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Kernel: CPU Isolation and Bugs

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Linux

     
     

  • CPU Isolation – Introduction – by SUSE Labs (part 1)

    CPU isolation is a powerful set of features that can be found behind the settings for workloads which rely on specific and often extreme latency or performance requirements. Some DPDK (Data Plane Development Kit) usecases can cover such examples. However CPU isolation’s documentation and footnotes for many subtleties remain scattered at best if not lagging behind recent developments. It’s not always easy to sort out the benefits and tradeoffs hiding behind the existing range of tunings. Our series of articles aims at shedding some light and guide the users throughout this obscure Linux Kernel subsystem that we maintain both upstream and in our SLE15 products.

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    The role of a kernel is to provide elementary services in order to use the hardware resources through a unified interface. This is the ground on which your workload walks.

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  • Changing One "If" To "While" Caused An Unexpected Shift In A Kernel Benchmark This Week

    Several months back you may recall that Linux 5.9 kernel regression we noted that in turn was bisected to code introduced by Linus Torvalds around page lock fairness. That was ultimately worked out in time with allowing a control over the page lock (un)fairness to address the regressed workloads while being fair enough to satisfy his original change. But now this week for Linux 5.11, Linus Torvalds has again altered the behavior. It then ended up causing a PostgreSQL database server performance regression but fortunately any impact should be very minimal and hopefully not appearing in any real-world situation. 

    Linus this week merged his own patch, mm: make wait_on_page_writeback() wait for multiple pending writebacks. It comes as a fix for his original rewrite of the wait_on_page_bit_common() logic. The issue is seeing occasional reports of BUG_ON() assertions being triggered since that change. Linus ended up uncovering a race condition where the BUG_ON() happens. See that linked patch for all the technical details for those interested. Within the wait_on_page_writeback() function though the patch is just changing an if statement to a while and fixes the BUG_ON assertion that was happening. 

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today's howtos

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    In this tutorial, we are going to explore how to install go on Ubuntu 22.04 Golang is an open-source programming language that is easy to learn and use. It is built-in concurrency and has a robust standard library. It is reliable, builds fast, and efficient software that scales fast. Its concurrency mechanisms make it easy to write programs that get the most out of multicore and networked machines, while its novel-type systems enable flexible and modular program constructions. Go compiles quickly to machine code and has the convenience of garbage collection and the power of run-time reflection. In this guide, we are going to learn how to install golang 1.19beta on Ubuntu 22.04. Go 1.19beta1 is not yet released. There is so much work in progress with all the documentation.

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  • How To Install MongoDB on AlmaLinux 9 - idroot

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