This patch increases the sg_tablesize for sym53c8xx from 96 to 128, which enables commands to transfer larger amounts of data (e.g. 512 KB instead of 384 KB, assuming 4 KB non-adjacent pages).
In the current design of sym53c8xx, SYM_CONF_MAX_SG must be set low enough so that (sym_fw1.a_size <= PAGE_SIZE) && (sym_fw2.a_size <= PAGE_SIZE). With SYM_CONF_MAX_SG == 128, sym_fw1.a_size == 3940 and sym_fw2.a_size == 3576 (plus or minus a few bytes depending on other configuration options). The a_size values increase by 16 for every additional sg vector, so SYM_CONF_MAX_SG cannot be set much higher than 128 without making more intrusive changes. Tested on a LSI 53c1010-66. Signed-off-by: Tony Battersby <[EMAIL PROTECTED]> --- --- linux-2.6.24-rc2-git5/drivers/scsi/sym53c8xx_2/sym53c8xx.h.orig 2007-11-15 09:36:03.000000000 -0500 +++ linux-2.6.24-rc2-git5/drivers/scsi/sym53c8xx_2/sym53c8xx.h 2007-11-15 09:36:11.000000000 -0500 @@ -106,7 +106,7 @@ /* * Max number of SG entries. */ -#define SYM_CONF_MAX_SG (96) +#define SYM_CONF_MAX_SG (128) /* * Driver setup structure. - To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
