linux-kernel - Re: [PATCH RFC] USB: Add HCD fastboot

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Date:	Wed, 6 Aug 2008 16:09:21 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Arjan van de Ven <arjan@...radead.org>
cc:	Simon Arlott <simon@...e.lp0.eu>,
	Rene Herman <rene.herman@...access.nl>,
	<linux-kernel@...r.kernel.org>, <mingo@...e.hu>,
	Daniel Walker <dwalker@...sta.com>,
	USB list <linux-usb@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...e.de>
Subject: Re: [PATCH RFC] USB: Add HCD fastboot

On Wed, 6 Aug 2008, Arjan van de Ven wrote:

> On Wed, 6 Aug 2008 15:49:27 -0400 (EDT)
> Alan Stern <stern@...land.harvard.edu> wrote:
> 
> > On Wed, 6 Aug 2008, Simon Arlott wrote:
> > 
> > > > Wouldn't it be much simpler, and less objectionable, to do what I
> > > > suggested earlier?  That is, add a 5-second delay at the start of
> > > > hub_thread() in drivers/usb/core/hub.c.  No messing with
> > > > Makefiles, no changes to the initcall scheduling.
> > > 
> > > Aside from 5 seconds being too long, and anything less being a race
> > > between hub_thread() and driver initcalls, it doesn't improve
> > > anything because it'll still have to wait for the devices to finish
> > > initialising in userspace instead.
> > 
> > Why is 5 seconds too long?  Too long for what?
> 
> because I'm done booting to full UI in that time.
> 
> it's forever.

This doesn't answer my question.  Why does the fact that you're already 
in the UI after 5 seconds mean that 5 seconds is too long to delay the 
start of khubd?

Besides, if your machine can boot to the UI in under 5 seconds then you 
have no need to worry about improving boot-up speed anyway.

Alan Stern

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