g2k16 Hackathon Report: Alexander Bluhm on mbufs and more

Contributed by rueda on Sat Sep 17 12:18:36 2016 (GMT) from the guten Morgan, England dept. Alexander Bluhm (bluhm@) contributed our next report (which even includes a picture): Big plans what to do at a hackathon don't work. There is always something unexpected that requires your attention. So I was expecting the unexpected. The TCP send performance has dropped to a very low throughput in some environments. It was pretty clear that it was related with claudio@'s change to speed up TCP by using large mbufs instead of chaining small ones. Mbufs are used inside the kernel to hold network data. Using a lot of them requires many allocations and frees. This can be avoided by using larger mbufs. But why did it get slower? Together with mikeb@ we found out that it was related to the mbuf space limit in the socket buffer. One large mbuf filled the send buffer, so no new mbufs could be inserted until TCP received the acknowledgements for everything. So the sliding window algorithm with mbufs cycling through the socket buffer did not work anymore. After identifying the problem, the fix was easy, just increase the default socket buffer mbuf size limit. Read more...

g2k16 Hackathon Report: Patrick Wildt on arm, LLVM and other progress

Contributed by pitrh on Thu Sep 15 21:09:24 2016 (GMT) from the we'll arm that surströmming dept. The g2k16 hackathon must have been a really great one, because here is yet another report, this time from Patrick Wildt, who writes: I knew that if I had any plans for the hackathon, they would have been thrown out of the window as soon as I arrived there. That was a good plan actually, since exactly that happened. Read more...

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g2k16 Hackathon Report: Martin Pieuchot on USB stack and routing progress, more

Contributed by pitrh on Thu Sep 15 10:56:23 2016 (GMT) from the fuzzing my clobberage dept. The g2k16 hackathon reports keep coming, and we love it! In this fresh report, Martin Pieuchot writes, Since some years now, I cannot attend a hackathon without having to deal with a USB problem. It's generally a bug that one of the hackers in the room can expose with his hardware. But in Cambridge it was different! Read more...

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Ted Unangst on "doas mastery"

Contributed by nayden on Tue Sep 13 10:14:38 2016 (GMT) from the not MWL dept. Ted Unangst (tedu@) has written an item regarding doas: It’s been a year since the introduction of doas, so it’s clearly time to write a book. Or maybe a pamphlet. See his flak entry for the full story (and bear in mind he's referring to -current at the time of writing).

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g2k16 Hackathon Report: Matthieu Herrb on xenodm

Contributed by rueda on Sun Sep 11 12:58:31 2016 (GMT) from the It is an xdm dept. Matthieu Herrb supplied our next g2k16 report: I arrived in Cambridge on Tuesday afternoon, after a nice 9h train trip from Toulouse through Paris and the tunnel. I started the hackathon by upgrading a number of packages in Xenocara. The most noteworthy being the XCB (X protocol C-language Bindings) suite updated to the most recent 1.12 version. Read more...

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DragonFly BSD adopts uses of LibreSSL

Contributed by pitrh on Thu Sep 8 13:56:46 2016 (GMT) from the Viva Puffy! dept. DragonFly BSD has joined HardenedBSD and TrueOS (formerly PC-BSD) in adopting LibreSSL in the base system: Switch base to use private LibreSSL libaries All base users of the OpenSSL libraries (libssl.so and libcrypto.so) have been modified to link against the new LibreSSL versions instead.

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g2k16 Hackathon Report: Antoine Jacoutot on binary patches, ports progress and more

Contributed by rueda on Sun Sep 11 00:00:12 2016 (GMT) from the bin-bin-bin-patches! dept. Here's yet another g2k16 hackathon report, this one from Antoine Jacoutot, who writes: This was my first time in Cambridge and I must say I really enjoyed the place. It's a gorgeous town and avsm@ and Gemma's organization of the hackathon was just perfect. So first of all, thank you very much to them and to the OpenBSD Foundation. Read more...

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g2k16 Hackathon Report: Vincent Gross on iked(8), armv7 and sys/netinet[6]

Contributed by rueda on Sun Sep 11 00:03:18 2016 (GMT) from the I like iked dept. Vincent Gross supplied the next hackathon report: Although I did attend two hackathons previously, g2k16 at Cambridge was my first general hackathon. I had three targets on my list for this week : iked(8), armv7 and sys/netinet[6]. Read more...

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g2k16 Hackathon Report: Florian Obser on httpd, networking, acme-client, and more

Contributed by rueda on Sat Sep 10 12:22:18 2016 (GMT) from the Let's Rename dept. Next up in the series of g2k16 hackathon reports is this one from Florian Obser, who writes: One of the first things to do when attending a hackathon is travel planning. For me this started a few months back when I got annoyed that getting there would waste a whole day. And I live somewhat close by! Shall I go by train? But how do I figure this out? I could fly, but to where, and then what, need to figure out train options... Read more...

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