[PATCH 5/6] skge: increase TX threshold for Jumbo
From: Stephen Hemminger <hidden>
Date: 2007-11-26 20:04:13
Need to increase TX threshold when doing Jumbo frames on dual port board to avoid underruns. (Code from sk98lin). Signed-off-by: Stephen Hemminger <redacted>
--- a/drivers/net/skge.c 2007-11-21 14:05:59.000000000 -0800
+++ b/drivers/net/skge.c 2007-11-21 14:06:15.000000000 -0800@@ -1633,15 +1633,14 @@ static void genesis_mac_init(struct skge } xm_write16(hw, port, XM_RX_CMD, r); - /* We want short frames padded to 60 bytes. */ xm_write16(hw, port, XM_TX_CMD, XM_TX_AUTO_PAD); - /* - * Bump up the transmit threshold. This helps hold off transmit - * underruns when we're blasting traffic from both ports at once. - */ - xm_write16(hw, port, XM_TX_THR, 512); + /* Increase threshold for jumbo frames on dual port */ + if (hw->ports > 1 && jumbo) + xm_write16(hw, port, XM_TX_THR, 1020); + else + xm_write16(hw, port, XM_TX_THR, 512); /* * Enable the reception of all error frames. This is is
--
Stephen Hemminger <shemminger@linux-foundation.org>