Ok, thanks guys. I don't think I'll proceed with this idea. Thanks Sassan
On 26 July 2011 11:23, Hannes Reinecke <h...@suse.de> wrote: > On 07/26/2011 08:04 AM, Stefan Hajnoczi wrote: > >> On Mon, Jul 25, 2011 at 4:53 PM, Sassan >> Panahinejad<sas...@sassan.me.**uk<sas...@sassan.me.uk>> >> wrote: >> >>> Here's a thought, could we improve network performance by creating a >>> paravirtual network device which doesn't emulate ethernet? It shouldn't >>> be >>> too hard to just whack IP packets pretty much directly over a virtio >>> link. >>> This should improve performance when using a "user" host connection and >>> we >>> could introduce a tun host connection instead of tap for this setup. >>> >>> Does anyone have any thoughts on how worthwhile this would be? Would the >>> performance improvement justify the effort involved? >>> >> >> My guess is no noticable impact (if you ignore ARP requests). >> >> The Ethernet header is only 14 bytes or so. We don't calculate any >> checksums at that level. There's probably not much of a win. >> >> Only lots of pain to be had. > Mainframe used to do this. But abandoned it not, thankfully. > > Problem is that you need to patch each and every tool looking at the > packets to _not_ expecting an Ethernet header. > And patching up DHCP is _not_ trivial. > > Cheers, > > Hannes > -- > Dr. Hannes Reinecke zSeries & Storage > h...@suse.de +49 911 74053 688 > SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg > GF: J. Hawn, J. Guild, F. Imendörffer, HRB 16746 (AG Nürnberg) > >
