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Commit 417a3ae4 authored by Igor Russkikh's avatar Igor Russkikh Committed by David S. Miller
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net: aquantia: Bad udp rate on default interrupt coalescing 



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: default avatarPavel Belous <pavel.belous@aquantia.com>
Signed-off-by: default avatarIgor Russkikh <igor.russkikh@aquantia.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent b82ee71a

drivers/net/ethernet/aquantia/atlantic/hw_atl/hw_atl_b0.c

+6 −6
Original line number Original line Diff line number Diff line
@@ -821,12 +821,12 @@ static int hw_atl_b0_hw_interrupt_moderation_set(struct aq_hw_s *self) 
			itr_rx |= rx_max_timer << 0x10U;

			itr_rx |= rx_max_timer << 0x10U;

		} else {

		} else {

			static unsigned int hw_atl_b0_timers_table_tx_[][2] = {

			static unsigned int hw_atl_b0_timers_table_tx_[][2] = {

				{0xffU, 0xffU}, /* 10Gbit */

				{0xfU, 0xffU}, /* 10Gbit */

				{0xffU, 0x1ffU}, /* 5Gbit */

				{0xfU, 0x1ffU}, /* 5Gbit */

				{0xffU, 0x1ffU}, /* 5Gbit 5GS */

				{0xfU, 0x1ffU}, /* 5Gbit 5GS */

				{0xffU, 0x1ffU}, /* 2.5Gbit */

				{0xfU, 0x1ffU}, /* 2.5Gbit */

				{0xffU, 0x1ffU}, /* 1Gbit */

				{0xfU, 0x1ffU}, /* 1Gbit */

				{0xffU, 0x1ffU}, /* 100Mbit */

				{0xfU, 0x1ffU}, /* 100Mbit */

			};

			};





			static unsigned int hw_atl_b0_timers_table_rx_[][2] = {

			static unsigned int hw_atl_b0_timers_table_rx_[][2] = {