Cache is reset without reaching configured limit #188
Description
Is there an existing issue for this?
- I have searched the existing issues
Current behaviour
just observed with knots 29.1 while in IBD: The cache is flushed often without reaching the configured limit.
relevant message from debug.log:
2025-09-13T13:31:39Z SystemNeedsMemoryReleased: YES: 60604416 free RAM + 2818048 buffer RAM
RAM usage is only ~1500MB of 4000MB no other programs opened, swap disabled
does not happen with knots 28.1 .
Let me know if more information is needed from my side.
Expected behaviour
cache should be used as configured, except no more memory available.
i also observed that with cache configured to 400MiB it flushes only after reaching ~667MiB
Steps to reproduce
download binaries for knots 29.1 (aarch64) from bitcoin knots website and start bitcoin-qt.
Relevant log output
How did you obtain Bitcoin Knots
Pre-built binaries
What version of Bitcoin Knots are you using?
Bitcoin Knots version v29.1.knots20250903
Operating system and version
Debian 12 (Raspberry Pi OS 64bit)
Machine specifications
Raspberry Pi 5 - 4GB
Kingston M.2 SSD 500GB via pci-e
wired gigabit connection