From f494e8faa77bd4147324f7666441e0b780e7db94 Mon Sep 17 00:00:00 2001 From: Ayyappan Veeraiyan Date: Mon, 3 Mar 2008 15:03:57 -0800 Subject: ixgbe: Introduce adaptive interrupt moderation 82598 can produce a formidable interrupt rate, and is largely unusable without some form of moderation. The default behaviour before this patch is to limit irq's to a reasonable number. However, just like our other drivers we can reduce latency for small packet-type traffic considerably by allowing the irq rate to go up dynamically. This patch introduces a simple irq moderation algorithm based on traffic analysis. The driver will use more CPU to service small packets quicker but will perform the same on bulk traffic as the old code. Signed-off-by: Ayyappan Veeraiyan Signed-off-by: Auke Kok Signed-off-by: Jeff Garzik --- drivers/net/ixgbe/ixgbe.h | 9 +++++++++ 1 file changed, 9 insertions(+) (limited to 'drivers/net/ixgbe/ixgbe.h') diff --git a/drivers/net/ixgbe/ixgbe.h b/drivers/net/ixgbe/ixgbe.h index 20774772b608..79f5519e2aa9 100644 --- a/drivers/net/ixgbe/ixgbe.h +++ b/drivers/net/ixgbe/ixgbe.h @@ -136,6 +136,8 @@ struct ixgbe_ring { u16 head; u16 tail; + unsigned int total_bytes; + unsigned int total_packets; u16 reg_idx; /* holds the special value that gets the hardware register * offset associated with this ring, which is different @@ -174,6 +176,8 @@ struct ixgbe_q_vector { DECLARE_BITMAP(txr_idx, MAX_TX_QUEUES); /* Tx ring indices */ u8 rxr_count; /* Rx ring count assigned to this vector */ u8 txr_count; /* Tx ring count assigned to this vector */ + u8 tx_eitr; + u8 rx_eitr; u32 eitr; }; @@ -215,6 +219,11 @@ struct ixgbe_adapter { struct ixgbe_q_vector q_vector[MAX_MSIX_Q_VECTORS]; char name[MAX_MSIX_COUNT][IFNAMSIZ + 5]; + /* Interrupt Throttle Rate */ + u32 itr_setting; + u16 eitr_low; + u16 eitr_high; + /* TX */ struct ixgbe_ring *tx_ring; /* One per active queue */ u64 restart_queue; -- cgit v1.2.3