Anthony Liguori wrote: > Anthony Liguori wrote: >> Avi Kivity wrote: >>> Avi Kivity wrote: >>>> >>>> The alternative is to get a notification from the stack that the >>>> packet is done processing. Either an skb destructor in the kernel, >>>> or my new API that everyone is not rushing out to implement. >>> >>> btw, my new api is >>> >>> >>> io_submit(..., nr, ...): submit nr packets >>> io_getevents(): complete nr packets >> >> I don't think we even need that to end this debate. I'm convinced we >> have a bug somewhere. Even disabling TX mitigation, I see a ping >> latency of around 300ns whereas it's only 50ns on the host. This >> defies logic so I'm now looking to isolate why that is. > > I'm down to 90us. Obviously, s/ns/us/g above. The exec.c changes > were the big winner... I hate qemu sometimes. [ Ive already said this privately to Anthony on IRC, but ..] Hey, congrats! Thats impressive actually. So I realize that perhaps you guys are not quite seeing my long term vision here, which I think will offer some new features that we dont have today. I hope to change that over the coming weeks. However, I should also point out that perhaps even if, as of right now, my one and only working module (venet-tap) were all I could offer, it does give us a "rivalry" position between the two, and this historically has been a good thing on many projects. This helps foster innovation through competition that potentially benefits both. Case in point, a little competition provoked an investigation that brought virtio-net's latency down from 3125us to 90us. I realize its not a production-ready patch quite yet, but I am confident Anthony will find something that is suitable to checkin very soon. That's a huge improvement to a problem that was just sitting around unnoticed because there was nothing to compare it with. So again, I am proposing for consideration of accepting my work (either in its current form, or something we agree on after the normal review process) not only on the basis of the future development of the platform, but also to keep current components in their running to their full potential. I will again point out that the code is almost completely off to the side, can be completely disabled with config options, and I will maintain it. Therefore the only real impact is to people who care to even try it, and to me. -Greg
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