netdev - [PATCH net 0/3] net: bql: better deal with GSO

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Message-Id: <20181029232539.217268-1-edumazet@google.com>
Date:   Mon, 29 Oct 2018 16:25:36 -0700
From:   Eric Dumazet <edumazet@...gle.com>
To:     "David S . Miller" <davem@...emloft.net>
Cc:     netdev <netdev@...r.kernel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        Willem de Bruijn <willemb@...gle.com>,
        Tariq Toukan <tariqt@...lanox.com>,
        Eric Dumazet <eric.dumazet@...il.com>
Subject: [PATCH net 0/3] net: bql: better deal with GSO

While BQL bulk dequeue works well for TSO packets, it is
not very efficient as soon as GSO is involved.

On a GSO only workload (UDP or TCP), this patch series
can save about 8 % of cpu cycles on a 40Gbit mlx4 NIC,
by keeping optimal batching, and avoiding expensive
qdisc requeues and reschedules.

This patch series :

- Add netdev_tx_sent_queue_more() so that drivers
  can implement efficient BQL and xmit_more support.

- Implement a work around in dev_hard_start_xmit()
  for drivers not using netdev_tx_sent_queue_more()

- changes mlx4 to use netdev_tx_sent_queue_more()

Eric Dumazet (3):
  net: bql: add netdev_tx_sent_queue_more() helper
  net: do not abort bulk send on BQL status
  net/mlx4_en: use netdev_tx_sent_queue_more()

 drivers/net/ethernet/mellanox/mlx4/en_tx.c | 10 ++++++++--
 include/linux/netdevice.h                  | 12 ++++++++++++
 net/core/dev.c                             |  2 +-
 3 files changed, 21 insertions(+), 3 deletions(-)

-- 
2.19.1.568.g152ad8e336-goog