svn commit: r341578 - head/sys/dev/mlx5/mlx5_en

[Andrey V. Elsukov]

On 05.12.2018 17:20, Slava Shwartsman wrote:
> Author: slavash
> Date: Wed Dec  5 14:20:57 2018
> New Revision: 341578
> URL: https://svnweb.freebsd.org/changeset/base/341578
> 
> Log:
>   mlx5en: Remove the DRBR and associated logic in the transmit path.
>   
>   The hardware queues are deep enough currently and using the DRBR and associated
>   callbacks only leads to more task switching in the TX path. The is also a race
>   setting the queue_state which can lead to hung TX rings.

JFYI. We have compared the same router+firewall workloads on the host
with this change and before, and I can say, that without DRBR on TX now
we constantly have several percents of packets drops due to ENOBUFS
error from mlx5e_xmit().

-- 
WBR, Andrey V. Elsukov

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