netdev - Re: [PATCH net-next] mlx4: exploit skb->xmit_more to conditionally send doorbell

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Date:	Thu, 25 Sep 2014 08:53:30 -0700
From:	Alexei Starovoitov <alexei.starovoitov@...il.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	David Miller <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>, Amir Vadai <amirv@...lanox.com>
Subject: Re: [PATCH net-next] mlx4: exploit skb->xmit_more to conditionally
 send doorbell

On Thu, Sep 25, 2014 at 7:17 AM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> From: Eric Dumazet <edumazet@...gle.com>
>
> skb->xmit_more tells us if another skb is coming next.
>
> We need to send doorbell when : xmit_more is not set,
> or txqueue is stopped (preventing next skb to come immediately)
>
> Tested with a modified pktgen version, I got a 40% increase of
> throughput.

this is awesome!

I've been hacking pktgen as well based on Jesper's earlier patch,
but in slightly different way. Sounds like you already have working
pktgen with xmit_more. Do you mind sharing it? even rough patch
would be great.

Thanks
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