On Tue, Oct 24, 2017 at 05:27:25PM -0700, Yongseok Koh wrote:
> Configuring UAR as IO-mapped makes maximum throughput decline by noticeable
> amount. If UAR is configured as write-combining register, a write memory
> barrier is needed on ringing a doorbell. rte_wmb() is mostly effective when
> the size of a burst is comparatively small. Revert the register back to
> write-combining and enforce a write memory barrier instead, except for
> vectorized Tx burst routines. Application can change it by setting
> MLX5_SHUT_UP_BF under its own necessity.
>
> Fixes: 9f9bebae5530 ("net/mlx5: don't map doorbell register to write
> combining")
> Cc: sta...@dpdk.org
> Cc: Sagi Grimberg <s...@grimberg.me>
> Cc: Alexander Solganik <solga...@gmail.com>
>
> Signed-off-by: Yongseok Koh <ys...@mellanox.com>
> Acked-by: Shahaf Shuler <shah...@mellanox.com>
Acked-by: Nelio Laranjeiro <nelio.laranje...@6wind.com>
Thanks,
--
Nélio Laranjeiro
6WIND
