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| author | Robert Elliott <elliott@hp.com> | 2015-01-23 16:43:41 -0600 |
|---|---|---|
| committer | James Bottomley <JBottomley@Parallels.com> | 2015-02-02 09:57:41 -0800 |
| commit | 33811026a0a4208dd5725183d37fc92d5e88b0a2 (patch) | |
| tree | 3ee9c60da0de30a40ea02be9db13b5c75fcb0ea4 /drivers/scsi/hpsa.h | |
| parent | 281a7fd03ea37c979bbba4d8376595c0288e3252 (diff) | |
| download | linux-33811026a0a4208dd5725183d37fc92d5e88b0a2.tar.gz linux-33811026a0a4208dd5725183d37fc92d5e88b0a2.tar.bz2 linux-33811026a0a4208dd5725183d37fc92d5e88b0a2.zip | |
hpsa: optimize cmd_alloc function by remembering last allocation
Empirically, this improves performance slightly (~2% max IOPS) by
allowing cmd_alloc to remember where it left off searching for
free commands between calls instead of always starting its search
at command 0.
Reviewed-by: Scott Teel <scott.teel@pmcs.com>
Signed-off-by: Robert Elliott <elliott@hp.com>
Signed-off-by: Don Brace <don.brace@pmcs.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'drivers/scsi/hpsa.h')
| -rw-r--r-- | drivers/scsi/hpsa.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/scsi/hpsa.h b/drivers/scsi/hpsa.h index 679e4d2272e0..981479a13935 100644 --- a/drivers/scsi/hpsa.h +++ b/drivers/scsi/hpsa.h @@ -133,6 +133,7 @@ struct ctlr_info { struct CfgTable __iomem *cfgtable; int interrupts_enabled; int max_commands; + int last_allocation; atomic_t commands_outstanding; # define PERF_MODE_INT 0 # define DOORBELL_INT 1 |