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

[Karl Heinz Kremer]

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

On Thu, Nov 15, 2001 at 06:57:12PM -0500, Justin S. Peavey wrote:
> On Thu, Nov 15, 2001 at 06:43:06PM -0500, Karl Heinz Kremer wrote to To Justin S. Peavey:
> > Can you please give some examples of scan times with information
> > about the size and the resolution of the scans.
> > 
> > Do you get any messages on the console that are related to the USB
> > system?
> > 
> > Karl Heinz
> 
> A typical 300dpi scan of a 4x6 color picture takes about 20 seconds
> running under Windows, and about 7-10 minutes under Linux.  A 1200 DPI
> scan takes about 5-7 minutes under Windows, and over 2 hours under
> linux (not quite sure, I killed it at two hours).  
> 
> I've tried both the uhci and usb-uhci modules without any noticeable
> change, and there are no USB messages on console except normal scanner
> detection (following)
> 
> Nov 15 17:52:48 stout kernel: hub.c: USB hub found
> Nov 15 17:52:48 stout kernel: hub.c: 2 ports detected
> Nov 15 17:52:48 stout kernel: hub.c: USB new device connect on bus1/2,
> assigned device number 2
> Nov 15 17:52:50 stout kernel: usb.c: USB device 2 (vend/prod
> 0x4b8/0x110) is not claimed by any active driver.
> Nov 15 17:53:05 stout kernel: usb.c: registered new driver usbscanner
> Nov 15 17:53:05 stout kernel: scanner.c: probe_scanner: User specified
> USB scanner -- Vendor:Product - 4b8:110
> Nov 15 17:53:05 stout kernel: devfs: devfs_register(): device already
> registered: "scanner0"
> Nov 15 17:53:05 stout kernel: scanner.c: 0.4.6:USB Scanner Driver
> 
> -J
> 
> 
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-- 
Karl Heinz Kremer                                  khk at khk.net
PGP Key at http://www.freecolormanagement.com/download/khk.asc
EPSON Sane Backend:         http://www.freecolormanagement.com
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