netdev - Re: [RFC PATCH net-next] net: pktgen: packet bursting via skb->xmit

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Message-ID: <1411717322.16953.99.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Fri, 26 Sep 2014 00:42:02 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Alexei Starovoitov <ast@...mgrid.com>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Jesper Dangaard Brouer <brouer@...hat.com>,
	Eric Dumazet <edumazet@...gle.com>,
	John Fastabend <john.r.fastabend@...el.com>,
	netdev@...r.kernel.org
Subject: Re: [RFC PATCH net-next] net: pktgen: packet bursting via
 skb->xmit_more

On Thu, 2014-09-25 at 18:20 -0700, Eric Dumazet wrote:
> On Thu, 2014-09-25 at 17:46 -0700, Alexei Starovoitov wrote:
> > This patch demonstrates the effect of delaying update of HW tailptr.
> > (based on earlier patch by Jesper)
> > 
> > burst=1 is a default. It sends one packet with xmit_more=false
> > burst=2 sends one packet with xmit_more=true and
> >         2nd copy of the same packet with xmit_more=false
> > burst=3 sends two copies of the same packet with xmit_more=true and
> >         3rd copy with xmit_more=false
> 
> > 
> > Cc: Jesper Dangaard Brouer <brouer@...hat.com>
> > Signed-off-by: Alexei Starovoitov <ast@...mgrid.com>
> > ---
> 
> Perfect, this is what I had in mind, thanks !
> 
> Acked-by: Eric Dumazet <edumazet@...gle.com>
> 

By the way with this patch, I now reach 10 Mpps on mlx4 

base line : 5 Mpps

+ skb->xmit_more and quick hack in pjtgen (spinlock/unlock per packet)
-> 7 Mpps

+ burst of 16 packets, no spinlock per packet -> 10 Mpps



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