Show Notes
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 --
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