From: Torben Mathiasen <torben.mathiasen@hp.com>
After a lot of testing and measuring we decided to increase the read-ahead
for the CISS driver in 2.6 to 1MB.
---
25-akpm/drivers/block/cciss.c | 3 ++-
1 files changed, 2 insertions(+), 1 deletion(-)
diff -puN drivers/block/cciss.c~cciss-increase-vm-readahead drivers/block/cciss.c
--- 25/drivers/block/cciss.c~cciss-increase-vm-readahead Wed Feb 4 13:57:02 2004
+++ 25-akpm/drivers/block/cciss.c Wed Feb 4 13:57:02 2004
@@ -103,7 +103,7 @@ static struct board_type products[] = {
/*define how many times we will try a command because of bus resets */
#define MAX_CMD_RETRIES 3
-#define READ_AHEAD 128
+#define READ_AHEAD 256
#define NR_CMDS 384 /* #commands that can be outstanding */
#define MAX_CTLR 8
@@ -2501,6 +2501,7 @@ static int __devinit cciss_init_one(stru
if (!q)
goto clean4;
+ q->backing_dev_info.ra_pages = READ_AHEAD;
hba[i]->queue = q;
q->queuedata = hba[i];
_