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When and Where ?

Rackspace Ltd, May 29-30

We confirmed the Xen Project Hackathon for May 29-30, 2014 in London, UK at Rackspaces London Site.

We will start at 9AM and finish at 5PM each day. There will also be an evening social event on May 29th : more details will follow.


Rackspace Ltd
5 Millington Road
Hyde Park Hayes

Check out the event location on the map


May 29th

8:45 - 9:30 	Registration & Breakfast (Breakfast will be provided)
9:30 - 9:45	Welcome
9:45 - 10:30	Scheduling
10:30 - 11:30	Sessions 1
11:30 - 12:30	Sessions 2
12:30 - 13:30 	Lunch
13:30 - 14:30	Sessions 3
14:30 - 15:30	Sessions 4
15:30 - 16:00	Break 
16:00 - 17:00	Sessions 4
17:00 - 17:30	Plenary
17:30 - 17:45	Group Photo
17:45 - 18:15	Walk to The Old Vinyl Factory
18:15 - 21:15	Dinner and Drinks @ The Old Vinyl Factory

Information about The Old Vinyl Factory

May 30th

9:00 - 9:45	Breakfast
9:45 - 10:15	Scheduling
10:15 - 11:30	Sessions 1
11:30 - 12:30	Sessions 2
12:30 - 13:30 	Lunch
13:30 - 14:30	Sessions 3
14:30 - 15:30	Sessions 4
15:30 - 16:00	Break 
16:00 - 16:45	Plenary: Share achievements
16:45 - 17:00	Closing

Hotel Options

StayCity Serviced Apartments (~5 minutes from venue)

StayCity Serviced Apartments
Highpoint Village, Station Approach, Hayes UB3 4FN
Closest Train Station: Directly next to Hayes and Harlington Station (National Rail and District/Central tube line). 15/20 minutes to Paddington station on the Overground line and 15 minutes on the fast train to Paddington or 30 minutes on the slow train.
Distance from Venue: 4 minute walk to Rackspace office.
Nightly Rate is £68-£90, not central

Hotel Xanadu (~23 minutes from venue)

Hotel Xanadu
26-42 Bond St, London W5 5AA
Closest Train Station: Ealing Broadway (National Rail and District/Central tube line)
Distance from Venue: Around 23 minutes to Venue and 15 minutes to Paddington station on the Overground line.
Nightly Rate is £130-£220

Hilton Paddington (~26 minutes from venue)

Hilton Paddington
Hilton London Paddington Hotel, 146 Praed St, London W2 1EE
Closest Train Station: Inside London Paddington Station (National Rail and multiple underground stations)
Distance from Venue: Approx 30 minutes to Hayes and Harlington
Nightly Rate is £180-£260

Hotel Indigo Paddington (~27 minutes from venue)

Hotel Indigo London Paddington
16 London Street, Paddington, London W2 1HL
Closest Train Station: Inside London Paddington Station (National Rail and multiple underground stations)
Distance from Venue: Approx 30 minutes to Hayes and Harlington
Nightly Rate is £200-£280

Mercure London Paddington Hotel (~26 minutes from venue)

Mercure London Paddington Hotel
144 Praed St, Paddington, London, W2 1HU
Closest Train Station: Inside London Paddington Station (National Rail and multiple underground stations)
Distance from Venue: Approx 30 minutes to Hayes and Harlington
Nightly Rate is £130-£200

Other Paddington Options

Note that there are many hotels within walking distance of London Paddington at different price points

Transport Information

Getting from London Heathrow to Paddington and/or Ealing (Hotel Xanadu)

  • Heathrow Express will get you from LHR to Paddington in 15 minutes (runs every 15 minutes)
  • Heathrow Connect will get you to Ealing Broadway (Hotel Xanadu) in 10 minutes (runs every 30 minutes)

Getting from London Paddington to Hayes and Harlington Station

To get from London Paddington to Hayes and Harlington Station you have two fast options via London Overground

  • Trains going to Oxford or Reading will stop in Hayes & Harlington. The train fare is £5.90 and takes 17 or 19 minutes
  • Heathrow Connect takes 20 minute and leaves at 03 and 33 past each hour
  • There are approximately 7 trains leaving every hour

To go back, take any train to London Paddington

Walking from Hayes and Harlington Station to the Rackspace Office

Click on Image for more information.

Visa Invitation Letters

If you require an invitation, please send an e-mail to community dot manager at xenproject dot org

Topics to Discuss, Code, Work on, ... at the Hackathon



Please add topics you want to discuss in this section

Various process/infrastructure issues: xen-devel list traffic, devel IRC channel, personal repos, maintainerships

Date of insert: 2014-02-27
Technical contact: Lars Kurth
Difficulty: N/A
Skills Needed: N/A
Description: I think we have a few issues:
  • Traffic on xen-devel has doubled in the last 2 years and is getting hard to handle. I would like to discuss different options and then make a proposal to the community
  • Reviews: seems we have a bottleneck of review capability in some areas - how to resolve?
  • We need a more open approach to devel IRC
  • We had a few requests for hosting team branches and personal repos : we need a document outlining when we would give someone a repo and how to request one
  • Maintainership : I believe there is a mismatch between our governance and what maintainers/committers expect. Maybe we can clarify
Outcomes: Draft proposal on developer lists, more open devel IRC and personal and team/integration repos

VirtIO and Xen

Date of insert: 2014-18-03
Technical contact: Daniel Kiper
Difficulty: N/A
Skills Needed: N/A
Description: Discuss the technical issues related to make VirtIO work on Xen.
Outcomes: Use information for the VIRTIO-46

Merging PVH into HVM

Date of insert: 2014-03-27
Technical contact: Tim Deegan
Difficulty: Moderate
Skills Needed: Hypervisor internals
Description: I would like to make 'PVH' a special case of 'HVM' inside the hypervisor rather than a third VM type, removing some special cases and simplifying code. Much of that will be mechanical but there are some open questions around IO handling, CPUID etc.
Outcomes: A plan, and hopefully some code!
GSoC: Unknown

Incubation project proposals

Date of insert: 2014-03-28
Technical contact: Lars Kurth
Difficulty: N/A
Skills Needed: N/A
Description: Two incubation project proposals are currently being worked on. I am still waiting for drafts:
  • One for Windows PV drivers
  • One for automotive / android (where the bulk may be userspace driver front-ends) and possibly some code/drivers specific to a few proprietary guest OS'es
As we are all there, it makes sense to review, propose changes and if we feel the proposals are good, to vote on them
Outcomes: Review (and vote on proposals), if they are ready in time

Libvirt and Xen integration / co-operation

Date of insert: 2014-04-08
Technical contact: David Scott, Daniel Berrange
Difficulty: N/A
Skills Needed: N/A
Description: We would like to sync-up with other community members on libvirt + xen and to help make the default experience on Linux distributions better. References, see
Outcomes: Investigate designs, patches, approaches to improve Xen integration in Libvirt

NFV on Xen

Date of insert: 2014-04-10
Technical contact: Joao Martins
Difficulty: N/A
Skills Needed: N/A
Description: A discussion on open issues regarding using Xen as an efficient NFV platform: fast packet I/O, network backend and our recent optimizations as part of developing ClickOS. We would further like to discuss how to go about mainstreaming our changes.
Outcomes: Discussion, Plan
GSoC: n/a

Peer Review Comments
*  Jbeulich 07:12, 7 May 2014 (UTC) What is NFV? Please don't use acronyms unexplained unless it is clear that everybody knows them.

Xen 4.5 roadmap

Date of insert: 2014-04-21
Technical contact: Everybody
Difficulty: N/A
Skills Needed: N/A
Description: Figure out what we want in Xen 4.5.
Outcomes: Roadmap

Using Docker to deploy driver domains, service VMs, Mirage OS VMs, and friends - Can it be done?

Date of insert: 2014-04-23
Technical contact: Raised by Lars, but does not have the technical depth to really lead it (happy to take notes though)
Difficulty: N/A
Skills Needed: N/A
Description: Docker is making a lot of waves in open source communities. There are really two functional aspects to Docker:
  • Linux Containers as lightweight hypervisor (with all the security drawbacks)
  • Application Containers as a packaging and deployment format - this part is really exciting as it is a gamechanger in application design, system deployment, and, critically, versioning. Slides 1-15 of [1] make this case quite compellingly.

What is not clear is how tightly the two are coupled and interdependent. I heard (but can't find references) that there are, or it is possible to write Docker Engines for other hypervisors. At least in theory.

Now, if you look at slide 16, you notice that the architecture diagram is very similar to a Xen based system with service domains, driver domains, and the likes of Mirage OS, OSv, ErlangOnXen (also see Voxoz which seem to be working on something similar), ... BUT: of course we have the added benefits of isolation and thus more security and the flexibility of running traditional fully fledged VMs with different Guest OS’es on the same host.

At least in theory, this should make it possible to use the deployment capabilities of Docker to deploy service domains, Mirage OS & friends. If this was possible and could be implemented easily we could be in for a winner. Aka getting all the benefits for the deployment part of Docker, while not suffering any of the drawbacks. And we could piggyback onto the Docker hype. Of course I don’t know whether this is technically feasible at all and how hard it would be to do this.

Maybe relevant References:

Outcomes: Is it feasible to do this? Would anyone be interested? Are there next steps?

Dealing with XSA-77 fallout

Date of insert: 2014-05-07
Technical contact: Jan Beulich
Difficulty: Moderate
Skills Needed: hypervisor internals
Description: While the security aspect of these issues got waived by the XSA, these still represent problems even outside of disaggregation.
Outcomes: Determine set of people willing (and having time) to help.

Further memory scalability

Date of insert: 2014-05-07
Technical contact: Jan Beulich
Difficulty: Advanced
Skills Needed: hypervisor memory management internals
Description: Having reached support for 16Tb, vendors are in the process of delivering even bigger systems.
Outcomes: Determine which possible routes are viable to explore in more depth.

HVM guest ballooning vs PoD

Date of insert: 2014-05-09
Technical contact: Jan Beulich
Difficulty: Intermediate
Skills Needed: ballooning and PoD understanding
Description: How to determine the precise amount a HVM guest needs to balloon down.
Outcomes: An answer to above question, irrespective of whether verbal or in form of code.

EFI + GRUB2 + Xen

Date of insert: 2014-05-12
Technical contact: Daniel Kiper
Difficulty: Intermediate
Skills Needed: N/A
Description: Discuss the technical issues related to current multiboot2 protocol implementation. More information could be found here:
Outcomes: Plan how to solve this issue.

Porting Xen on Euroserver Architecture

Date of insert: 2014-05-26
Technical contact: Julian Chesterfield
Difficulty: N/A
Skills Needed: N/A
Description: Discuss the technical issues and challenges related to porting effort of Xen on Euroserver microserver architecture.

Relevant References:

Outcomes: Determine possible direction regarding developing XEN on microservers.

CentOS Virt SIG techical issues

Date of insert: 2014-05-27
Technical contact: George Dunlap
Difficulty: N/A
Skills Needed: N/A
Description: Discussion of any open technical issues related to CentOS Virt SIG. Possible topics include:
  • Custom qemu-kvm build for oVirt
  • Integration of oVirt
  • Sorting out push workflow
  • Other plans for the future

I want to attend

Request an Invitation

Request Invite

As spaces at the Xen Project Hackathon are limited, we are asking attendees to request an invitation. If you did, you will be notified by email within 5 business days with instructions on how to confirm your invitation.

As last year, we will be asking for a small registration fee of $15. This fee will be given to a charity or open source organisation. You will need to cover your own travel, accommodation and other costs such as evening meals, etc. We do have limited travel stipends available for individuals who cannot afford to travel: please contact community dot manager at xen dot org if you need to make use of it.

I have an Invitation

We will email you instructions on how to confirm your invitation request.

Confirmed attendees

Note that we only have a maximum of 40 spaces for non Rackspace employees:

  1. Lars Kurth, Citrix
  2. Olivier Lambert, Vates
  3. Julien Fontanet, Vates
  4. Ian Campbell, Citrix
  5. Daniel Berrange, Red Hat
  6. Daniel Kiper, Oracle
  7. Donald Slutz, Verizon Communications
  8. Stefano Stabellini, Citrix
  9. Tim Deegan, Xen Project
  10. Michail Flouris, OnApp
  11. Michail Alvanos, OnApp
  12. Xenia Ragiadakou, OnApp
  13. Joao Martins, NEC Europe Ltd
  14. Donald Koch, Verizon Communications
  15. Dario Faggioli, Citrix
  16. Anthony PERARD, Citrix
  17. George Dunlap, Citrix
  18. Ian Jackson, Citrix
  19. Filipe Manco, NEC Europe Ltd
  20. Roger Pau Monné, Citrix
  21. Boris Ostrovsky, Oracle
  22. Thomas Leonard, University of Cambridge
  23. Anil Madhavapeddy, University of Cambridge
  24. Dave Scott, Citrix
  25. Jonathan Ludlam, Citrix
  26. Konrad Wilk, Oracle
  27. Wei Liu, Citrix
  28. Julien Grall, Linaro
  29. David Vrabel, Citrix
  30. Andrew Cooper, Citrix
  31. Jan Beulich, Suse
  32. Srinivas Kalaga, Samsung
  33. Karanbir Singh, Red Hat
  34. Dan Kenigsberg, Red Hat
  35. Marc Zyngier, ARM (29th only)
  36. Malcolm Crossley, Citrix
  37. Hwanju Kim, Cambridge University
  38. Julian Chesterfield, OnApp
  39. Zoltan Kiss, Citrix

Named Rackspace Employees

  1. John Garbutt, Rackspace
  2. Gus Maskowitz, Rackspace

Provisionally Confirmed attendees

These are people who want to come, but waiting for visas or other confirmation

  1. Andrii Tseglytskyi, GlobalLogic

Waiting Listed people

  1. Wernher Garcia, Comtel
  2. Euan Harris, Citrix
  3. Nik Sultan, Cambridge University
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