USB 2.0 with bogus Data Rate

[Carlos Silva aka|Danger_Man|]

Julian Elischer wrote:

>
>
> Carlos Silva aka|Danger_Man| wrote:
>
>> Hi hackers,
>>
>> I have a little problem with my external disk drive, my data transfer 
>> rate is 1.000MB/s.
>> I have USB 2.0 so the rate is larger, right?
>> Somebody has an idea how to enlarge the rate?
>
>
>
> the data rate is bogus because it is printed by the scsi/cam code
> which doesn't know about USB speeds.
>
> This has been improved in 6.x and may flow back to 5.4..
> in the meantime, ignore that number and use
> dd if=/dev/da0 of=/dev/null bs=64k
> to see what your rate really is..


Here is the rate:

osiris# dd if=/dev/da0 of=/dev/null bs=64k
^C16+0 records in
16+0 records out
1048576 bytes transferred in 14.741515 secs (71131 bytes/sec)
osiris#

Ugly!

regards

>
>>
>> Regards,
>>
>> Carlos
>>
>>
>> osiris# dmesg | grep usb && dmesg | grep da0
>> usb0: <Intel 82371AB/EB (PIIX4) USB controller> on uhci0
>> usb0: USB revision 1.0
>> usb1: <VIA 83C572 USB controller> on uhci1
>> usb1: USB revision 1.0
>> usb2: <VIA 83C572 USB controller> on uhci2
>> usb2: USB revision 1.0
>> ehci_pci_attach: companion usb1
>> ehci_pci_attach: companion usb2
>> usb3: EHCI version 0.95
>> usb3: companion controllers, 2 ports each: usb1 usb2
>> usb3: <EHCI (generic) USB 2.0 controller> on ehci0
>> usb3: USB revision 2.0
>> GEOM: create disk da0 dp=0xc2d96850
>> da0 at umass-sim0 bus 0 target 0 lun 0
>> da0: <USB 2.0 Storage Device 0100> Fixed Direct Access SCSI-0 device
>> da0: 1.000MB/s transfers
>> da0: 190782MB (390721968 512 byte sectors: 255H 63S/T 24321C)
>> osiris#
>>
>> osiris# usbdevs
>> addr 1: UHCI root hub, Intel
>> addr 1: UHCI root hub, VIA
>> addr 1: UHCI root hub, VIA
>> addr 2: USB 2.0 Storage Device, Acer Labs
>> addr 1: EHCI root hub, (0x1106)
>> osiris#
>>
>> osiris# camcontrol devlist
>> <USB 2.0 Storage Device 0100>      at scbus0 target 0 lun 0 (da0,pass0)
>> osiris#
>>
>>
>>
>>
>>
>> _______________________________________________
>> freebsd-hackers at freebsd.org mailing list
>> http://lists.freebsd.org/mailman/listinfo/freebsd-hackers
>> To unsubscribe, send any mail to 
>> "freebsd-hackers-unsubscribe at freebsd.org"
>
>
> _______________________________________________
> freebsd-hackers at freebsd.org mailing list
> http://lists.freebsd.org/mailman/listinfo/freebsd-hackers
> To unsubscribe, send any mail to 
> "freebsd-hackers-unsubscribe at freebsd.org"