Messages in this thread | | | Subject | Re: [RFC PATCH 2/2] macvtap: TX zero copy between guest and host kernel | From | Shirley Ma <> | Date | Wed, 15 Sep 2010 07:52:34 -0700 |
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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
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