[sane-devel] [RFC, PATCH] Re: Bug#420193: libsane on sparc64 with SCSI scanner

Julien BLACHE jb at jblache.org
Mon Apr 30 08:01:59 UTC 2007

abel deuring <adeuring at gmx.net> wrote:


>> I think we can even get rid of the old SG interface entirely. SG_IO
>> exists in Linux 2.4 too, so it should be safe.
> I must admit that I am one of these persons who cannot throw away
> anything... But you are right: Doug Gilbert wrote the SG3 interface in
> the late 90ies (IIRC, the first versions were available even for 2.2.x
> kernels), so keeping the old interface would be useful for very few
> people, if any.

According to <http://sg.torque.net/sg/> SG3 was first released in a
stable kernel with Linux 2.4.0 in 2001. It's unclear to me whether
it's been available in Linux 2.2 before that. (are there really people
here still running SANE on a 2.2 kernel ?)

>> The latency here seems low enough, and this machine is an SGI Indigo2
>> R4400SC 200 MHz w/256 MB RAM and an asthmatic SCSI controller (under
>> Linux, at least, because we don't have the specs ...)
> The effects of longer latency times seem to depend heavily on the
> scanner models. The Sharp JX250, a moderately fast model, probably with
> only a tiny internal buffer, seems to suffer more than many other devices...

It'd be nice to gather some feedback on my patch with a couple of
different scanners, that'd set the record straight as far as latency
goes :)


Julien BLACHE                                   <http://www.jblache.org> 
<jb at jblache.org>                                  GPG KeyID 0xF5D65169

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