[PATCH 1/9] net: aquantia: Bad udp rate on default interrupt coalescing

[AceLan Kao]

From: Igor Russkikh <igor.russkikh at aquantia.com>

BugLink: http://bugs.launchpad.net/bugs/1730544

Default Tx rates cause very long ISR delays on Tx.
0xff is 510us delay, giving only ~ 2000 interrupts per seconds for
Tx rings cleanup. With these settings udp tx rate was never higher than
~800Mbps on a single stream. Changing min delay to 0xF makes it
way better with ~6Gbps

TCP stream performance is almost unaffected by this change, since LSO
optimizations play important role.

CPU load is affected insignificantly by this change.

Signed-off-by: Pavel Belous <pavel.belous at aquantia.com>
Signed-off-by: Igor Russkikh <igor.russkikh at aquantia.com>
Signed-off-by: David S. Miller <davem at davemloft.net>
(cherry picked from commit 417a3ae4b14909439bb49790f90201f450399845)
Signed-off-by: AceLan Kao <acelan.kao at canonical.com>
---
 drivers/net/ethernet/aquantia/atlantic/hw_atl/hw_atl_b0.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/net/ethernet/aquantia/atlantic/hw_atl/hw_atl_b0.c b/drivers/net/ethernet/aquantia/atlantic/hw_atl/hw_atl_b0.c
index 21784cc..a399203 100644
--- a/drivers/net/ethernet/aquantia/atlantic/hw_atl/hw_atl_b0.c
+++ b/drivers/net/ethernet/aquantia/atlantic/hw_atl/hw_atl_b0.c
@@ -815,12 +815,12 @@ static int hw_atl_b0_hw_interrupt_moderation_set(struct aq_hw_s *self,
 			PHAL_ATLANTIC_B0->itr_rx |= max_timer << 0x10U;
 		} else {
 			static unsigned int hw_atl_b0_timers_table_tx_[][2] = {
-				{0xffU, 0xffU}, /* 10Gbit */
-				{0xffU, 0x1ffU}, /* 5Gbit */
-				{0xffU, 0x1ffU}, /* 5Gbit 5GS */
-				{0xffU, 0x1ffU}, /* 2.5Gbit */
-				{0xffU, 0x1ffU}, /* 1Gbit */
-				{0xffU, 0x1ffU}, /* 100Mbit */
+				{0xfU, 0xffU}, /* 10Gbit */
+				{0xfU, 0x1ffU}, /* 5Gbit */
+				{0xfU, 0x1ffU}, /* 5Gbit 5GS */
+				{0xfU, 0x1ffU}, /* 2.5Gbit */
+				{0xfU, 0x1ffU}, /* 1Gbit */
+				{0xfU, 0x1ffU}, /* 100Mbit */
 			};
 
 			static unsigned int hw_atl_b0_timers_table_rx_[][2] = {
-- 
2.7.4