Hi John,
No one can really help when you supply no real informaion.
regards,
Stephen.
On Mon, 17 Jan 2005, John H. wrote:
> this morning i copied ~50mb from the usb 2.0
> thumbdrive in XP, it was nearly instant, a BIG speed
> difference from linux, despite being listed as 480mb/s
>
>
> --- "Stephen J. Gowdy" <[EMAIL PROTECTED]>
> wrote:
>
> > Can you actually say how fast it is? How did you
> > test it in both OSes?
> >
> > On Sun, 16 Jan 2005, John H. wrote:
> >
> > > modinfo ub
> > > modinfo: could not find module ub
> > >
> > > It's as slow as it is in my usb 1.1 laptop.
> > However,
> > > in WINXP, it's WAY faster.
> > >
> > >
> > > --- Alan Stern <[EMAIL PROTECTED]> wrote:
> > >
> > > > On Sun, 16 Jan 2005, Stephen J. Gowdy wrote:
> > > >
> > > > > On Sun, 16 Jan 2005, John H. wrote:
> > > > >
> > > > > > My usb 2.0 devices(SD card reader and usb
> > thumb
> > > > > > drive), while being listed w/usbview as
> > 480mb/s,
> > > > are
> > > > > > going around 1.1 speed.
> > > > > >
> > > > > > ehci-hcd is loaded, what else could be the
> > > > problem?
> > > > >
> > > > > They are just slow? What speed are you
> > actually
> > > > seeing.
> > > >
> > > > Stephen is right. You have to be careful when
> > > > talking about things like
> > > > this. If usbview lists a device as using 480
> > Mb/s
> > > > then that's the speed
> > > > it's using. Now maybe the _throughput_ is lower
> > > > than you expect -- but
> > > > that's a different matter. You can also see the
> > > > speed in
> > > > /proc/bus/usb/devices (or wherever you have the
> > > > usbfs filesystem mounted).
> > > >
> > > > A decrease in speed could be caused by ub device
> > > > driver. Are your devices
> > > > bound to usb-storage or to ub? If they are
> > using ub
> > > > then you have to
> > > > disable the ub driver in the kernel
> > configuration.
> > > >
> > > > > > Also, I noticed on upgrade to fc3,
> > /proc/bus/usb
> > > > was
> > > > > > no longer mounted, so I added it to fstab.
> > > > > >
> > > > > > Do I need to? Can I just have /sys/bus/usb,
> > > > which is
> > > > > > up by default?
> > > > >
> > > > > It isn't needed for normal operations I
> > believe,
> > > > but it is very useful to
> > > > > find out what is going on. I've not actually
> > > > looked in /sys/bus/usb,
> > > > > perhaps it is very similar?
> > > >
> > > > It doesn't matter where the usbfs filesystem is
> > > > mounted; it will still
> > > > contain the same information. However there's
> > > > probably a lot of programs
> > > > that expect to find it under /proc/bus/usb, so
> > it
> > > > might be a good idea to
> > > > keep it there. (Unless Fedora 3 deliberately
> > has
> > > > changed things so that
> > > > the programs now expect to find it under
> > > > /sys/bus/usb, but I don't think
> > > > they have. The kernel's usbfs driver still
> > creates
> > > > the /proc/bus/usb
> > > > directory.)
> > > >
> > > > Alan Stern
> > > >
> > > >
> > >
> > >
> > >
> > >
> > > __________________________________
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> >
> > --
> >
> >
> /------------------------------------+-------------------------\
> > |Stephen J. Gowdy | SLAC,
> > MailStop 34, |
> > |http://www.slac.stanford.edu/~gowdy/ | 2575 Sand
> > Hill Road, |
> > |http://calendar.yahoo.com/gowdy | Menlo Park
> > CA 94025, USA |
> > |EMail: [EMAIL PROTECTED] | Tel: +1 650
> > 926 3144 |
> >
> >
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--
/------------------------------------+-------------------------\
|Stephen J. Gowdy | SLAC, MailStop 34, |
|http://www.slac.stanford.edu/~gowdy/ | 2575 Sand Hill Road, |
|http://calendar.yahoo.com/gowdy | Menlo Park CA 94025, USA |
|EMail: [EMAIL PROTECTED] | Tel: +1 650 926 3144 |
\------------------------------------+-------------------------/
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