From: Alexander Duyck <adu...@mirantis.com>
This patch is the ixgbevf version of commit 8ac34f10a5ea4 "ixgbe: Limit
lowest interrupt rate for adaptive interrupt moderation to 12K"
The same logic applies here as well as the same results since a netperf
test will starve for memory in the time from one Tx interrupt to the next.
As a result the ixgbevf driver underperformed when compared to vhost_net.
Signed-off-by: Alexander Duyck <adu...@mirantis.com>
Tested-by: Darin Miller <darin.j.mil...@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirs...@intel.com>
---
drivers/net/ethernet/intel/ixgbevf/ethtool.c | 2 +-
drivers/net/ethernet/intel/ixgbevf/ixgbevf.h | 3 +--
drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c | 6 +++---
3 files changed, 5 insertions(+), 6 deletions(-)
diff --git a/drivers/net/ethernet/intel/ixgbevf/ethtool.c
b/drivers/net/ethernet/intel/ixgbevf/ethtool.c
index d3e5f5b..c48aef6 100644
--- a/drivers/net/ethernet/intel/ixgbevf/ethtool.c
+++ b/drivers/net/ethernet/intel/ixgbevf/ethtool.c
@@ -774,7 +774,7 @@ static int ixgbevf_set_coalesce(struct net_device *netdev,
adapter->tx_itr_setting = ec->tx_coalesce_usecs;
if (adapter->tx_itr_setting == 1)
- tx_itr_param = IXGBE_10K_ITR;
+ tx_itr_param = IXGBE_12K_ITR;
else
tx_itr_param = adapter->tx_itr_setting;
diff --git a/drivers/net/ethernet/intel/ixgbevf/ixgbevf.h
b/drivers/net/ethernet/intel/ixgbevf/ixgbevf.h
index ec31472..68ec7daa 100644
--- a/drivers/net/ethernet/intel/ixgbevf/ixgbevf.h
+++ b/drivers/net/ethernet/intel/ixgbevf/ixgbevf.h
@@ -326,8 +326,7 @@ static inline bool ixgbevf_qv_disable(struct
ixgbevf_q_vector *q_vector)
#define IXGBE_MIN_RSC_ITR 24
#define IXGBE_100K_ITR 40
#define IXGBE_20K_ITR 200
-#define IXGBE_10K_ITR 400
-#define IXGBE_8K_ITR 500
+#define IXGBE_12K_ITR 336
/* Helper macros to switch between ints/sec and what the register uses.
* And yes, it's the same math going both ways. The lowest value
diff --git a/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
b/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
index 2955186..e678178 100644
--- a/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
+++ b/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
@@ -1138,7 +1138,7 @@ static void ixgbevf_configure_msix(struct ixgbevf_adapter
*adapter)
if (q_vector->tx.ring && !q_vector->rx.ring) {
/* Tx only vector */
if (adapter->tx_itr_setting == 1)
- q_vector->itr = IXGBE_10K_ITR;
+ q_vector->itr = IXGBE_12K_ITR;
else
q_vector->itr = adapter->tx_itr_setting;
} else {
@@ -1196,7 +1196,7 @@ static void ixgbevf_update_itr(struct ixgbevf_q_vector
*q_vector,
/* simple throttle rate management
* 0-20MB/s lowest (100000 ints/s)
* 20-100MB/s low (20000 ints/s)
- * 100-1249MB/s bulk (8000 ints/s)
+ * 100-1249MB/s bulk (12000 ints/s)
*/
/* what was last interrupt timeslice? */
timepassed_us = q_vector->itr >> 2;
@@ -1247,7 +1247,7 @@ static void ixgbevf_set_itr(struct ixgbevf_q_vector
*q_vector)
break;
case bulk_latency:
default:
- new_itr = IXGBE_8K_ITR;
+ new_itr = IXGBE_12K_ITR;
break;
}
--
2.5.0
--
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