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Commit 6c197093 authored by Chaitra P B's avatar Chaitra P B Committed by Martin K. Petersen
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mpt3sas: Set maximum transfer length per IO to 4MB for VDs 



Set maximum transfer length per IO on RAID volumes to 4MB by setting
VD's queue's max_sector to 8192.

Signed-off-by: default avatarChaitra P B <chaitra.basappa@broadcom.com>
Reviewed-by: default avatarTomas Henzl <thenzl@redhat.com>
Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
parent b2500d76

drivers/scsi/mpt3sas/mpt3sas_base.h

+2 −0
Original line number Diff line number Diff line
@@ -112,6 +112,8 @@ 
#define MPT3SAS_SAS_QUEUE_DEPTH		254

#define MPT3SAS_RAID_QUEUE_DEPTH	128



#define MPT3SAS_RAID_MAX_SECTORS	8192



#define MPT_NAME_LENGTH			32	/* generic length of strings */

#define MPT_STRING_LENGTH		64

drivers/scsi/mpt3sas/mpt3sas_scsih.c

+8 −0
Original line number Diff line number Diff line
@@ -1909,6 +1909,14 @@ scsih_slave_configure(struct scsi_device *sdev) 
			    (unsigned long long)raid_device->wwid,

			    raid_device->num_pds, ds);



		if (shost->max_sectors > MPT3SAS_RAID_MAX_SECTORS) {

			blk_queue_max_hw_sectors(sdev->request_queue,

						MPT3SAS_RAID_MAX_SECTORS);

			sdev_printk(KERN_INFO, sdev,

					"Set queue's max_sector to: %u\n",

						MPT3SAS_RAID_MAX_SECTORS);

		}



		scsih_change_queue_depth(sdev, qdepth);



		/* raid transport support */