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power: zram swap ahead of disk swapfile for large model loads

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This commit is contained in:
Sergei Poljanski 2026-07-11 22:36:01 +04:00
commit 2eb1008ec0
Signed by: asxpi
GPG key ID: 4F8851660FA4121B
1 changed files with 11 additions and 0 deletions
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modules/power.nix
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@ -15,6 +15,17 @@
# suspend-then-hibernate so long sleeps drain to disk. # suspend-then-hibernate so long sleeps drain to disk.
boot.resumeDevice = "/dev/mapper/luks-71c97ce7-dd29-4b07-8d2a-8cc3985a65bd"; boot.resumeDevice = "/dev/mapper/luks-71c97ce7-dd29-4b07-8d2a-8cc3985a65bd";
# zram ahead of the disk swapfile: when a large LLM load pins 20-30 GiB of
# GTT, evicted app pages compress into RAM instead of contending with model
# reads on the same NVMe (this contention caused 8-minute model loads).
# Hibernate is unaffected: the image goes to resumeDevice/resume_offset
# (the swapfile), which stays available as overflow swap at priority -2.
zramSwap = {
enable = true;
memoryPercent = 50;
priority = 100;
};
# On battery: suspend-then-hibernate (s2idle then hibernate after # On battery: suspend-then-hibernate (s2idle then hibernate after
# HibernateDelaySec). Previously this looped suspend->wake->suspend due # HibernateDelaySec). Previously this looped suspend->wake->suspend due
# to ACPI EC interrupts, but acpi.ec_no_wakeup=1 (above) plus disabling # to ACPI EC interrupts, but acpi.ec_no_wakeup=1 (above) plus disabling