Re: [Xen-devel] [PATCH v6 COLO 10/15] COLO proxy: implement setup/teardown of COLO proxy module

[Yang Hongyang <yanghy@xxxxxxxxxxxxxx>]

On 06/25/2015 04:39 PM, Ian Campbell wrote:
> On Thu, 2015-06-25 at 13:22 +0800, Yang Hongyang wrote:
> > On 06/16/2015 07:26 PM, Ian Campbell wrote:
> > > On Tue, 2015-06-16 at 12:24 +0100, Ian Campbell wrote:
> > > > On Mon, 2015-06-08 at 11:45 +0800, Yang Hongyang wrote:
> > > > > setup/teardown of COLO proxy module.
> > > > > we use netlink to communicate with proxy module.
> > > > What is a COLO proxy module and where would one get hold of such a
> > > > thing?
> > > >
> > > > Is this a new kernel feature with a patch? If so then please link to its
> > > > posting to the appropriate upstream and indicate what you understand of
> > > > its progress upstream.
> > > >
> > > > (I seem to remember discussing a COLO networking component at the
> > > > hackathon which seemed like it could be done using existing components,
> > > > is that this?)
> > > IIRC the existing component I was thinking of was
> > > http://www.netfilter.org/projects/libnetfilter_queue/ which allows
> > > userspace to do pretty advanced filtering, queueing, gating, delaying
> > > etc of packets.
> > The reason we are not using userspace solution is that we worried about
> > the performance.
> Is this a theoretical concern or something which has actually been
> observed to be a problem in practice?
It is a theoretical concern, we haven't had time try to implement the
userspace solution yet.

> >   There will be huge amount of packets pass through, the
> > context switch cost will be an overhead. The colo-proxy module:
> > https://lkml.org/lkml/2015/6/18/32
> >
> > > Ian.
> > >
> > > .
>
> .
--
Thanks,
Yang.

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