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

[Ian Campbell <ian.campbell@xxxxxxxxxx>]

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?

>  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.
> >
> > .
> >
> 



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