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diff --git a/sys/dev/ixgbe/if_ix.c b/sys/dev/ixgbe/if_ix.c
--- a/sys/dev/ixgbe/if_ix.c
+++ b/sys/dev/ixgbe/if_ix.c
@@ -347,6 +347,16 @@
SYSCTL_INT(_hw_ix, OID_AUTO, enable_rss, CTLFLAG_RDTUN, &ixgbe_enable_rss, 0,
"Enable Receive-Side Scaling (RSS)");
+/*
+ * AIM: Adaptive Interrupt Moderation
+ * which means that the interrupt rate
+ * is varied over time based on the
+ * traffic for that interrupt vector
+ */
+static int ixgbe_enable_aim = FALSE;
+SYSCTL_INT(_hw_ix, OID_AUTO, enable_aim, CTLFLAG_RWTUN, &ixgbe_enable_aim, 0,
+ "Enable adaptive interrupt moderation");
+
#if 0
/* Keep running tab on them for sanity check */
static int ixgbe_total_ports;
@@ -2100,6 +2110,60 @@
return (error);
} /* ixgbe_if_msix_intr_assign */
+static inline void
+ixgbe_perform_aim(struct adapter *adapter, struct ix_rx_queue *que)
+{
+ uint32_t newitr = 0;
+ struct rx_ring *rxr = &que->rxr;
+
+ /*
+ * Do Adaptive Interrupt Moderation:
+ * - Write out last calculated setting
+ * - Calculate based on average size over
+ * the last interval.
+ */
+ if (que->eitr_setting) {
+ IXGBE_WRITE_REG(&adapter->hw, IXGBE_EITR(que->msix),
+ que->eitr_setting);
+ }
+
+ que->eitr_setting = 0;
+ /* Idle, do nothing */
+ if (rxr->bytes == 0) {
+ return;
+ }
+
+ if ((rxr->bytes) && (rxr->packets)) {
+ newitr = (rxr->bytes / rxr->packets);
+ }
+
+ newitr += 24; /* account for hardware frame, crc */
+ /* set an upper boundary */
+ newitr = min(newitr, 3000);
+
+ /* Be nice to the mid range */
+ if ((newitr > 300) && (newitr < 1200)) {
+ newitr = (newitr / 3);
+ } else {
+ newitr = (newitr / 2);
+ }
+
+ if (adapter->hw.mac.type == ixgbe_mac_82598EB) {
+ newitr |= newitr << 16;
+ } else {
+ newitr |= IXGBE_EITR_CNT_WDIS;
+ }
+
+ /* save for next interrupt */
+ que->eitr_setting = newitr;
+
+ /* Reset state */
+ rxr->bytes = 0;
+ rxr->packets = 0;
+
+ return;
+}
+
/*********************************************************************
* ixgbe_msix_que - MSI-X Queue Interrupt Service routine
**********************************************************************/
@@ -2117,6 +2181,11 @@
ixgbe_disable_queue(adapter, que->msix);
++que->irqs;
+ /* Check for AIM */
+ if (adapter->enable_aim) {
+ ixgbe_perform_aim(adapter, que);
+ }
+
return (FILTER_SCHEDULE_THREAD);
} /* ixgbe_msix_que */
@@ -2575,6 +2644,10 @@
adapter, 0, ixgbe_sysctl_advertise, "I",
IXGBE_SYSCTL_DESC_ADV_SPEED);
+ adapter->enable_aim = ixgbe_enable_aim;
+ SYSCTL_ADD_INT(ctx_list, child, OID_AUTO, "enable_aim", CTLFLAG_RW,
+ &adapter->enable_aim, 0, "Interrupt Moderation");
+
#ifdef IXGBE_DEBUG
/* testing sysctls (for all devices) */
SYSCTL_ADD_PROC(ctx_list, child, OID_AUTO, "power_state",
diff --git a/sys/dev/ixgbe/ixgbe.h b/sys/dev/ixgbe/ixgbe.h
--- a/sys/dev/ixgbe/ixgbe.h
+++ b/sys/dev/ixgbe/ixgbe.h
@@ -408,6 +408,7 @@
/* Info about the interface */
int advertise; /* link speeds */
+ int enable_aim; /* adaptive interrupt moderation */
bool link_active;
u16 num_segs;
u32 link_speed;

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