# Re: Linux Sense buffer (was: sane 0.71 and microtek E3)

Rogier Wolff (R.E.Wolff@BitWizard.nl)
Tue, 31 Mar 1998 10:59:00 +0200 (MET DST)

- Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]
- Next message: Hugo van der Kooij: "Re: Patch to 0.71 spec file"
- Previous message: Rogier Wolff: "Re: Linux Sense buffer (was: sane 0.71 and microtek E3)"
- In reply to: David Mosberger-Tang: "Re: Linux Sense buffer (was: sane 0.71 and microtek E3)"

David Mosberger-Tang wrote:
> But I agree it's bad taste to ship pre-compiled binaries assuming a
> 128KB kernel buffer. The real problem is that the Linux kernel
> doesn't allow to determine what the limit is. I'll see whether we
> could have that fixed for Linux 2.2.

David, I've been thinking about this. There is a possibility.

1) (Implemented for my standalone tamarack scan-driver). A -buf option
that allows the user to select the buffer size to be used at runtime.
(I've got a "decent" kernel right now, but the last half year I've been
running a kernel without the increased buffer size, and had to pass the
-buf 32000 every time... ;-)

2) (not implemented yet) Simply try with a large buffer, and if you
get "ENOMEM", reduce the buffer size automatically.

Roger.

P.S. "large buffer" in my kernel means 1Mb.

    --
    If it's there and you can see it, it's REAL      |___R.E.Wolff@BitWizard.nl  |
    If it's there and you can't see it, it's TRANSPARENT |  Tel: +31-15-2137555  |
    If it's not there and you can see it, it's VIRTUAL   |__FAX:_+31-15-2138217  |
    If it's not there and you can't see it, it's GONE! -- Roy Wilks, 1983  |_____|

    --
    Source code, list archive, and docs: http://www.mostang.com/sane/
    To unsubscribe: echo unsubscribe sane-devel | mail majordomo@mostang.com

     Next message: Hugo van der Kooij: "Re: Patch to 0.71 spec file"
     Previous message: Rogier Wolff: "Re: Linux Sense buffer (was: sane 0.71 and microtek E3)"
     In reply to: David Mosberger-Tang: "Re: Linux Sense buffer (was: sane 0.71 and microtek E3)"