with everyone having a scanner nowadays, and memory sizes continuously
growing, I don't think that the default buffer size in sg.h is any longer
apprropriate. Since I don't have a better solution, I just set it to the
maximum size (does this limit still exist?).
And I think cdwrite is outdated and not maintained anymore, so I replaced
it with a pointer to cdrecord.
--- linux/Documentation/Configure.help.orig Fri Jan 22 07:45:06 1999
+++ linux/Documentation/Configure.help Fri Jan 22 08:01:10 1999
@@ -3543,12 +3543,17 @@
CDROMs or tapes, say Y here. These won't be supported by the kernel
directly, so you need some additional software which knows how to
talk to these devices using the SCSI protocol. For CD-writers, you
- would need the program cdwrite, available via FTP (user: anonymous)
- from ftp://metalab.unc.edu/pub/Linux/utils/disk-management; for
- other devices, it's possible that you'll have to write the driver
- software yourself, so have a look at the SCSI-HOWTO and at the
- SCSI-Programming-HOWTO, both available via FTP (user: anonymous) in
+ would need the program cdrecord, available via FTP (user: anonymous)
+ from ftp://ftp.fokus.gmd.de/pub/unix/cdrecord/; for other devices,
+ it's possible that you'll have to write the driver software yourself,
+ so have a look at the SCSI-HOWTO and at the SCSI-Programming-HOWTO,
+ both available via FTP (user: anonymous) in
ftp://metalab.unc.edu:/pub/Linux/docs/HOWTO.
+
+ This driver allocates a buffer of 130560 bytes (the current maximum).
+ If you don't need such a large buffer you can save memory by setting
+ the value of SG_BIG_BUFF in include/scsi/sg.h to a smaller value,
+ eg. 32768.
If you want to compile this as a module ( = code which can be
inserted in and removed from the running kernel whenever you want),
--- linux/include/scsi/sg.h Fri Jan 22 07:44:37 1999
+++ linux/include/scsi/sg.h.orig Fri Jan 22 07:43:42 1999
@@ -42,6 +42,6 @@
#define SG_MAX_QUEUE 4 /* maximum outstanding request, arbitrary, may be
changed if sufficient DMA buffer room available */
-#define SG_BIG_BUFF 130560
+#define SG_BIG_BUFF 32768
#endif
hjb
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