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[SCSI] mvsas: expander write performance enhancement

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with 1 expander, connect 8 HDD, the write performance will be
improved by 80%.

Signed-off-by: Xiangliang Yu <yuxiangl@marvell.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
This commit is contained in:
Xiangliang Yu 2011-09-29 00:34:55 -07:00 committed by James Bottomley
parent aa117dd143
commit 3a4b7efe7f
2 changed files with 10 additions and 0 deletions
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9
drivers/scsi/mvsas/mv_94xx.c
View File

@ -510,6 +510,15 @@ static int __devinit mvs_94xx_init(struct mvs_info *mvi)
tmp |= CINT_PHY_MASK;
mw32(MVS_INT_MASK, tmp);
/* tune STP performance */
tmp = 0x003F003F;
mvs_cw32(mvi, CMD_PL_TIMER, tmp);
/* This can improve expander large block size seq write performance */
tmp = mvs_cr32(mvi, CMD_PORT_LAYER_TIMER1);
tmp |= 0xFFFF007F;
mvs_cw32(mvi, CMD_PORT_LAYER_TIMER1, tmp);
/* change the connection open-close behavior (bit 9)
* set bit8 to 1 for performance tuning */
tmp = mvs_cr32(mvi, CMD_SL_MODE0);

1
drivers/scsi/mvsas/mv_defs.h
View File

@ -387,6 +387,7 @@ enum sas_cmd_port_registers {
CMD_SL_MODE0 = 0x1BC, /* SL Mode 0 */
CMD_SL_MODE1 = 0x1C0, /* SL Mode 1 */
CMD_PND_FIFO_CTL1 = 0x1C4, /* Pending FIFO Control 1 */
CMD_PORT_LAYER_TIMER1 = 0x1E0, /* Port Layer Timer 1 */
};
enum mvs_info_flags {