Ask Noah Show 509

This week Steve gives us a deep dive into performance tuning, and we talk about how your body's memory functions. -- During The Show -- 00:50 Intro Subsisting greeting variables Accessible memory Strength of memory Reading and writing builds "Accessible memory" Teaching builds "Strength of memory" Go look up "space repetition" Reader come home book YouTube if you check their sources 17:55 News Wire OpenSSL Security Update - github.com Git 2.56 - github.blog Thunderbird 157 - thunderbird.net Firefox 157 firefox.com - firefox.com Shotcut 26.9 - phoronix.com Tails 7.14 - torproject.org Parrot OS 7.4 - parrotsec.org OpenMandriva ROME 26.09 - openmandriva.org Nitrux 7.0 - opensourcefeed.org Antix 26.1 - antixlinux.com SMTP Backdoors - infosecurity-magazine.com COSMIC Desktop No Longer Accepts AI Content - reddit.com Beam AI - fortune.com Google Halts Open Source Bug Bounty Program - bleepingcomputer.com 19:15 Performance Tuning Defaults are someone guessing at a "safe option" Three hosts being tuned NAS (file server) vHost (virtual disks live here) Container Host When should you performance tune? Broadcasting Networks (ISPs) The more "dense" the more benefits TuneD ZFS "Adaptive Replacement Cache" (ARC) Default is 50% of RAM Swap file System doesn't empty on its own ARC stats Hits and misses Resets on reboot Memory pressure Swapyness 60 is the default the "cliff rate" Tuned to around 10%-30% on "performance profiles" System starts swapping before you hit zero RAM ZFS record size Record size is the "Maximum" not "Fixed size" Media Library 1M Postgres 16K ZFS write amplification (8k writes to 1M records hurt) AI study bot rules Man systemd.directives Write in and tell us if you want more! Extra Credit: What to search after the show ZFS ARC Tuning ZFS Record Size ZFS send receive preserves record size Record size is per "data set" not directory Record size only affects new writes "zfs_dirty_data_max" vs "vm.dirty_ratio" "QEMU "cache=none" O_DIRECT" Postgres on NFS PGDATA caveats "Tuned-adm virtual-host" hypervisor profile (The one nobody mentions) Tuned profile format "sysctl" vs "main" the plugin/argument split NFS mount options (the client side fix) "vmstat" reading swap columns correctly -- The Extra Credit Section -- For links to the articles and material referenced in this week's episode check out this week's page from our podcast dashboard! This Episode's Podcast Dashboard Phone Systems for Ask Noah provided by Voxtelesys Join us in our dedicated chatroom #GeekLab:linuxdelta.com on Matrix -- Stay In Touch -- Find all the resources for this show on the Ask Noah Dashboard Ask Noah Dashboard Need more help than a radio show can offer? Altispeed provides commercial IT services and they’re excited to offer you a great deal for listening to the Ask Noah Show. Call today and ask about the discount for listeners of the Ask Noah Show! Altispeed Technologies Contact Noah live [at] asknoahshow.com -- Twitter -- Noah - Kernellinux Ask Noah Show Altispeed Technologies Support Ask Noah Show