netdev - Re: [PATCH net-next 2/4] sunvnet: make transmit path zero-copy in the kernel

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Message-Id: <20140929.145815.1751251065603753225.davem@davemloft.net>
Date:	Mon, 29 Sep 2014 14:58:15 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	david.stevens@...cle.com
Cc:	netdev@...r.kernel.org, sowmini.varadhan@...cle.com,
	Raghuram.Kothakota@...cle.com
Subject: Re: [PATCH net-next 2/4] sunvnet: make transmit path zero-copy in
 the kernel

From: David L Stevens <david.stevens@...cle.com>
Date: Mon, 29 Sep 2014 13:16:55 -0400

> This patch removes pre-allocated transmit buffers and instead directly maps
> pending packets on demand. This saves O(n^2) maximum-sized transmit buffers,
> for n hosts on a vswitch, as well as a copy to those buffers.
> 
> Single-stream TCP throughput linux-solaris dropped ~5% for 1500-byte MTU,
> but linux-linux at 1500-bytes increased ~20%.
> 
> Signed-off-by: David L Stevens <david.stevens@...cle.com>

Awesome!!!

However:

>  	dr->ncookies = ncookies;
>  +	for (i = 0; i < VNET_TX_RING_SIZE; ++i) {
> +		struct vio_net_desc *d;
> 

I see a lot of this, I think your patch is corrupted.
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