On 12/23/2009 08:15 PM, Gregory Haskins wrote:
On 12/23/09 5:22 AM, Avi Kivity wrote:
There was no attempt by Gregory to improve virtio-net.
If you truly do not understand why your statement is utterly wrong at
this point in the discussion, I feel sorry for you. If you are trying
to be purposely disingenuous, you should be ashamed of yourself. In any
case, your statement is demonstrably bogus, but you should already know
this given that we talked about at least several times.
There's no need to feel sorry for me, thanks. There's no reason for me
to be ashamed, either. And there's no need to take the discussion to
personal levels. Please keep it technical.
To refresh your memory: http://patchwork.kernel.org/patch/17428/
This is not an attempt to improve virtio-net, it's an attempt to push
vbus. With this, virtio-net doesn't become any faster, since the
greatest bottleneck is not removed, it remains in userspace.
If you wanted to improve virtio-net, you would port venet-host to the
virtio-net guest/host interface, and port any secret sauce in
venet(-guest) to virtio-net. After that we could judge what vbus'
contribution to the equation is.
In case its not blatantly clear, which I would hope it would be to
anyone that understands the problem space: What that patch would do is
allow an unmodified virtio-net to bridge to a vbus based virtio-net
backend. (Also note that this predates vhost-net by months (the date in
that thread is 4/9/2009) in case you are next going to try to argue that
it does nothing over vhost-net).
Without the backend, it is useless. It demonstrates vbus' flexibility
quite well, but does nothing for virtio-net or its users, at least
without a lot more work.
This would mean that virtio-net would gain most of the benefits I have
been advocating (fewer exits, cheaper exits, concurrent execution, etc).
So this would very much improve virtio-net indeed, given how poorly the
current backend was performing. I tried to convince the team to help me
build it out to completion on multiple occasions, but that request was
answered with "sorry, we are doing our own thing instead". You can say
that you didn't like my approach, since that is a subjective opinion.
But to say that I didn't attempt to improve it is a flat out wrong, and
I do not appreciate it.
Cutting down on the rhetoric is more important than cutting down exits
at this point in time.
--
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.
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