Much better than last week, but there wasn’t any hurricane-force winds this week – which helps.
BSDNow 185 has existing host Kris Moore performing his last episode (because $dayjob) and Benedict Reuschling coming in to replace him. Allan Jude is unchanged, of course. As they correctly point out, 185 weeks of on-time video content is a tremendous achievement so far. This week’s episode is 55 minutes of talking with the old and the new staff.
Sepherosa Ziehau went to AsiaBSDCon 2017 and gave a talk on his work with DragonFly’s networking. He’s published a report of his trip, which comes with a link to his paper, his presentation, and pictures of who he met.
Note that the PDF and the Powerpoint slides links are different; one is the paper, one is the talk. The Powerpoint slides contain the benchmarks linked here in comments, previously.
Matthew Dillon picked up a number of different NVMe SSD drives, and tested them. He wrote up the entire test, but the immediate summary is: buy Samsung.
I always attributed speed issues to writing transaction history, but: Matthew Dillon discovered HAMMER was repeating itself when writing to disk. Fixing that issue doubled write speed. This fix is in 4.6 and the upcoming release.
I tagged the release candidate for DragonFly 4.8 – slightly delayed because of my involuntary time offline – and here’s the resulting automatic changelist. There’s ISO/IMG files uploaded now to the main DragonFly archive, which means they should be available at a mirror near you soon.
I had overflow from last week, so I have a good list for you, despite being offline for days.
Your unrelated tea link of the day: defining what it means when you read “mug of tea” vs “cup of tea”. You’d think it was interchangeable, but the meanings diverge. (PDF, via)
Way short this week because we had high winds in my area, knocking out power for most people. I didn’t lose power, but I lost my data link.
Michael W. Lucas will be showing up tomorrow with physical copies of his books at the Grosse Pointe Library. (I’m assuming it will be both his fiction and non-fiction BSD books.) If you are near, I bet you can get a signed copy.
Even though the hosts are currently off to AsiaBSDCon, BSDNow is once again a bit early with lots of BSD news, plus an interview of Konrad Witaszczyk, apparently about encrypted crash dumps.
In what can be described as perfect timing, Sepherosa Ziehau has produced a document comparing FreeBSD, several different Linux kernels, and DragonFly, for networking. He’s presenting it in the afternoon track of Day 3 for AsiaBSDCon 2017, starting later this week.
He’s published a snippet as a PDF (via), which includes some graphs. The one place Linux outperforms DragonFly seems to be linked to the Linux version of the network card driver being able to access more hardware – so DragonFly should be comparable or better there too, once the powers-of-2 problem is solved. (This already came up in comments to a post last week.)
Those graphs are available standalone, too, which means it’s easier to see the fantastic performance for latency – see the thin blue line – that seems exclusive to DragonFly. That, if anything, is the real takeaway; that DragonFly’s model has benefits not just to plain speed but to the system’s responsiveness under load. “My CPU is maxed out cause I’m doing a lot of work but I hardly notice” is a common comment over the past few years – and now we can see that for network performance, too.
A little meta, this week.
Your unrelated tea link of the week: In Sri Lanka’s Tea Paradise, A Social Enterprise Is Brewing. I actually heard about the quality of the tea (very good) before I heard about the way the company was formed. Consider where your next tea purchase comes from, in light of this.
Slightly short this week, maybe because people are prepping for AsiaBSDCon? I have plenty of links for tomorrow’s Lazy Reading.
The longstanding practice is to load kernel modules in loader.conf, as early as possible. That’s good, for anything that needs them.
However, that also can be bad. Your machine can be unbootable if there’s a problem with a module or loader.conf is messed up, since that file is read long before the startup process finishes. Enter the new alternative: modules can be loaded in rc.conf, and the only loader.conf modules needed are those required by / to mount.
Matthew Dillon has been doing a significant amount of work on cache lines, and I haven’t been linking to it because it’s hard to point at single commits with such a technical subject. However, he’s summarized it all, along with news on NUMA handling and vkernel improvements.
The again-early BSDNow episode this week has an interview with Tom Jones about BSD Sockets, plus a number of news items that include something new to me: playonBSD.
Matthew Dillon moved some locks and exec() performance jumped up significantly – 50% or more. This is a single system call, so I don’t know how much translates through to real performance change, but it’s interesting to see.
The normal monthly meeting for NYCBUG for March 1st (tomorrow) is canceled; next month’s meeting is still on.
BSD author Michael W. Lucas is talking at the Troy Public Library (Michigan, not New York) tonight, about his nonfiction writing. Go, if you like his books and/or if you are thinking about technical writing for yourself. He has another appearance coming up on March 11th.
Reminder: the 2017 FreeBSD Storage Summit is tomorrow.