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net/mlx5e: set the tx_queue_len for pfifo_fast

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[ Upstream commit a38cc5706fb9f7dc4ee3a443f61de13ce1e410ed ]

By default, the mq netdev creates a pfifo_fast qdisc. On a
system with 16 core, the pfifo_fast with 3 bands consumes
16 * 3 * 8 (size of pointer) * 1024 (default tx queue len)
= 393KB. The patch sets the tx qlen to representor default
value, 128 (1<<MLX5E_REP_PARAMS_DEF_LOG_SQ_SIZE), which
consumes 16 * 3 * 8 * 128 = 49KB, saving 344KB for each
representor at ECPF.

Signed-off-by: William Tu <witu@nvidia.com>
Reviewed-by: Daniel Jurgens <danielj@nvidia.com>
Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
Reviewed-by: Michal Swiatkowski <michal.swiatkowski@linux.intel.com>
Link: https://patch.msgid.link/20250209101716.112774-9-tariqt@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
William Tu 2025-02-09 12:17:09 +02:00 • committed by Greg Kroah-Hartman
commit 7df118ff51
1 changed files with 2 additions and 0 deletions
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2
drivers/net/ethernet/mellanox/mlx5/core/en_rep.c
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@ -1470,6 +1470,8 @@ static void mlx5e_build_rep_netdev(struct net_device *netdev)
}
netdev->watchdog_timeo = 15 * HZ;
if (mlx5_core_is_ecpf(mdev))
netdev->tx_queue_len = 1 << MLX5E_REP_PARAMS_DEF_LOG_SQ_SIZE;
netdev->features |= NETIF_F_NETNS_LOCAL;