From e4720dfa9594cb75ef6691e669f81e8207a00e39 Mon Sep 17 00:00:00 2001 From: Gabor Juhos Date: Wed, 23 May 2012 21:05:23 +0000 Subject: [PATCH] ramips: Add byte queue limits support to net/ethernet/ramips_main.c Add byte queue limits support to net/ethernet/ramips_main.c "Byte queue limits are a mechanism to limit the size of the transmit hardware queue on a NIC by number of bytes. The goal of these byte limits is too reduce latency (HOL blocking) caused by excessive queuing in hardware (aka buffer bloat) without sacrificing throughput." Signed-off-by: Tobias Diedrich SVN-Revision: 31844 --- .../files/drivers/net/ethernet/ramips/ramips_main.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/target/linux/ramips/files/drivers/net/ethernet/ramips/ramips_main.c b/target/linux/ramips/files/drivers/net/ethernet/ramips/ramips_main.c index beceb9441e..3d0956860f 100644 --- a/target/linux/ramips/files/drivers/net/ethernet/ramips/ramips_main.c +++ b/target/linux/ramips/files/drivers/net/ethernet/ramips/ramips_main.c @@ -177,6 +177,8 @@ ramips_ring_cleanup(struct raeth_priv *re) txi->tx_skb = NULL; } } + + netdev_reset_queue(re->netdev); } #if defined(CONFIG_RALINK_RT288X) || defined(CONFIG_RALINK_RT3883) @@ -699,6 +701,7 @@ ramips_eth_hard_start_xmit(struct sk_buff *skb, struct net_device *dev) dev->stats.tx_packets++; dev->stats.tx_bytes += skb->len; ramips_fe_wr(tx_next, RAMIPS_TX_CTX_IDX0); + netdev_sent_queue(dev, skb->len); spin_unlock(&re->page_lock); return NETDEV_TX_OK; @@ -780,6 +783,7 @@ ramips_eth_tx_housekeeping(unsigned long ptr) { struct net_device *dev = (struct net_device*)ptr; struct raeth_priv *re = netdev_priv(dev); + unsigned int bytes_compl = 0, pkts_compl = 0; spin_lock(&re->page_lock); while (1) { @@ -792,12 +796,16 @@ ramips_eth_tx_housekeeping(unsigned long ptr) if (!(txd->txd2 & TX_DMA_DONE) || !(txi->tx_skb)) break; + pkts_compl++; + bytes_compl += txi->tx_skb->len; + dev_kfree_skb_irq(txi->tx_skb); txi->tx_skb = NULL; re->skb_free_idx++; if (re->skb_free_idx >= NUM_TX_DESC) re->skb_free_idx = 0; } + netdev_completed_queue(dev, pkts_compl, bytes_compl); spin_unlock(&re->page_lock); ramips_fe_int_enable(RAMIPS_TX_DLY_INT);