Michael Tokarev wrote:
Right now (2.6.27), there's no way to change MTU of a
virtio-net interface, since the mtu-changing method is
not provided. Is there a simple way to add such a
beast?
It should be a nice easy patch for mtu < 4k.
You can just implement a 'change_mtu' handler like:
static int virtio_change_mtu(struct net_device *netdev, int new_mtu)
{
if(new_mtu < ETH_ZLEN || new_mtu > PAGE_SIZE)
return -EINVAL;
netdev->mtu = new_mtu;
return 0;
}
I'm asking because I'm not familiar with the internals,
and because, I think, increasing MTU (so that the
resulting skb still fits in a single page) will increase
performance significantly, at least on a internal/virtual
network -- currently there are just way too many context
switches and the like while copying data from one guest
to another or between guest and host.
Thanks!
/mjt
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