It is time to have preemption points in sk_busy_loop() and improve its scalability.
Also napi_complete() and friends can tell drivers when it is safe to not re-enable device interrupts, saving some overhead under high busy polling. mlx4 and bnx2x are changed accordingly, to show how this busy polling status can be exploited by drivers. Next steps will implement Zach Brown suggestion, where NAPI polling would be enabled all the time for some chosen queues. This is needed for efficient epoll() support anyway. Eric Dumazet (5): net: busy-poll: allow preemption in sk_busy_loop() net: busy-poll: remove need_resched() from sk_can_busy_loop() net: busy-poll: return busypolling status to drivers net/mlx4_en: use napi_complete_done() return value bnx2x: switch to napi_complete_done() drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c | 15 ++-- drivers/net/ethernet/mellanox/mlx4/en_rx.c | 4 +- include/linux/netdevice.h | 17 +++- include/net/busy_poll.h | 5 +- net/core/dev.c | 110 +++++++++++++++++++----- 5 files changed, 113 insertions(+), 38 deletions(-) -- 2.8.0.rc3.226.g39d4020
