net/ixgbevf: set the interrupt interval for EITR

Set EITR interval as default. This patch can improve the
performance when we enable the rx-interrupt to process the
packets because we hope rx-interrupt reduce CPU. For example,
the 200us value of EITR makes the performance better with
the low CPU. The default value of ITR is 500us, compatible
with RSC of ixgbe PF, and next patch will use the default value.

Signed-off-by: Tonghao Zhang <xiangxia.m.yue@gmail.com>
Acked-by: Qi Zhang <qi.z.zhang@intel.com>

diff --git a/drivers/net/ixgbe/ixgbe_ethdev.c b/drivers/net/ixgbe/ixgbe_ethdev.c
index 72fc02d..7ba05c4 100644 (file)
--- a/drivers/net/ixgbe/ixgbe_ethdev.c
+++ b/drivers/net/ixgbe/ixgbe_ethdev.c
@@ -5797,6 +5797,13 @@ ixgbevf_configure_msix(struct rte_eth_dev *dev)
                if (vector_idx < base + intr_handle->nb_efd - 1)
                        vector_idx++;
        }
+
+       /* As RX queue setting above show, all queues use the vector 0.
+        * Set only the ITR value of IXGBE_MISC_VEC_ID.
+        */
+       IXGBE_WRITE_REG(hw, IXGBE_VTEITR(IXGBE_MISC_VEC_ID),
+                       IXGBE_EITR_INTERVAL_US(IXGBE_QUEUE_ITR_INTERVAL_DEFAULT)
+                       | IXGBE_EITR_CNT_WDIS);
 }
 
 /**

diff --git a/drivers/net/ixgbe/ixgbe_ethdev.h b/drivers/net/ixgbe/ixgbe_ethdev.h
index cc512d6..e42ec30 100644 (file)
--- a/drivers/net/ixgbe/ixgbe_ethdev.h
+++ b/drivers/net/ixgbe/ixgbe_ethdev.h
@@ -62,6 +62,7 @@
        (((us) * 1000 / IXGBE_EITR_INTERVAL_UNIT_NS << IXGBE_EITR_ITR_INT_SHIFT) & \
                IXGBE_EITR_ITR_INT_MASK)
 
+#define IXGBE_QUEUE_ITR_INTERVAL_DEFAULT       500 /* 500us */
 
 /* Loopback operation modes */
 /* 82599 specific loopback operation types */