Untitled Linux Show 245

High-level summary

This document summarizes topics, technical details, product updates, benchmarks, and practical tips covered in the episode.

Calibre 9.5

• New features:
  • edit-book tool can remove unused images.
  • Option to display paperbook page list with last page number.
  • Reset button for the reading stats panel (reading stats first appeared in 9.4).
  • New custom column to show reading progress.
  • Improved annotations browser (filter by highlight style).
• Notes:
  • Read the official release notes and the authors’ blog posts for full bug-fix details.
  • Calibre can run as a server (to serve e‑readers/tablets) or be used over USB to manage mobile devices.

GIMP 3.2

• Major highlights:
  • Non‑destructive layers (move toward a non‑linear, undoable workflow).
  • Paintbrush tool improvements.
  • SVG export support.
  • General UI/UX polishing.
• Expectation: faster cadence of subsequent releases after GIMP 3.0’s long gestation.

Filesystem benchmarks (kernel 7.0 and historical comparison)

• Testbed: heavy system (AMD EPYC 9745).
• Filesystems compared: XFS, ext4, F2FS, Btrfs (stock and with copy‑on‑write toggled).
  • XFS scored best overall.
  • ext4 was a close second.
  • F2FS performed midpack.
  • Btrfs lagged in many tests.
• Follow-up: ext4 vs XFS across kernel releases back to 6.12 showed ext4 gained notable performance around kernel 6.16 (reducing the gap with XFS).
• Exclusions: Bcachefs and OpenZFS excluded until compatible with kernel 7.0.
• Takeaway: raw speed matters less for most home users than stability and features — stick with distro defaults unless you have a specific workload.

Kernel API specification (machine-readable proposal)

• A machine‑readable kernel API specification is progressing beyond RFC stage.
• Contents include parameter types, ranges, alignment, error codes, and constraints.
• Accompanied by a KUnit test suite and runtime verification.
• Benefits:
  • Single authoritative source for user‑space bindings.
  • Better documentation and reduced accidental user‑space breakage.
  • Easier tooling generation and implications for AI-assisted code generation.

HandBrake 1.11

• New container/codec support:
  • Updated MOV/MP4 container handling.
  • DNxHR and ProRes encoders added (pro video workflows).
• AV1 improvements:
  • AMD VCN AV1 10‑bit encoder.
  • 4K preset targeting Radeon RX 9000 series.
• Audio:
  • PCM encode/pass-through.
  • Custom channel ordering (useful for multi‑channel or multi‑track exports).
• Usability:
  • GTK file launcher integration for sandboxed environments (Flatpak).
  • Preview navigation buttons.
  • UI language switching and updated locales.

KeePassXC 2.7.12

• Import improvements: nested folder support for Bitwarden imports.
• Added TOTP/time‑OTP support and autotype/entry placeholder improvements.
• Passkey flags (BE/BS) support.
• Fixes addressing OpenSSL exploit vectors and other bugs.
• Practical: improved handling for 2FA (TOTP) and more robust import workflows.

RISC‑V / RiskFive (Fedora build issues)

• Fedora engineer reported slow builds on RISC‑V hardware compared to ARM64 and x86_64 (e.g., binutils builds much slower).
• Reasons:
  • Many current RISC‑V boards prioritize performance‑per‑watt rather than raw throughput.
  • Instruction‑set fragmentation and lack of standardized performance extensions complicate distro optimizations.
• Outlook: upcoming higher‑performance boards (e.g., MilkFive/Titan with up to 64 GB RAM) may change the situation.

systemd v260 (RCs) and AI-related docs

• Major notes:
  • Removal of legacy SysV init script support (long deprecated).
  • New MStack feature — structured overlay filesystem / bind mount management for complex container/service root setups.
  • Raised dependency baselines (OpenSSL, Python, kernel minimums); full functionality may require kernel 6.6+.
• AI-focused additions:
  • Project-level AI agent guidance files (agents.mmd), claude.md, and a claude review YAML to help AI tools produce code/reviews aligned with systemd development.
  • Recommendation for AI disclosures on patches (co‑written tags).
• Intent: guide and limit low‑quality AI patches and make AI assistance produce better-aligned contributions.

TrueNAS build scripts closure

• iX Systems moved public build scripts/internal build infrastructure out of their public GitHub repo as part of a secure‑boot revamp.
• Reasons cited:
  • Commercial abuse (forks/reselling without complying with GPL or returning contributions).
  • Legal difficulties enforcing license in some regions.
  • Engineering reasons tied to secure‑boot refactor and build infrastructure changes.
• Impact:
  • Free features remain free, according to iX Systems.
  • Community members lose some ability to reproduce/build the latest TrueNAS from source.
  • Open‑source purists raise concerns about transparency and reproducibility.

Security mitigations and CPU performance

• Benchmarks (including Panther Lake Core Ultra X7 358H and multiple laptop CPU generations) show modern CPU generations often have negligible performance differences with mitigations enabled vs disabled for many workloads.
• Some workloads (specific database tests, raw photo processing) still show measurable differences.
• Conclusion: on current-generation hardware, disabling mitigations for performance is rarely worthwhile; older CPU generations may still benefit.

Practical tips, scripts, and small tooling

• ArchDeckify:
  • GitHub script to configure an Arch‑based system with a SteamOS-like gaming experience (KDE Plasma recommended, SDDM, gamepad-focused UI).
  • Useful for Steam‑Deck-style PC setups or HTPCs.
• Command-line tips:
  • udevadm info –query=all /dev/… — inspect udev device attributes, IDs, serials, and symlink paths (helpful when debugging udev rules and drive issues).
  • Bash reverse search (Ctrl+R) — interactive reverse search through shell history (type a substring and keep Ctrl+R to cycle; Escape/Ctrl+C to cancel).
• Hardware mention: Google Titan security key (FIDO2 / WebAuthn / FIDO U2F compatible) — inexpensive and useful for account security.

Business and industry notes

• SUSE ownership:
  • Owned by private equity firm EQT and reportedly being shopped for sale.
  • Valuation talk in the multi‑billion USD/euro range; possible suitors were speculated (Microsoft, Amazon, Intel, large European industrials, SAP, etc.) — speculative discussion.
• Semiconductor context:
  • Shortages persist because fab setup time, tool costs, and the need to run fabs continuously make capacity expansion slow and expensive.

Reviews, guides, and how‑tos mentioned

• Recommended reading:
  • Release notes and author posts for Calibre 9.5 and HandBrake 1.11 for full change lists and bug fixes.
  • Try GIMP 3.2’s non‑destructive layers and SVG export in a test build.
• Filesystem guidance:
  • Prefer distro defaults unless you have a specific workload; consult detailed benchmarks for server/enterprise choices.
• Calibre usage:
  • Use as a server or via USB to manage tablets/phones (how‑to suggested).
• ArchDeckify:
  • Follow the GitHub install script/readme for creating a SteamOS-like setup on Arch.
• Debugging tips:
  • Use udevadm info for device attribute inspection.
  • Use Ctrl+R for quick reverse search in the shell.

Key recommendations and takeaways

• For most users, choose a filesystem that prioritizes reliability and feature set; stick with distro defaults unless you have special workload needs.
• Modern CPUs have largely mitigated the performance cost of speculative‑execution/security mitigations — don’t disable mitigations on new hardware unless you understand a specific workload benefit.
• Projects are adopting machine‑readable API specs and AI‑guidance documentation to improve tooling, documentation, and controlled AI-assisted contributions.
• TrueNAS moving build scripts out of public view is a meaningful change for reproducibility; weigh trade‑offs between protecting IP/secure‑boot builds and open‑build transparency.

Main speakers and sources

• Hosts/panelists: Jonathan (host), Ken, Jeff (regular panelists on the Untitled Linux Show).
• External sources and reporters:
  • Michael Larabel / Phoronix (kernel/filesystem and mitigation benchmarks).
  • Project release notes and blog posts for Calibre, HandBrake, KeePassXC, and GIMP.
  • TrueNAS/iX Systems CTO statements (forum/podcast posts).
  • Fedora engineer commentary on RISC‑V build performance.
  • GitHub/systemd repositories (agents.mmd / claude.md).
  • General community posts and show notes referenced by the hosts.