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[PATCH] sky2: interrupt coalescing tuning

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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>
This commit is contained in:
Stephen Hemminger 2005-12-09 11:35:06 -08:00 committed by Jeff Garzik
parent 3e4b32e116
commit 69634ee736
1 changed files with 11 additions and 15 deletions
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26
drivers/net/sky2.c
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@ -2115,9 +2115,8 @@ static int sky2_reset(struct sky2_hw *hw)
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 @@ static int sky2_reset(struct sky2_hw *hw)
/* 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 @@ static int sky2_reset(struct sky2_hw *hw)
/* 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 */