![]() Instructional tutorials he's written have been linked to by organizations like The New York Times, Wirecutter, Lifehacker, the BBC, CNET, Ars Technica, and John Gruber's Daring Fireball. The news he's broken has been covered by outlets like the BBC, The Verge, Slate, Gizmodo, Engadget, TechCrunch, Digital Trends, ZDNet, The Next Web, and Techmeme. Beyond the column, he wrote about everything from Windows to tech travel tips. He founded PCWorld's "World Beyond Windows" column, which covered the latest developments in open-source operating systems like Linux and Chrome OS. He also wrote the USA's most-saved article of 2021, according to Pocket.Ĭhris was a PCWorld columnist for two years. Beyond the web, his work has appeared in the print edition of The New York Times (September 9, 2019) and in PCWorld's print magazines, specifically in the August 2013 and July 2013 editions, where his story was on the cover. With over a decade of writing experience in the field of technology, Chris has written for a variety of publications including The New York Times, Reader's Digest, IDG's PCWorld, Digital Trends, and MakeUseOf. Chris has personally written over 2,000 articles that have been read more than one billion times-and that's just here at How-To Geek. If you installed Ubuntu 18.04 using Ubuntu 18.04.1 or the original Ubuntu 18.04, you won't automatically get the new Linux kernel.Ĭhris Hoffman is the former Editor-in-Chief of How-To Geek. If you installed Ubuntu 18.04 using the Ubuntu 18.04.2 installer, you will automatically get the Ubuntu 18.04.3 update featuring the new Linux kernel. Businesses don't necessarily want a big new kernel update arriving out of nowhere. After all, Long Term Service releases are all about stability. These weren't automatically installed on existing systems to ensure they don't break anything. The stack consists of a newer Linux kernel, X.org graphical server, and graphics drivers. The Ubuntu 18.04.2 release included a new "hardware enablement" (HWE) stack. These include the latest software updates that would typically be installed after you install Ubuntu 18.04. Instead of offering the original Ubuntu 18.04 LTS image for years and forcing everyone to update a lot of software after installing it, Ubuntu regularly releases new Ubuntu 18.04 installers in ISO form. It’s one of those things that’s hard to believe is happening but there’s definitely something happening, I swear.Here's how this works. Hopefully someone else hits it and has more bandwidth. So, however haproxy uses epoll doesn’t trigger whatever the issue is.Īnyway, this thing is annoying me a lot, but every time I need to test it I need to use a VM with 64+ cores which costs a bunch of money. The jvm fails in epoll after something like 9,000,000 requests if load tested directly. Weirdly enough, I can never get haproxy to fail. Since it’s not netty related it doesn’t matter I guess). With this chain nginx fails after about 1000 requests from 100 concurrent clients (the error message references epoll_wait, but I had to stop my testing for today so I forget the exact message. So I chained:īasically just proxying the request but generating a lot of epoll events in the kernel. It’s easier when you run more things that use epoll. So just running the jvm, you need a bunch of CPUs and a load tester with a lot of clients, etc. The issue is hard to reproduce because you need to have a lot of epoll usage on the system to trigger whatever it is. My hunch on the cause is this commit (or the ones surrounding it, but they’re all interdependent so it’s not really possible to revert just one): I was able to make nginx fail in a similar way using epoll, so I’m going to close this. Reply to this email directly, view it on GitHub, or mute the thread. You are receiving this because you are subscribed to this thread. Maybe 5.0.x has some changes to epoll the JDK isn’t aware of? Unfortunately as this happened in production on a canary deployment it’s hard for me to test it again without annoying users. I’m not sure if this is a JDK issue but I tried OpenJDK 11 and 12.īasically, on 5.0.x I see a lot of extra WRITABILITY_CHANGED events in the netty debug output that don’t happen on any older kernel version (I tested the latest 4.14.x through 4.20.x).Īlong with the extra events, the data netty writes to the socket doesn’t seem to be fully flushed or something, and the other end of the socket will time out thinking it has to read more data. There’s something wrong with netty and kernels 5.0 through 5.0.3 (haven’t tested 5.0.4 or 5.0.5 but the Changelogs don’t seem applicable). Am um 02:22 schrieb Omar Kilani not confident in the exact culprit for this issue, but wanted to add it here in case someone else hits it and decides to Google.
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