Hello Michael, On Wed, 2010-09-15 at 07:52 -0700, Shirley Ma wrote: > > > 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. :) I compared several approaches for addressing the issue being raised here on how/when to update vhost_add_used_and_signal. The simple approach I have found is: 1. Adding completion field in struct virtqueue; 2. when it is a zero copy packet, put vhost thread wait for completion to update vhost_add_used_and_signal; 3. passing vq from vhost to macvtap as skb destruct_arg; 4. when skb is freed for the last reference, signal vq completion The test results show same performance as the original patch. How do you think? If it sounds good to you. I will resubmit this reversion patch. The patch still keeps as simple as it was before. :) Thanks Shirley -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
