netdev - [net-next V2 12/14] net/mlx5: DR, Lower sync threshold for ICM hot memory

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Date:   Thu, 27 Oct 2022 15:56:41 +0100
From:   Saeed Mahameed <saeed@...nel.org>
To:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Eric Dumazet <edumazet@...gle.com>
Cc:     Saeed Mahameed <saeedm@...dia.com>, netdev@...r.kernel.org,
        Tariq Toukan <tariqt@...dia.com>,
        Yevgeny Kliteynik <kliteyn@...dia.com>,
        Alex Vesker <valex@...dia.com>
Subject: [net-next V2 12/14] net/mlx5: DR, Lower sync threshold for ICM hot memory

From: Yevgeny Kliteynik <kliteyn@...dia.com>

Instead of hiding the math in the code, define a value that sets the
fraction of allowed hot memory of ICM pool.
Set the threshold for sync of ICM hot chunks to 1/4 of the pool
instead of 1/2 of the pool. Although we will have more syncs, each
sync will be shorter and will help with insertion rate stability.

Signed-off-by: Yevgeny Kliteynik <kliteyn@...dia.com>
Reviewed-by: Alex Vesker <valex@...dia.com>
Signed-off-by: Saeed Mahameed <saeedm@...dia.com>
---
 .../net/ethernet/mellanox/mlx5/core/steering/dr_icm_pool.c  | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/steering/dr_icm_pool.c b/drivers/net/ethernet/mellanox/mlx5/core/steering/dr_icm_pool.c
index ca91a0211a5c..286b7ce6bc0b 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/steering/dr_icm_pool.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/steering/dr_icm_pool.c
@@ -4,6 +4,7 @@
 #include "dr_types.h"
 
 #define DR_ICM_MODIFY_HDR_ALIGN_BASE 64
+#define DR_ICM_POOL_HOT_MEMORY_FRACTION 4
 
 struct mlx5dr_icm_pool {
 	enum mlx5dr_icm_type icm_type;
@@ -337,10 +338,11 @@ static bool dr_icm_pool_is_sync_required(struct mlx5dr_icm_pool *pool)
 {
 	int allow_hot_size;
 
-	/* sync when hot memory reaches half of the pool size */
+	/* sync when hot memory reaches a certain fraction of the pool size */
 	allow_hot_size =
 		mlx5dr_icm_pool_chunk_size_to_byte(pool->max_log_chunk_sz,
-						   pool->icm_type) / 2;
+						   pool->icm_type) /
+		DR_ICM_POOL_HOT_MEMORY_FRACTION;
 
 	return pool->hot_memory_size > allow_hot_size;
 }
-- 
2.37.3