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atl1: change cmb write threshold 

Change the threshold number of descriptors used to trigger CMB writes.
The vendor reports that under certain conditions this will reduce the
number of unnecessary tx interrupts and improve rx performance.

This change is lifted directly from vendor version 1.2.40.2 of the L1
driver.

Signed-off-by: Jay Cliburn <jacliburn@bellsouth.net>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Jay Cliburn 2007-07-19 18:45:12 -05:00 committed by Jeff Garzik
parent 3f516c00d4
commit 91a500ac56
1 changed files with 4 additions and 1 deletions
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5
drivers/net/atl1/atl1_main.c
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@ -917,7 +917,10 @@ static u32 atl1_configure(struct atl1_adapter *adapter)
iowrite32(value, hw->hw_addr + REG_DMA_CTRL);
/* config CMB / SMB */
value = hw->cmb_rrd | ((u32) hw->cmb_tpd << 16);
value = (hw->cmb_tpd > adapter->tpd_ring.count) ?
hw->cmb_tpd : adapter->tpd_ring.count;
value <<= 16;
value |= hw->cmb_rrd;
iowrite32(value, hw->hw_addr + REG_CMB_WRITE_TH);
value = hw->cmb_rx_timer | ((u32) hw->cmb_tx_timer << 16);
iowrite32(value, hw->hw_addr + REG_CMB_WRITE_TIMER);