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ixgbevf: Limit lowest interrupt rate for adaptive interrupt moderation to 12K 

This patch is the ixgbevf version of commit 8ac34f10a5 "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 <aduyck@mirantis.com>
Tested-by: Darin Miller <darin.j.miller@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Alexander Duyck 2015-09-29 13:11:15 -07:00 committed by Jeff Kirsher
parent d91e3a7d62
commit 8a9ca1104d
3 changed files with 5 additions and 6 deletions
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2
drivers/net/ethernet/intel/ixgbevf/ethtool.c
View File

@ -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;

3
drivers/net/ethernet/intel/ixgbevf/ixgbevf.h
View File

@ -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

6
drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
View File

@ -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;
}