From 2b65326e67f89899e8bcaed1989d8cfb0ed01f55 Mon Sep 17 00:00:00 2001 From: Jesse Brandeburg Date: Fri, 15 Dec 2006 10:30:44 +0100 Subject: [PATCH] e1000: dynamic itr: take TSO and jumbo into account The dynamic interrupt rate control patches omitted proper counting for jumbo's and TSO resulting in suboptimal interrupt mitigation strategies. Signed-off-by: Jesse Brandeburg Signed-off-by: Auke Kok Signed-off-by: Arjan van de Ven Signed-off-by: Jeff Garzik --- drivers/net/e1000/e1000_main.c | 40 ++++++++++++++++++++++++---------------- 1 file changed, 24 insertions(+), 16 deletions(-) diff --git a/drivers/net/e1000/e1000_main.c b/drivers/net/e1000/e1000_main.c index 73f3a85fd23..62ef267b3d6 100644 --- a/drivers/net/e1000/e1000_main.c +++ b/drivers/net/e1000/e1000_main.c @@ -2628,29 +2628,34 @@ static unsigned int e1000_update_itr(struct e1000_adapter *adapter, if (packets == 0) goto update_itr_done; - switch (itr_setting) { case lowest_latency: - if ((packets < 5) && (bytes > 512)) + /* jumbo frames get bulk treatment*/ + if (bytes/packets > 8000) + retval = bulk_latency; + else if ((packets < 5) && (bytes > 512)) retval = low_latency; break; case low_latency: /* 50 usec aka 20000 ints/s */ if (bytes > 10000) { - if ((packets < 10) || - ((bytes/packets) > 1200)) + /* jumbo frames need bulk latency setting */ + if (bytes/packets > 8000) + retval = bulk_latency; + else if ((packets < 10) || ((bytes/packets) > 1200)) retval = bulk_latency; else if ((packets > 35)) retval = lowest_latency; - } else if (packets <= 2 && bytes < 512) + } else if (bytes/packets > 2000) + retval = bulk_latency; + else if (packets <= 2 && bytes < 512) retval = lowest_latency; break; case bulk_latency: /* 250 usec aka 4000 ints/s */ if (bytes > 25000) { if (packets > 35) retval = low_latency; - } else { - if (bytes < 6000) - retval = low_latency; + } else if (bytes < 6000) { + retval = low_latency; } break; } @@ -2679,17 +2684,20 @@ static void e1000_set_itr(struct e1000_adapter *adapter) adapter->tx_itr, adapter->total_tx_packets, adapter->total_tx_bytes); + /* conservative mode (itr 3) eliminates the lowest_latency setting */ + if (adapter->itr_setting == 3 && adapter->tx_itr == lowest_latency) + adapter->tx_itr = low_latency; + adapter->rx_itr = e1000_update_itr(adapter, adapter->rx_itr, adapter->total_rx_packets, adapter->total_rx_bytes); + /* conservative mode (itr 3) eliminates the lowest_latency setting */ + if (adapter->itr_setting == 3 && adapter->rx_itr == lowest_latency) + adapter->rx_itr = low_latency; current_itr = max(adapter->rx_itr, adapter->tx_itr); - /* conservative mode eliminates the lowest_latency setting */ - if (current_itr == lowest_latency && (adapter->itr_setting == 3)) - current_itr = low_latency; - switch (current_itr) { /* counts and packets in update_itr are dependent on these numbers */ case lowest_latency: @@ -3868,11 +3876,11 @@ e1000_clean_tx_irq(struct e1000_adapter *adapter, cleaned = (i == eop); if (cleaned) { - /* this packet count is wrong for TSO but has a - * tendency to make dynamic ITR change more - * towards bulk */ + struct sk_buff *skb = buffer_info->skb; + unsigned int segs = skb_shinfo(skb)->gso_segs; + total_tx_packets += segs; total_tx_packets++; - total_tx_bytes += buffer_info->skb->len; + total_tx_bytes += skb->len; } e1000_unmap_and_free_tx_resource(adapter, buffer_info); tx_desc->upper.data = 0; -- cgit v1.2.3-70-g09d2