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Re: Slooooow USB key speeds



On 2/2/09, Kanwar Ranbir Sandhu <m3freak thesandhufamily ca> wrote:
> On Sun, 2009-02-01 at 18:14 -0500, Kanwar Ranbir Sandhu wrote:
>
> > I'm starting to think something is not quite right with the USB key (or
> > in the way it's being detected): I tested transferring files to my PSP,
> > but didn't see any of the same speed issues. I was able to copy large
> > files back and forth without any problems.
>
> More testing with my PSP and the USB stick has revealed large file
> transfers (e.g. 1 GB in size or more) destroy the transfer speed.
> Transfers start up fast (around 20 MBps), and after a few seconds begin
> to drop.
>
> The difference being the Kingston USB stick drops to 1 MBps or less,
> whereas the PSP is able to maintain a speed of around 6.5 MBps.  Both
> devices connect at hi-speed (480 Mbps).
>
> Anyone know what's going on?

Do you see any error messages in /var/log/messages while tranfering? I
had a USB key that was not as linux-compatible as they said in the
brochure and the kernel had to reset the device continuously so I had
very low transfer speeds (save the few seconds, due to buffering).

Cheers

>
> Regards,
>
> Ranbir
>
> --
> Kanwar Ranbir Sandhu
> Linux 2.6.27.12-170.2.5.fc10.x86_64 x86_64 GNU/Linux
> 20:00:01 up 3 days, 21:11, 2 users, load average: 2.41, 0.87, 0.47
>
>
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