Messages in this thread Patch in this message | | | From | yxlraid@gmail ... | Subject | [PATCH 6/8] [SCSI] mvsas: expander write performance enhancement | Date | Thu, 29 Sep 2011 00:34:55 -0700 |
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From: Xiangliang Yu <yuxiangl@marvell.com>
-- with 1 expander, connect 8 HDD, the write performance will be improved by 80%.
Signed-off-by: Xiangliang Yu <yuxiangl@marvell.com> --- drivers/scsi/mvsas/mv_94xx.c | 9 +++++++++ drivers/scsi/mvsas/mv_defs.h | 1 + 2 files changed, 10 insertions(+), 0 deletions(-)
diff --git a/drivers/scsi/mvsas/mv_94xx.c b/drivers/scsi/mvsas/mv_94xx.c index 4d1a8c7..ba667db 100644 --- a/drivers/scsi/mvsas/mv_94xx.c +++ b/drivers/scsi/mvsas/mv_94xx.c @@ -511,6 +511,15 @@ 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); diff --git a/drivers/scsi/mvsas/mv_defs.h b/drivers/scsi/mvsas/mv_defs.h index dec7cad..8e21482 100644 --- a/drivers/scsi/mvsas/mv_defs.h +++ b/drivers/scsi/mvsas/mv_defs.h @@ -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 { -- 1.7.4.4
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