netdev - Re: [WIP] net+mlx4: auto doorbell

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Message-ID: <1480526910.18162.193.camel@edumazet-glaptop3.roam.corp.google.com>
Date:   Wed, 30 Nov 2016 09:28:30 -0800
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Saeed Mahameed <saeedm@....mellanox.co.il>
Cc:     Jesper Dangaard Brouer <brouer@...hat.com>,
        Rick Jones <rick.jones2@....com>,
        Linux Netdev List <netdev@...r.kernel.org>,
        Saeed Mahameed <saeedm@...lanox.com>,
        Tariq Toukan <tariqt@...lanox.com>
Subject: Re: [WIP] net+mlx4: auto doorbell

On Wed, 2016-11-30 at 18:27 +0200, Saeed Mahameed wrote:

> 
> In this case, i think they should implement their own bulking (pktgen
> is not a good example)
> but XDP can predict if it has more packets to xmit  as long as all of
> them fall in the same NAPI cycle.


> Others should try and do the same.

We can not trust user space to signal us when it is the good time to
perform a doorbell.

trafgen is using af_packet with qdisc bypass for example.