Re: what about cdrecord ?
On Oct 08, Frank Petzold wrote:
> jk@espy.org writes:
> > At 12:23 -0700 1999-10-01, C.M. Connelly wrote:
> > >The parameter is SHMMAX, #defined in /usr/src/linux/include/asm*/shmparam.h.
> > >This parameter is set to 4 MB by default in older (pre-2.2.10)
> > >kernels, but has been changed in more recent versions of the Vger
> > >source code (presumably these patches have propagated to the main
> > >source tree, but I wouldn't take it on faith).
> >
> > % grep '^#define SHMMAX' ~kernel/2.2.13pre/include/asm-ppc/shmparam.h
> > #define SHMMAX 0x2000000 /* max shared seg size (bytes) */
> >
> > The parameter is also tunable at runtime via /proc/sys/kernel/shmmax,
> > the value is in decimal bytes.
> > So 32MB (the current default) can be set via
> > echo 33554432 > /proc/sys/kernel/shmmax
>
> I have recompiled the kernel (APUS 2.2.10) with #define SHMMAX
> 0x2000000, but now the system hangs when I try to write an image in
> xcdroast. Are there other parameters to adjust, too? Or is this an
> APUS specific problem?
Reliable CD recording is something of a black art. 8X recording on my
P III-450 with Adaptec 2940U generally only succeeds under low system
loads (although to be fair my source and destination drives are on the
same card). Amiga SCSI cards may be too slow to keep up (I know I had
problems under APUS with both a A4091 and GVP Series II). The SCSI
drivers are probably also buggy...
Chris
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