[PATCH] cciss: set sector_size to 2048 for performance

Change the blk_queue_max_sectors from 512 to 2048.  This helps increase
performance.

[akpm@osdl.org: s/sector_size/max_sectors/]
Signed-off-by: Mike Miller <mike.miller@hp.com>
Cc: Jens Axboe <jens.axboe@oracle.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

2 files changed, 10 insertions, 3 deletions

diff --git a/drivers/block/cciss.c b/drivers/block/cciss.c
index a17223c43aeb..e61279f6f26e 100644
--- a/drivers/block/cciss.c
+++ b/drivers/block/cciss.c
@@ -269,6 +269,7 @@ static int cciss_proc_get_info(char *buffer, char **start, off_t offset,
                        "Firmware Version: %c%c%c%c\n"
                        "IRQ: %d\n"
                        "Logical drives: %d\n"
+                       "Max sectors: %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 *buffer, char **start, off_t offset,
                        (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_max_sectors,
+                       h->Qdepth, h->commands_outstanding,
                        h->maxQsinceinit, h->max_outstanding, h->maxSG);
 
         pos += size;
@@ -1395,7 +1398,7 @@ static void cciss_update_drive_info(int ctlr, int drv_index)
                 /* 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_max_sectors);
 
                 blk_queue_softirq_done(disk->queue, cciss_softirq_done);
 
@@ -3347,6 +3350,9 @@ static int __devinit cciss_init_one(struct pci_dev *pdev,
         hba[i]->access.set_intr_mask(hba[i], CCISS_INTR_ON);
 
         cciss_procinit(i);
+
+        hba[i]->cciss_max_sectors = 2048;
+
         hba[i]->busy_initializing = 0;
 
         for (j = 0; j < NWD; j++) {     /* mfm */
@@ -3371,7 +3377,7 @@ static int __devinit cciss_init_one(struct pci_dev *pdev,
                 /* 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_max_sectors);
 
                 blk_queue_softirq_done(q, cciss_softirq_done);
 
diff --git a/drivers/block/cciss.h b/drivers/block/cciss.h
index 0d765f9237be..c3df673f860b 100644
--- a/drivers/block/cciss.h
+++ b/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_max_sectors;
         BYTE    cciss_read;
         BYTE    cciss_write;
         BYTE    cciss_read_capacity;