On Thu, 2007-11-15 at 10:06 -0500, Tony Battersby wrote: > 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. This has been suggested before. I thought the problem was there were some cards of the 875 ilk that choke on a sg table larger than 96? If I recall the conversation correctly, the claim was made, but no-one managed to turn up the errata that showed it. James - To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
