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

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Message-ID: <CAJ3xEMi9WRLOJuyFpc1rJtW5BHSsW=foy-PvR-L5B4q-XWAHCA@mail.gmail.com>
Date:	Sat, 27 Sep 2014 23:59:24 +0300
From:	Or Gerlitz <gerlitz.or@...il.com>
To:	Alexei Starovoitov <ast@...mgrid.com>,
	Eric Dumazet <edumazet@...gle.com>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Jesper Dangaard Brouer <brouer@...hat.com>,
	John Fastabend <john.r.fastabend@...el.com>,
	Linux Netdev List <netdev@...r.kernel.org>
Subject: Re: [RFC PATCH net-next] net: pktgen: packet bursting via skb->xmit_more

On Fri, Sep 26, 2014 at 3:46 AM, Alexei Starovoitov <ast@...mgrid.com> 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


Guys, just to be sure, this pktgen config uses only one TX ring, right?


> Performance with ixgbe:
>
> usec 30:
> burst=1  tx:9.2 Mpps
> burst=2  tx:13.6 Mpps
> burst=3  tx:14.5 Mpps full 10G line rate
>
> usec 1 (default):
> burst=1,4,100 tx:3.9 Mpps
>
> usec 0:
> burst=1  tx:4.9 Mpps
> burst=2  tx:6.6 Mpps
> burst=3  tx:7.9 Mpps
> burst=4  tx:8.7 Mpps
> burst=8  tx:10.3 Mpps
> burst=128  tx:12.4 Mpps
>
> Cc: Jesper Dangaard Brouer <brouer@...hat.com>
> Signed-off-by: Alexei Starovoitov <ast@...mgrid.com>
> ---
>
> tx queue size, irq affinity left in default.
> pause frames are off.
>
> Nice to finally see line rate generated by one cpu
>
> Comparing to Jesper patch this one amortizes the cost
> of spin_lock and atomic_inc by doing HARD_TX_LOCK and
> atomic_add(N) once across N packets.
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