netdev - Re: [PATCH net-next v3 2/2] net/mlx5e: use indirect calls wrapper for the rx packet handler

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Message-ID: <ad481203aabc0c3a5b8e93258711a081b1d799cb.camel@mellanox.com>
Date:   Fri, 14 Jun 2019 18:42:08 +0000
From:   Saeed Mahameed <saeedm@...lanox.com>
To:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "pabeni@...hat.com" <pabeni@...hat.com>
CC:     "davem@...emloft.net" <davem@...emloft.net>,
        "leon@...nel.org" <leon@...nel.org>
Subject: Re: [PATCH net-next v3 2/2] net/mlx5e: use indirect calls wrapper for
 the rx packet handler

On Wed, 2019-06-12 at 12:18 +0200, Paolo Abeni wrote:
> We can avoid another indirect call per packet wrapping the rx
> handler call with the proper helper.
> 
> To ensure that even the last listed direct call experience
> measurable gain, despite the additional conditionals we must
> traverse before reaching it, I tested reversing the order of the
> listed options, with performance differences below noise level.
> 
> Together with the previous indirect call patch, this gives
> ~6% performance improvement in raw UDP tput.
> 
> v2 -> v3:
>  - use only the direct calls always available regardless of
>    the mlx5 build options
>  - drop the direct call list macro, to keep the code as simple
>    as possible for future rework
> 
> v1 -> v2:
>  - update the direct call list and use a macro to define it,
>    as per Saeed suggestion. An intermediated additional
>    macro is needed to allow arg list expansion
> 
> Signed-off-by: Paolo Abeni <pabeni@...hat.com>
> 

Acked-by: Saeed Mahameed <saeedm@...lanox.com>