MB/s
Compact Flash circa 6,8 MB/s
Che velocità raggiungete voi e con che dispositivi?
Tanto per capire se con una scheda pci con chipset differente da "VIA"
posso migliorare le prestazoni.
grazie
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