[PATCH] sky2: interrupt coalescing tuning
Adjust interrupt deferral values for better performance and avoid
starvation issues under stress.
Signed-off-by: Stephen Hemminger <shemminger@osdl.org>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
diff --git a/drivers/net/sky2.c b/drivers/net/sky2.c
index af9739c..0b82dbb 100644
--- a/drivers/net/sky2.c
+++ b/drivers/net/sky2.c
@@ -2115,9 +2115,8 @@
sky2_write8(hw, B0_Y2LED, LED_STAT_ON);
- /* Turn on descriptor polling (every 75us) */
- sky2_write32(hw, B28_DPT_INI, sky2_us2clk(hw, 75));
- sky2_write8(hw, B28_DPT_CTRL, DPT_START);
+ /* Turn off descriptor polling */
+ sky2_write32(hw, B28_DPT_CTRL, DPT_STOP);
/* Turn off receive timestamp */
sky2_write8(hw, GMAC_TI_ST_CTRL, GMT_ST_STOP);
@@ -2162,8 +2161,6 @@
/* Set the list last index */
sky2_write16(hw, STAT_LAST_IDX, STATUS_RING_SIZE - 1);
- sky2_write32(hw, STAT_TX_TIMER_INI, sky2_us2clk(hw, 1000));
-
/* These status setup values are copied from SysKonnect's driver */
if (is_ec_a1(hw)) {
/* WA for dev. #4.3 */
@@ -2174,21 +2171,20 @@
/* set Status-FIFO ISR watermark */
sky2_write8(hw, STAT_FIFO_ISR_WM, 0x07); /* WA for dev. #4.18 */
-
+ sky2_write32(hw, STAT_TX_TIMER_INI, sky2_us2clk(hw, 10000));
} else {
- sky2_write16(hw, STAT_TX_IDX_TH, 0x000a);
-
- /* set Status-FIFO watermark */
- sky2_write8(hw, STAT_FIFO_WM, 0x10);
+ sky2_write16(hw, STAT_TX_IDX_TH, 10);
+ sky2_write8(hw, STAT_FIFO_WM, 16);
/* set Status-FIFO ISR watermark */
if (hw->chip_id == CHIP_ID_YUKON_XL && hw->chip_rev == 0)
- sky2_write8(hw, STAT_FIFO_ISR_WM, 0x10);
+ sky2_write8(hw, STAT_FIFO_ISR_WM, 4);
+ else
+ sky2_write8(hw, STAT_FIFO_ISR_WM, 16);
- else /* WA dev 4.109 */
- sky2_write8(hw, STAT_FIFO_ISR_WM, 0x04);
-
- sky2_write32(hw, STAT_ISR_TIMER_INI, 0x0190);
+ sky2_write32(hw, STAT_TX_TIMER_INI, sky2_us2clk(hw, 1000));
+ sky2_write32(hw, STAT_LEV_TIMER_INI, sky2_us2clk(hw, 100));
+ sky2_write32(hw, STAT_ISR_TIMER_INI, sky2_us2clk(hw, 20));
}
/* enable status unit */