Ciao a tutti, mi rivolgo alla lista come ultima spiaggia... :-)
Ho preso un hd esterno USB, per la precisione un Lacie da 750 GiB.
Montato, riconosciuto, configurato un filesystem ext3.
Le prestazioni però non sono quelle che mi aspettavo!
Copiando un file da 1 GB circa ottengo 8-12 MB/s, mentre me ne aspettavo
almeno 30-40 (visto che dovrebbe fare 480 Mbit/s).
Allego un po' di dati...
debian:~# uname -a
Linux debian 2.6.18-6-k7 #1 SMP Mon Aug 18 09:20:26 UTC 2008 i686 GNU/Linux
debian:~# cat /etc/debian_version
4.0
debian:~# lsmod | grep usb
usbhid 37856 0
usb_storage 73024 1
scsi_mod 124872 3 sd_mod,libata,usb_storage
ide_core 110984 5 ide_cd,ide_disk,generic,usb_storage,amd74xx
usbcore 113412 5 usbhid,usb_storage,ehci_hcd,ohci_hcd
debian:~# lspci | grep -i usb
00:02.0 USB Controller: nVidia Corporation nForce2 USB Controller (rev a4)
00:02.1 USB Controller: nVidia Corporation nForce2 USB Controller (rev a4)
00:02.2 USB Controller: nVidia Corporation nForce2 USB Controller (rev a4)
debian:~# lsusb -s3:3 -v
Bus 003 Device 003: ID 059f:1019 LaCie, Ltd
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.00
bDeviceClass 0 (Defined at Interface level)
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 64
idVendor 0x059f LaCie, Ltd
idProduct 0x1019
bcdDevice 0.01
iManufacturer 10 LaCie
iProduct 11 LaCie Desktop Hard Drive
iSerial 3 00E000FD7039C
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 (Zip)
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
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: 0x0001
Self Powered
debian:~# cat /proc/bus/usb/devices
T: Bus=03 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#= 1 Spd=480 MxCh= 6
B: Alloc= 0/800 us ( 0%), #Int= 0, #Iso= 0
D: Ver= 2.00 Cls=09(hub ) Sub=00 Prot=01 MxPS=64 #Cfgs= 1
P: Vendor=0000 ProdID=0000 Rev= 2.06
S: Manufacturer=Linux 2.6.18-6-k7 ehci_hcd
S: Product=EHCI Host Controller
S: SerialNumber=0000:00:02.2
C:* #Ifs= 1 Cfg#= 1 Atr=e0 MxPwr= 0mA
I: If#= 0 Alt= 0 #EPs= 1 Cls=09(hub ) Sub=00 Prot=00 Driver=hub
E: Ad=81(I) Atr=03(Int.) MxPS= 2 Ivl=256ms
T: Bus=03 Lev=01 Prnt=01 Port=04 Cnt=01 Dev#= 3 Spd=480 MxCh= 0
D: Ver= 2.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs= 1
P: Vendor=059f ProdID=1019 Rev= 0.01
S: Manufacturer=LaCie
S: Product=LaCie Desktop Hard Drive
S: SerialNumber=00E000FD7039C
C:* #Ifs= 1 Cfg#= 1 Atr=c0 MxPwr= 2mA
I: If#= 0 Alt= 0 #EPs= 2 Cls=08(stor.) Sub=06 Prot=50 Driver=usb-storage
E: Ad=81(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
E: Ad=02(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
Mi incuriosisce l'output di lsusb quando mi scrive "other device speed".
Vuol dire che devo impostare qualche parametro? Ma dove?
Grazie per qualunque suggerimento!
--
DaC
(metti il becco nel mio blog! http://duffydac.iobloggo.com/)
