linux-kernel - Re: 2,6.26-rc4-git2 - long pause during boot

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Message-ID: <Pine.LNX.4.44L0.0806101816290.20539-100000@netrider.rowland.org>
Date:	Tue, 10 Jun 2008 18:19:32 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Chris Clayton <chris2553@...glemail.com>
cc:	James Bottomley <James.Bottomley@...senpartnership.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	<linux-scsi@...r.kernel.org>, Hannes Reinecke <hare@...e.de>,
	"Rafael J. Wysocki" <rjw@...k.pl>, <linux-usb@...r.kernel.org>,
	Stefan Richter <stefanr@...6.in-berlin.de>
Subject: Re: 2,6.26-rc4-git2 - long pause during boot

On Tue, 10 Jun 2008, Chris Clayton wrote:

> What this has shown is that, when I plug in a usb-storage device, there seems 
> to be a delay between the usb/scsi/usb-storage drivers setting up the device 
> and my icon-showing script being run. Here is the snippet from the kernel log 
> file:

...
> Jun 10 20:27:45 upstairs kernel: [ 3200.815772] usb-storage: waiting for device 
> to settle before scanning
> Jun 10 20:27:50 upstairs kernel: [ 3205.817115] scsi 10:0:0:0: Direct-Access              
> USB Flash Memory 5.00 PQ: 0 ANSI: 0 CCS
...

You can eliminate this 5-second delay by adding

	options usb-storage delay_use=0

to /etc/modprobe.conf.  Of course, this will make the other delays just 
stand out that much more sharply...

Alan Stern

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