On Wed, 2010-09-15 at 12:10 +0200, Michael S. Tsirkin wrote: > Another issue is that macvtap can be bound to almost > anything, including e.g. a tap device or a bridge, > which might hang on to skb fragments for unlimited time. > Zero copy TX won't easily work there. > I can imagine either somehow triggering a data copy after the > fact (hard), or detecting such devices and avoiding > zero copy (unfortunate for guest to guest, and drivers > will need tuning).
So far macvtap zero copy patch is limited to lower devices supports high memory DMA, it doesn't apply to a tap device or a bridge. > > Don't you think once I address vhost_add_used_and_signal update > > issue, it is a simple and complete patch for macvtap TX zero copy? > > > > Thanks > > Shirley > > I like the fact that the patch is simple. Unfortunately > I suspect it'll stop being simple by the time it's complete :) I can make a try. :) Thanks Shirley -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
