> Hi folks. I just went almost mad tracking a very strange problem with sane
> 1.0.0, kernel 2.2.5 and glibc 2.1. I do not know, if it is fixed in 1.0.1.
> If so, please disregard this mail.
I run linux-2.2.5/x86 and sane-1.0.1 (SuSE-6.1)
after I changed the SG_BIG_BUFF to 128K in both sg.h files and recompiled the
kernel and sane everything works fine!
>
> O.K. - the problem is as follows:
>
> I wanted to increase SG_BIG_BUFF to get less scanner stops and thus increase
> throughput.
>
> Error #1: I had been told, that 256k were safe. This is correct, but only
> for Linux/alpha. The correct boundary is 32*PAGE_SIZE, wich is 4k*32=128k
> for Intel, but 8k*32=256k for Alpha.
>
> We should put that information in a README within SANE, not in the
> sg-readme, which is pretty obscure to find.
In the manpage sane-scsi there is written:
XX Unless a system is seriously
XX short on memory, it is recommended to increase this value
XX to the maximum legal value of 128*1024-512=130560 bytes.
> Now the big one that made me pull my hair:
>
> Glibc installs its _own_ scsi.h and sg.h, which are different from the
> kernel. Thus is you only edit sg.h from the Linux subdirectory you get very
> very weird behaviour:
This is something that should be changed in ther kernel surces/glic.
Bye
Oliver
-- EMAIL: Oliver.Rauch@Wolfsburg.DE WWW: http://www.wolfsburg.de/~rauch
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