diff --git a/drivers/block/cciss.c b/drivers/block/cciss.c index 62b6c2cc80b5e9d7ef68a7ff84a447e24bb7ade5..d2d95ff5353b08a4f49d1c3da4179090751851bf 100644 --- a/drivers/block/cciss.c +++ b/drivers/block/cciss.c @@ -4257,6 +4257,13 @@ static void cciss_find_board_params(ctlr_info_t *h) cciss_get_max_perf_mode_cmds(h); h->nr_cmds = h->max_commands - 4 - cciss_tape_cmds; h->maxsgentries = readl(&(h->cfgtable->MaxSGElements)); + /* + * The P600 may exhibit poor performnace under some workloads + * if we use the value in the configuration table. Limit this + * controller to MAXSGENTRIES (32) instead. + */ + if (h->board_id == 0x3225103C) + h->maxsgentries = MAXSGENTRIES; /* * Limit in-command s/g elements to 32 save dma'able memory. * Howvever spec says if 0, use 31