Re: [MirageOS-devel] irmin + mirage-vnetif + alcotest + good ol' arp

[Mindy <mindy@xxxxxxxxxxxxxxxxxxx>]

On 04/09/2015 07:30 PM, Thomas Gazagnaire wrote:
> > I'm not that far into doing anything interesting with this pile of code, but I 
> > wanted to solicit your thoughts and feedback given all the mumbling and general 
> > noise-making about testing we've been doing.
> >
> > Thanks for your consideration and support. :)
> That's awesome!
>
> I haven't checked the code yet, but is the mapping bi-directionnal, i.e. can 
> you modify the ARP table in the Git repository, commit and then it's picked up 
> by the ARP code?
Yes, it should work this way (once there's more code in place).
> If yes, a good way to stress test the system is to (1) generate a big history 
> of stuff and (2) use git reset --hard to revert to arbitrary points in the past 
> (which are supposed to be consistent) and check that nothing breaks badly (this 
> is a good test for intermediate caches for instances). In a distributed 
> settings, if you keep track of the state of multiple unikernels, you can try to 
> verify that global invariants (involving multiple unikernels) still hold.
Ah, that's a good suggestion.  Thank you!
> Not related to testing, but that would be cool to find a clever use for git 
> pull/push between unikernels (replacing ARP broadcast maybe?)
I'd been thinking about (or maybe remembered talking about with someone 
else?) pre-seeding newly booted unikernels with caches reflecting the 
current state of the local network, which is a less general case of what 
you propose.
-Mindy

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