The patch titled
cciss: set sector_size to 2048 for performance
has been added to the -mm tree. Its filename is
cciss-set-sector_size-to-2048-for-performance.patch
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: cciss: set sector_size to 2048 for performance
From: Mike Miller <mike.miller@xxxxxx>
Change the blk_queue_max_sectors from 512 to 2048. This helps increase
performance.
Signed-off-by: Mike Miller <mike.miller@xxxxxx>
Cc: Jens Axboe <jens.axboe@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
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;
_
Patches currently in -mm which might be from mike.miller@xxxxxx are
cciss-version-change.patch
cciss-reference-driver-support.patch
cciss-increase-number-of-commands-on-controller.patch
cciss-fix-pci-ssid-for-the-e500-controller.patch
cciss-disable-dma-prefetch-on-p600.patch
cciss-set-sector_size-to-2048-for-performance.patch
cciss-set-sector_size-to-2048-for-performance-tidy.patch
cciss-change-cciss_open-for-consistency.patch
cciss-remove-unused-revalidate_allvol-function.patch
cciss-add-support-for-1024-logical-volumes.patch
cciss-cleanup-cciss_interrupt-mode.patch
-
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