Subject: Re: [Bluez-devel] Extremely slow printing?
From: Marcel Holtmann <marcel@holtmann.org>
To: Jon Valvatne <jon@valvatne.com>
Cc: BlueZ Mailing List <bluez-devel@lists.sourceforge.net>
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Date: Thu, 17 Jun 2004 02:26:53 +0200

Hi Jon,

> I got my bluetooth CF card today, stuck it in my laptop, and I have to
> say I'm very impressed with the status of BlueZ; all my bluetooth
> devices are working fine with minimal effort.
> 
> I'm noticing just one annoyance: I've got a Canon i80 printer with the
> bluetooth module, and printing over bluetooth turns out to be *much*
> slower than printing over USB: A 250K postscript file takes 40 seconds
> to print over USB, but 3 minutes to print over bluetooth.
> 
> I'm not very familiar with the internals of printers and printer
> drivers, so I'm not sure how surprising this is. The raw speed advantage
> that USB has shouldn't be an issue here, since bluetooth's bandwidth
> should still be enough to transfer the data in a couple of seconds. Is
> latency the issue? Or is it inefficiencies in the bluetooth backend for
> CUPS?

maybe the Bluetooth device or chip in the printer is too slow. Do it use
SPP or HCRP?

> I suppose I'll try using Canon's own drivers under Windows, which might
> tell me whether or not this is an inherent problem with printing over
> the bluetooth medium. But I thought I'd ask here as well.

Please check this first, because BlueZ tries to send with the maximum
speed. This must be a hardware issue.

Regards

Marcel


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