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Date:	Sat, 27 Sep 2014 23:59:24 +0300
From:	Or Gerlitz <>
To:	Alexei Starovoitov <>,
	Eric Dumazet <>
Cc:	"David S. Miller" <>,
	Jesper Dangaard Brouer <>,
	John Fastabend <>,
	Linux Netdev List <>
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 <> 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 <>
> Signed-off-by: Alexei Starovoitov <>
> ---
> 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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