Am Freitag, 15. September 2006 22:45 schrieb William Wightman:
> I download usbtree to get this information a little more readable:
>
> /: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=ehci_hcd/6p, 480M
> |__ Port 3: Dev 2, If 0, Class=stor., Driver=usb-storage, 480M
>
>
> Looking at this news ground in early 2005 I tried to get a measure of the
> transfer speed and I ran it twice:
>
> # time dd if=/dev/sda1 of=/tmp/bigFile bs=1M count=100
> 100+0 records in
> 100+0 records out
>
> real 0m7.943s
100MB / 8s = 12.5 MB/s
This is far beyond the USB 1.1 limit.
> user 0m0.004s
> sys 0m2.658s
> # time dd if=/dev/sda1 of=/tmp/bigFile bs=1M count=100
> 100+0 records in
> 100+0 records out
>
> real 0m1.743s
The page cache is working.
> user 0m0.001s
> sys 0m1.716s
> bus are registering as USB2.0 devices but my throughput is very slow, 20G
> file ~ 28-34 minutes. Either A) My math is off and this is the best I can
I compute this to about 10MB/s. Still way beyond the USB 1.1 limit.
Regards
Oliver
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