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: [email protected]
> Cc: Sagi Grimberg <[email protected]>
> Cc: Alexander Solganik <[email protected]>
>
> Signed-off-by: Yongseok Koh <[email protected]>
> Acked-by: Shahaf Shuler <[email protected]>
Acked-by: Nelio Laranjeiro <[email protected]>
Thanks,
--
Nélio Laranjeiro
6WIND
