[PATCH 3/5] atl1: change cmb write threshold
From: Jay Cliburn <hidden>
Date: 2007-07-19 23:46:55
Also in:
lkml
Subsystem:
networking drivers, the rest · Maintainers:
Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
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 <redacted> --- drivers/net/atl1/atl1_main.c | 5 ++++- 1 files changed, 4 insertions(+), 1 deletions(-)
diff --git a/drivers/net/atl1/atl1_main.c b/drivers/net/atl1/atl1_main.c
index 3b8f633..6aa2dc3 100644
--- a/drivers/net/atl1/atl1_main.c
+++ b/drivers/net/atl1/atl1_main.c@@ -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);
--
1.5.2.2