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Kernel: AMD, LVFS, Intel, and Bootlin

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Linux

  • New Linux Scheduler Patches Can Improve AMD Zen Performance For Some Workloads - Phoronix

    A set of two patches under review on the kernel mailing list for tweaking some kernel scheduler behavior can provide noticeable performance benefits to those using AMD EPYC and Ryzen processors on various workloads.

    Last year the Linux kernel scheduler code was adapted to allow a floating imbalance between NUMA nodes until 25% of the CPU cores are occupied while higher than that the balancing behaves as normal. Prior to that an imbalance between NUMA nodes was only allowed when the destination node was effectively idle.

    Longtime Linux kernel developer Mel Gorman who wrote that floating imbalance change between NUMA nodes for the kernel last year has revisited it. Where there isn't a 1:1 relationship between the last-level cache (LLC) and node, such as the case for AMD Zen processors, the imbalancing can be sub-optimal for multiple LLCs.

  • Linux Vendor Firmware Service Serves Up 40 Millionth Download - Phoronix

    With the accelerating growth of the Linux Vendor Firmware Service (LVFS) for serving up system and component firmware files to Linux users for flashing via the fwupd utility, today it crossed the milestone of having served up more than 40 million firmware files.

    LVFS/fwupd lead developer Richard Hughes of Red Hat shared the news of crossing the 40 million download milestone. It's quite a milestone considering back in March of this year was the milestone of 25 million firmware downloads.

  • Intel's Alder Lake is slowing down Linux kernel 5.16 • The Register

    The mixture of performance and efficiency CPUs in Intel's 12th-gen Core processors, code-named Alder Lake, hasn't just caused problems for some Windows gamers – it's led to complications for Linux.

    Phoronix' Michael Larabel noticed that Release Candidate 1 of the future kernel ran slower than expected on Alder Lake motherboards.. What may be a partial fix, at least, has just landed.

    This performance regression involves two related problems. What's interesting is that the origins of at least one of the issues affecting the latest Intel chips lies in a totally different architecture.

  • Bootlin eligible to French “Crédit Impôt Recherche” tax incentive

    In 2021, Bootlin has initiated the process to be eligible to this tax incentive mechanism, and we are happy to announce that after studying Bootlin’s expertise, engineering experience and achievements, the French tax administration has confirmed that Bootlin can deliver research and development activities fulfilling the Crédit Impôt Recherche criteria to its customers. This means that Bootlin customers in France can now integrate the cost of Bootlin engineering services that correspond to research and development activities into their Crédit Impôt Recherche and receive a tax incentive corresponding to up to 30% of the cost of our engineering services.

More in Tux Machines

Programming Leftovers

  • C: sigprocmask Function Usage

    You may have heard about socket programming in C. One of the socket functions is the “sigprocmask” function. This function has been usually utilized in the code to inspect or alter the signal mask of the calling function. The signal mask is a term used for a group of signals that are presently blocked and cannot be conveyed for the calling function. Such kind of signal is known as “Blocked Signals.” You can say that a process can still receive the blocked signals, but it will not be used until they are unblocked and released, i.e., raised. Until then, it will be pending. Therefore, within today’s guide, we will be discussing the use of the sigprocmask function in C programming. Let’s have a start. After the Ubuntu 20.04 successful login, you need to launch the shell of the Ubuntu 20.04 system first after the login. So, try out the “Ctrl+Alt+T” shortcut simply on the desktop screen. It will launch the terminal shell for you in some seconds. Make sure to update your system using the apt package of your system. After that, you have to execute the “touch” instruction along with the file name you want to generate, i.e., to create the C file via the shell. This newly created file can be found in the “home” folder of your system’s file explorer. You can try opening it with the “text” editor to create code in it. Another way to open it in the shell is using the “GNU Nano” editor using the “nano” keyword with a file name as demonstrated beneath.

  • C: sigaction function usage

    A sigaction() is a function that allows to call/observe or examine a specific action associated with a particular signal. It is thought to consider a signal and sigaction function on the same page. But in reality, it has not occurred. The signal() function does not block other signals when the current handler’s execution is under process. At the same time, the sigaction function can block other signals until the current handler has returned.

  • delegation of authority from the systems programming perspective – Ariadne's Space

    As I have been griping on Twitter lately, about how I dislike the design of modern UNIX operating systems, an interesting conversation about object capabilities came up with the author of musl-libc. This conversation caused me to realize that systems programmers don’t really have a understanding of object capabilities, and how they can be used to achieve environments that are aligned with the principle of least authority. In general, I think this is largely because we’ve failed to effectively disseminate the research output in this area to the software engineering community at large — for various reasons, people complete their distributed systems degrees and go to work in decentralized finance, as unfortunately, Coinbase pays better. An unfortunate reality is that the security properties guaranteed by Web3 platforms are built around object capabilities, by necessity – the output of a transaction, which then gets consumed for another transaction, is a form of object capability. And while Web3 is largely a planet-incinerating Ponzi scheme run by grifters, object capabilities are a useful concept for building practical security into real-world systems. Most literature on this topic try to describe these concepts in the framing of, say, driving a car: by default, nobody has permission to drive a given car, so it is compliant with the principle of least authority, meanwhile the car’s key can interface with the ignition, and allow the car to be driven. In this example, the car’s key is an object capability: it is an opaque object, that can be used to acquire the right to drive the car. Afterwards, they usually go on to describe the various aspects of their system without actually discussing why anybody would want this.

  • Pip Install: Install and Remove Python Packages
  • A dog-cat-horse-turtle problem

    Sometimes the text-processing problems posted on Stack Exchange have so many solutions, it's hard to decide which is best. A problem like that was posted in the "Unix & Linux" section in December 2021...

Istio / Announcing Istio 1.12.2

This release fixes the security vulnerability described in our January 18th post, ISTIO-SECURITY-2022-001 as well as a few minor bug fixes to improve robustness. This release note describes what’s different between Istio 1.12.1 and Istio 1.12.2. Read more Also: ISTIO-SECURITY-2022-001

Android Leftovers

Redis vs. MongoDB: What you need to know

Databases are garnering a lot of popularity every day and are used by many organizations for a wide variety of use cases. Many organizations are employing innovative techniques to handle their data storage. These companies often shift between databases to optimize their storage and data mapping according to their business needs. Companies with growing data requirements utilize databases with dynamic functionalities. However, deciding which database is perfect for each of these companies can be very subjective. When it comes to database management, choosing between Redis and MongoDB can be relatively challenging. Read more