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Document remaining neon customizations from shell history; fix zram loose ends

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Persist vm.swappiness=100 in /etc/sysctl.d/99-zram.conf and delete the
unused /swapfile. New NEON-CUSTOMIZATIONS.md covers keyd, USB-C DP
modules, HWE-edge kernel, tmpfs /tmp and localepurge, r8152 DKMS
history, tailscale, and third-party repos/tools.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
ergosteur
2026-09-27 13:08:43 -04:00
co-authored by Claude Opus 5.5
parent 637dd035cc
commit 7b64fdb539
3 changed files with 178 additions and 18 deletions
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ZRAM.md
+11 -16
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@@ -56,22 +56,17 @@ zram-related on the kernel command line.
4. **Raised `vm.swappiness` to 100**, at runtime only
(`sudo sysctl vm.swappiness=100`). See the loose ends below.
## Loose ends (as of 2026-09-27)
## Loose ends (fixed 2026-09-27)
- **`vm.swappiness=100` was never made persistent.** It's back to the
default **60** now: no `swappiness` line in `/etc/sysctl.conf`,
`/etc/sysctl.d/` or `/usr/lib/sysctl.d/`. To keep it (a common choice
with zram-only swap, since swapping to zram is cheap):
```
echo 'vm.swappiness=100' | sudo tee /etc/sysctl.d/99-zram.conf
sudo sysctl --system
```
Some zram guides also set `vm.page-cluster=0` (currently `3`), because
zram has no seek cost and readahead just wastes work.
- **`/swapfile` still exists**: 512MiB, `root:root 0600`, dated
2026-03-04. It's unused since its fstab line is commented out. Remove
it with `sudo rm /swapfile` to get the space back, or keep it as a
low-priority fallback.
- **`vm.swappiness=100` hadn't been made persistent**: it had been set
with `sysctl` at runtime only and was back to the default 60. Now
persisted in `/etc/sysctl.d/99-zram.conf` (`vm.swappiness=100`) and
applied live. Swapping to zram is cheap, so a high swappiness is the
usual choice. Not changed: `vm.page-cluster` (still `3`). Some zram
guides set it to `0`, since zram has no seek cost and readahead just
wastes work.
- **The unused `/swapfile`** (512MiB, dated 2026-03-04, fstab line
commented out) was deleted.
## Reapplying on a fresh neon install
@@ -86,7 +81,7 @@ EOF
sudo systemctl enable --now zramswap
# comment out any /swapfile line in /etc/fstab, then:
sudo swapoff /swapfile
# optional: persist swappiness
# persist swappiness
echo 'vm.swappiness=100' | sudo tee /etc/sysctl.d/99-zram.conf && sudo sysctl --system
```