netdev - Re: [PATCH v2 net-next] mlx4: optimize xmit path

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Date:	Thu, 2 Oct 2014 11:57:33 +0300
From:	Amir Vadai <amirv@...lanox.com>
To:	Jesper Dangaard Brouer <brouer@...hat.com>
CC:	Eric Dumazet <eric.dumazet@...il.com>,
	Or Gerlitz <gerlitz.or@...il.com>,
	Alexei Starovoitov <ast@...mgrid.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	John Fastabend <john.r.fastabend@...el.com>,
	Linux Netdev List <netdev@...r.kernel.org>,
	"Or Gerlitz" <or.gerlitz@...il.com>, <amira@...lanox.com>,
	<idos@...lanox.com>, Yevgeny Petrilin <yevgenyp@...lanox.com>,
	<eyalpe@...lanox.com>
Subject: Re: [PATCH v2 net-next] mlx4: optimize xmit path

On 10/2/2014 11:29 AM, Jesper Dangaard Brouer wrote:
> On Thu, 2 Oct 2014 11:03:13 +0300
> Amir Vadai <amirv@...lanox.com> wrote:
> 
>> I'm still working on it, but I can't reproduce the numbers that you
>> show. On my development machine, I get ~5.5Mpps with burst=8 and ~2Mpps
>> with burst=1.
> 
> For pktgen it sounds like you either missing:
> 
> 1) flag QUEUE_MAP_CPU

>  and/or
> 2) clone_skb $BIGNUMBER
Thanks,

This improved the numbers to ~7Mpps with burst=8 and ~4Mpps with burst=1
- still far away from 15Mpps, but in the direction.

> 
> My usage of pktgen:
>  http://netoptimizer.blogspot.dk/2014/06/pktgen-for-network-overload-testing.html
> 

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