On Sun, 21 Feb 1999, Kurt Garloff wrote:
> On Sat, Feb 20, 1999 at 10:52:16PM +0100, Gerard Roudier wrote:
> > >
> > > Latest linux scsi subsystem still tries to allocate huge physically
> > > contiguous memory chunk. I know that large buffers are needed for devices
> > > as CD-R, scanners and friends, since Linus^Hx does not allow to DMA from
> > > userland. However, allocating large physically contiguous buffers should
> > > _never_ have been the solution, because it is only guaranteed to succeed
> > > at system start-up and it is wasting memory to pool huge buffers when they
> > > are not used.
> > >
> >
> > I mentionned the mt driver in the post below and obviously meant 'st'
> > instead. The st driver uses scatter lists since linux-2.1.121 and I
> > just missed this improvement.
> > Btw, the author of the st driver didn't miss my mistake. :)
>
> But for the sg driver, needed for cdrecord and scanning, e.g., the problem
> persists. There was a discussion about improvement of sg driver on this
> list, a couple of weeks ago. Maybe you want to talk to Joerg Schilling
> <[EMAIL PROTECTED]> about it.
I haven't time anymore for discussion about this topic. I did spend much
more time with the discussion that the amount of time needed to make some
version 0 improvement that, at least, will work for me, and allocate
memory as this _shall_ be done.
For now I donnot have CD-R nor scanner, but this may come.
Btw, I have some code that may work, at least for me, once debugged.
For the moment, it makes scsi-config quite comfortable using
scsi_ioctl_send_command.
Regards,
G�rard.
> --
> Kurt Garloff <[EMAIL PROTECTED]> [Dortmund, FRG]
> Plasma physics, high perf. computing [Linux-ix86,-axp, DUX]
> PGP key: see mailheader [Linux SCSI driver: DC390]
>
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