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

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Date:   Thu, 01 Dec 2016 12:11:26 -0800
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Jesper Dangaard Brouer <brouer@...hat.com>
Cc:     Saeed Mahameed <saeedm@....mellanox.co.il>,
        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 Thu, 2016-12-01 at 20:17 +0100, Jesper Dangaard Brouer wrote:
> On Thu, 01 Dec 2016 09:04:17 -0800 Eric Dumazet <eric.dumazet@...il.com> wrote:
> 
> > BTW, if you are doing tests on mlx4 40Gbit,
> 
> I'm mostly testing with mlx5 50Gbit, but I do have 40G NIC in the
> machines too.
> 
> >  would you check the
> > following quick/dirty hack, using lots of low-rate flows ?
> 
> What tool should I use to send "low-rate flows"?
> 

You could use https://github.com/google/neper

It supports SO_MAX_PACING_RATE, and you could launch 1600 flows, rate
limited to 3028000 bytes per second  (so sending one 2-MSS TSO packet
every ms per flow)



> And what am I looking for?

Max throughput, in packets per second :/