Reacting on Hotplug events

Reacting on Hotplug events

[jascha_alte-sauna_net]

Hello,
I want to develop Terminal with an USB Connector. If an USB Stick is
inserted a application on the terminal shall let you select some option
and then some data will be transfered on the USB Stick.

I played around with dbus, had and ivman and got it managed that the Stick
will be automaticly mounted and to execute a script.
The main Problem with this solution is that it quite takes some time. I
would like to know if it is possilbe to speed up that process. Maybe it
helps that I know i only have 1 USB port and only USB sticks should be
processed. The longest time waiting is when syslog show the message:
usb-storage: waiting for device to settle before scanning

Can I somehow decrase the time which has to be waited here?

All other steps are quite fast.

If its not possible to decrease the time I would as least like to react
earlier, so that after inserting the stick there is some kind of please
wait message.

What is the first possibilty to react on inserting a new usb stick, its ok
if there are no drivers loaded and it is not mounted yet?

Thank You
Jascha Schubert


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Re: Reacting on Hotplug events

[Greg KH]

On Tue, Jun 27, 2006 at 11:59:05AM +0200, jascha_alte-sauna_net@lo9.de wrote:
> Hello,
> I want to develop Terminal with an USB Connector. If an USB Stick is
> inserted a application on the terminal shall let you select some option
> and then some data will be transfered on the USB Stick.
> 
> I played around with dbus, had and ivman and got it managed that the Stick
> will be automaticly mounted and to execute a script.
> The main Problem with this solution is that it quite takes some time. I
> would like to know if it is possilbe to speed up that process. Maybe it
> helps that I know i only have 1 USB port and only USB sticks should be
> processed. The longest time waiting is when syslog show the message:
> usb-storage: waiting for device to settle before scanning
> 
> Can I somehow decrase the time which has to be waited here?

That time is due to the timeout in the usb-storage driver where it wants
to wait 5 seconds before scanning the device to handle devices that take
a while to get started up properly.

If you feel you can safely lower that time, just write a new value (in
seconds) to /sys/module/usb_storage/parameters/delay_use

Hope this helps,

greg k-h

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