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Re: [PATCH] Virtual ethernet device (v2.1) [message #14817 is a reply to message #14814] Wed, 11 July 2007 09:44 Go to previous messageGo to previous message
Evgeniy Polyakov is currently offline  Evgeniy Polyakov
Messages: 11
Registered: November 2006
Junior Member
Hi.

On Wed, Jul 11, 2007 at 01:31:15PM +0400, Pavel Emelianov (xemul@openvz.org) wrote:
> Veth stands for Virtual ETHernet. It is a simple tunnel driver
> that works at the link layer and looks like a pair of ethernet
> devices interconnected with each other.
>
> Mainly it allows to communicate between network namespaces but
> it can be used as is as well.

I have minor comment about flags used in veth. It looks like you only
set LLTX bit, but check for other flags in the code, so why not to
include another performance features?

> +static void veth_setup(struct net_device *dev)
> +{
> + ether_setup(dev);
> +
> + dev->hard_start_xmit = veth_xmit;
> + dev->get_stats = veth_get_stats;
> + dev->open = veth_open;
> + dev->stop = veth_close;
> + dev->ethtool_ops = &veth_ethtool_ops;
> + dev->features |= NETIF_F_LLTX;
> + dev->init = veth_dev_init;
> + dev->destructor = veth_dev_free;
> + netif_carrier_off(dev);
> +}

Don't you want to include NETIF_F_SG, NETIF_F_NO_CSUM, NETIF_F_FRAGLIST,
NETIF_F_HIGHDMA and probably TSO fancy flags also to reduce cpu usage more?

--
Evgeniy Polyakov

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