Skip to main content.

Episode 106: Multipath TCP


Direct Download:

Video | HD Video | MP3 Audio | OGG Audio | Torrent

This episode was brought to you by

iXsystems - Enterprise Servers and Storage for Open SourceDigitalOcean - Simple Cloud Hosting, Built for DevelopersTarsnap - Online Backups for the Truly Paranoid


Backing out changes doesn.t always pinpoint the problem

  • Peter Wemm brings us a fascinating look at debugging an issue which occurred on the FreeBSD build cluster recently.
  • Bottom line? Backing out something isn.t necessarily the fix, rather it should be apart of the diagnostic process
  • In this particular case, a change to some mmap() functionality ended up exposing a bug in the kernel.s page fault handler which existed since (wait for it.) 1997!
  • As Peter mentions at the bottom of the Article, this bug had been showing up for years, but was sporadic and often written off as a networking hiccup.

BSD Router Project benchmarks new routing changes to FreeBSD

[When is SSL not SSL?] (

  • Our buddy Ted has a good write-up on a weird situation related to licensing of stunnel and LibreSSL
  • The problem exists due to stunnel being released with a different license, that is technically incompatible with the GPL, as well as linking against non-OpenSSL versions.
  • The author has also decided to create specific named exceptions when the *SSL lib is part of the base operating system, but does not personally consider LibreSSL as a valid linking target on its own
  • Ted points out that the LibreSSL team considers LibreSSL == OpenSSL, so this may be a moot concern

Update on systembsd

  • mentioned the GSoC project to create a SystemD shim in OpenBSD before. Now we have the slides from Ian Sutton talking about this project.
  • As a refresher, this project is to take DBUS and create daemons emulating various systemd components, such as hostnamed, localed, timedated, and friends.
  • Written from scratch in C, it was mainly created in the hopes of becoming a port, allowing Gnome and related tools to function on OpenBSD.
  • This is a good read, especially for current or aspiring porters who want to bring over newer versions of applications which now depend upon SystemD.

Interview - Nigel Williams -

Multipath TCP

News Roundup

OpenBSD UEFI boot loader

  • mentioned the ongoing work to bring UEFI booting to OpenBSD and it looks like this has now landed in the tree
  • The .fdisk. utility has also been updated with a new -b flag, when used with .-i. will create the special EFI system partition on amd64/i386 . (
  • Some twitter benchmarks

FreeBSD Journal, July/August issue

  • The latest issue of the FreeBSD Journal has arrived
  • As always, the Journal opens with a letter from the FreeBSD Foundation
  • Feature Articles:
  • Groupon's Deal on FreeBSD -- How to drive adoption of FreeBSD at your organization, and lessons learned in retraining Linux sysadmins
  • FreeBSD: The Isilon Experience -- Mistakes not to make when basing a product on FreeBSD. TL;DR: track head
  • Reflections on Packages -- A status update on where we are with binary packages, what issues have been overcome, and which still remain
  • Inside the Foundation -- An overview of some of the things you might not be aware that the FreeBSD Foundation is doing to support the project and attract the next generation of committers
  • Includes a book review of .The Practise of System and Network Administration.
  • As usual, various other reports are included: The Ports Report, SVN Update, A conference report, a report from the Essen hackathon, and the Event Calendar

Building ARMv6 packages on FreeBSD, the easy way

  • Previously we have discussed how to build ARMv6 packages on FreeBSD
  • We also interviewed Sean Bruno about his work in this area
  • Thankfully, over time this process has been simplified, and no longer requires a lot of manual configuration, or fussing with the .image activator.
  • Now, you can just build packages for your Raspberry Pi or similar device, just as simply as you would build for x86, it just takes longer to build.

New PC-BSD Release Schedule

  • The PC-BSD Team has announce an updated release schedule for beyond 10.2
  • This schedule follows more closely the FreeBSD schedules, with major releases only occurring when FreeBSD does the next point update, or major version bump.
  • PC-BSD.s source tree has been split into master(current) and stable as well
  • PRODUCTION / EDGE packages will be built from stable, with PRODUCTION updated monthly now. The -CURRENT monthly images will contain the master source builds.


  • A BSDCon down in Brazil is being organized. To get in touch with the folks behind it, checkthem out on twitter @bsdconbr (
  • Send questions, comments, show ideas/topics, or stories you want mentioned on the show to

Latest News

New announcement


We understand that Michael Dexter, Brad Davis, and George Rosamond think there should be more real news....

Two Year Anniversary


We're quickly approaching our two-year anniversary, which will be on episode 105. To celebrate, we've created a unique t-shirt design, available for purchase until the end of August. Shirts will be shipped out around September 1st. Most of the proceeds will support the show, and specifically allow us to buy...

New discussion segment


We're thinking about adding a new segment to the show where we discuss a topic that the listeners suggest. It's meant to be informative like a tutorial, but more of a "free discussion" format. If you have any subjects you want us to explore, or even just a good name...

How did you get into BSD?


We've got a fun idea for the holidays this year: just like we ask during the interviews, we want to hear how all the viewers and listeners first got into BSD. Email us your story, either written or a video version, and we'll read and play some of them for...

Episode 243: Understanding The Scheduler


This episode was brought to you by Headlines OpenBSD 6.3 released Punctual as ever, OpenBSD 6.3 has been releases with the following features/changes: > Improved HW support, including: > SMP support on OpenBSD/arm64 platforms > vmm/vmd improvements: > IEEE 802.11 wireless stack improvements > Generic network stack improvements > Installer improvements > Routing daemons and other userland network improvements > Security...

Episode 242: Linux Takes The Fastpath


Direct Download:MP3 AudioVideo This episode was brought to you by Headlines TrueOS STABLE 18.03 Release The TrueOS team is pleased to announce the availability of a new STABLE release of the TrueOS project (version 18.03). This is a special release due to the security issues impacting the computing world since the beginning...

Episode 241: Bowling in the LimeLight


Direct Download:MP3 AudioVideo This episode was brought to you by Headlines [Other big ZFS improvements you might have missed] 9075 Improve ZFS pool import/load process and corrupted pool recovery > One of the first tasks during the pool load process is to parse a config provided from userland that describes what devices the pool is...

Episode 240: TCP Blackbox Recording


Direct Download:VideoMP3 Audio This episode was brought to you by Headlines [A number of Upstream ZFS features landed in FreeBSD this week] 9188 increase size of dbuf cache to reduce indirect block decompression With compressed ARC (6950) we use up to 25% of our CPU to decompress indirect blocks, under a workload of...