From: Mike Miller Change the blk_queue_max_sectors from 512 to 2048. This helps increase performance. Signed-off-by: Mike Miller Cc: Jens Axboe Signed-off-by: Andrew Morton --- drivers/block/cciss.c | 12 +++++++++--- drivers/block/cciss.h | 1 + 2 files changed, 10 insertions(+), 3 deletions(-) diff -puN drivers/block/cciss.c~cciss-set-sector_size-to-2048-for-performance drivers/block/cciss.c --- a/drivers/block/cciss.c~cciss-set-sector_size-to-2048-for-performance +++ a/drivers/block/cciss.c @@ -269,6 +269,7 @@ static int cciss_proc_get_info(char *buf "Firmware Version: %c%c%c%c\n" "IRQ: %d\n" "Logical drives: %d\n" + "Sector size: %d\n" "Current Q depth: %d\n" "Current # commands on controller: %d\n" "Max Q depth since init: %d\n" @@ -279,7 +280,9 @@ static int cciss_proc_get_info(char *buf (unsigned long)h->board_id, h->firm_ver[0], h->firm_ver[1], h->firm_ver[2], h->firm_ver[3], (unsigned int)h->intr[SIMPLE_MODE_INT], - h->num_luns, h->Qdepth, h->commands_outstanding, + h->num_luns, + h->cciss_sector_size, + h->Qdepth, h->commands_outstanding, h->maxQsinceinit, h->max_outstanding, h->maxSG); pos += size; @@ -1389,7 +1392,7 @@ static void cciss_update_drive_info(int /* This is a limit in the driver and could be eliminated. */ blk_queue_max_phys_segments(disk->queue, MAXSGENTRIES); - blk_queue_max_sectors(disk->queue, 512); + blk_queue_max_sectors(disk->queue, h->cciss_sector_size); blk_queue_softirq_done(disk->queue, cciss_softirq_done); @@ -3341,6 +3344,9 @@ static int __devinit cciss_init_one(stru hba[i]->access.set_intr_mask(hba[i], CCISS_INTR_ON); cciss_procinit(i); + + hba[i]->cciss_sector_size = 2048; + hba[i]->busy_initializing = 0; for (j = 0; j < NWD; j++) { /* mfm */ @@ -3365,7 +3371,7 @@ static int __devinit cciss_init_one(stru /* This is a limit in the driver and could be eliminated. */ blk_queue_max_phys_segments(q, MAXSGENTRIES); - blk_queue_max_sectors(q, 512); + blk_queue_max_sectors(q, hba[i]->cciss_sector_size); blk_queue_softirq_done(q, cciss_softirq_done); diff -puN drivers/block/cciss.h~cciss-set-sector_size-to-2048-for-performance drivers/block/cciss.h --- a/drivers/block/cciss.h~cciss-set-sector_size-to-2048-for-performance +++ a/drivers/block/cciss.h @@ -77,6 +77,7 @@ struct ctlr_info unsigned int intr[4]; unsigned int msix_vector; unsigned int msi_vector; + int cciss_sector_size; BYTE cciss_read; BYTE cciss_write; BYTE cciss_read_capacity; _