(no subject)

[Aleksey Gorelov]

Hi Matt, Alan, 

  Could you please tell me (link would do) why it makes default
delay_use=5 
really necessary (from the patch below)?
https://lists.one-eyed-alien.net/pipermail/usb-storage/2004-August/00074
7.html

It makes USB boot really painfull and slow :(

  I understand there should be a good reason for it. I've tried to find
an answer in 
archives, without much success though.

Thanks,
Aleks.

Re: your mail

[Matthew Dharm]

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It's basically just like the code says.

A lot of devices choke if you access them too quickly after enumeration.
The 5 second delay seems to be enough for most devices.  But we made it
adjustable exactly for people like you.

Matt

On Wed, Feb 02, 2005 at 04:17:13PM -0800, Aleksey Gorelov wrote:
> Hi Matt, Alan, 
> 
>   Could you please tell me (link would do) why it makes default
> delay_use=5 
> really necessary (from the patch below)?
> https://lists.one-eyed-alien.net/pipermail/usb-storage/2004-August/00074
> 7.html
> 
> It makes USB boot really painfull and slow :(
> 
>   I understand there should be a good reason for it. I've tried to find
> an answer in 
> archives, without much success though.
> 
> Thanks,
> Aleks.

-- 
Matthew Dharm                              Home: mdharm-usb@one-eyed-alien.net 
Maintainer, Linux USB Mass Storage Driver

Now payink attention, please.  This is mouse.  Click-click. Easy to 
use, da? Now you try...
					-- Pitr to Miranda
User Friendly, 10/11/1998

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Re: your mail

[Alan Stern]

On Wed, 2 Feb 2005, Aleksey Gorelov wrote:

> Hi Matt, Alan, 
> 
>   Could you please tell me (link would do) why it makes default
> delay_use=5 
> really necessary (from the patch below)?
> https://lists.one-eyed-alien.net/pipermail/usb-storage/2004-August/00074
> 7.html
> 
> It makes USB boot really painfull and slow :(
> 
>   I understand there should be a good reason for it. I've tried to find
> an answer in 
> archives, without much success though.

Lots of devices don't need that delay, but enough of them do that we 
decided to add it.  The value of 5 seconds was more or less arbitrary; it 
was long enough for every device we could test and it didn't seem _too_ 
long.  Maybe 1 second would be long enough -- we just didn't know so we 
were conservative.

Alan Stern