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
doorbells, qdisc requeues and reschedules.
This patch series :
- Add __netdev_tx_sent_queue() 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()
- changes mlx4 to use __netdev_tx_sent_queue()
v2: Tariq and Willem feedback addressed.
added __netdev_tx_sent_queue() (Willem suggestion)
Eric Dumazet (3):
net: bql: add __netdev_tx_sent_queue()
net: do not abort bulk send on BQL status
net/mlx4_en: use __netdev_tx_sent_queue()
drivers/net/ethernet/mellanox/mlx4/en_tx.c | 6 ++++--
include/linux/netdevice.h | 20 ++++++++++++++++++++
net/core/dev.c | 2 +-
3 files changed, 25 insertions(+), 3 deletions(-)
--
2.19.1.930.g4563a0d9d0-goog
