Additional zram + swap tuning

2026-07-27 09:48:20 -04:00
parent c7f7e837b2
commit 72dfbb43cd
3 changed files with 24 additions and 17 deletions
@@ -1,19 +1,9 @@
-# Compressed swap in RAM, sized the way Fedora has shipped it since F34: all of
-# memory, capped at 8G. Fedora weighed the worry that incompressible pages would
-# tie up RAM against five years of desktops reporting no trouble from it, which
-# is more field evidence than we could gather on our own.
-#
-# The cap is what bounds the downside. A browser-heavy desktop can drive zstd
-# down near 1.1:1, where the device backs far less than it advertises, and 8G
-# keeps that bounded on any machine large enough to notice. The disk swapfile
-# sits behind it at pri=0 for everything past that.
-#
-# Fedora spells this zram-fraction = 1.0 with max-zram-size = 8192; both keys
-# are deprecated in favour of zram-size, which computes the same numbers.
+# Compressed swap in RAM. zstd averages around 3:1, so even a full device
+# occupies roughly a third of RAM. Any smaller cap spills reclaim to the disk
+# swapfile, which on encrypted installs pages back through LUKS.
 [zram0]
-zram-size = min(ram, 8192)
+zram-size = ram
 compression-algorithm = zstd

-# Above the pri=0 that omarchy-hibernation-setup gives the disk swapfile, so
-# zram absorbs everything until it's full.
+# Above the pri=0 that omarchy-hibernation-setup gives the disk swapfile.
 swap-priority = 100