[sane-devel] S..L..O..W USB Scanning with Epson 1650

[Justin S. Peavey]

On Fri, Nov 16, 2001 at 09:50:02AM -0500, Justin S. Peavey wrote to To sane-devel at mostang.com:
> On Thu, Nov 15, 2001 at 07:11:26PM -0500, Karl Heinz Kremer wrote to Cc sane-devel at mostang.com:
> > I read your post on the usb group, and your suspicion that this problem
> > is caused by the USB subsystem is very likely correct. The scan times
> > you are listing are definitely not right. You should get about the 
> > same times as you list for the Windows driver. I suspect that it has
> > to do with your dual CPU setup.
> > 
> > Sorry, but I can not help to solve this problem.
> > 
> > Karl Heinz
> > 
> 
> I'm going to try a non-SMP kernel tonight to see if that does
> anything.  The other thing that is tickling my mind is the shared
> interrupts, USB, SCSI, and Network card all sharing the same one.  I
> understand this is much more common now, but the problem looks similar
> to a slowly or mis-handled interrupt.  Anyone know how to force USB to
> it's own interrupt?
> 
> -JSP
> 

On the nose Karl, the scanning works fine when I boot with a non-SMP
kernel.  I'll continue this on the linux-usb group.  Thanks for your
help!

-JSP