NInisa·Nov 9, 2021
As long as you have only spinning rust for swap I disable it. After reading that article some time ago I tried to add a little swap to my shared general purpose machines (running quite a mixed workload that sometimes tends to explode e.g. matrix synapse is famous for that) and the box still grinded into an unresponsive state even with just 4GB swap. Maybe I did something wrong - But I'd rather tolerate an OOM kill (mostly contained by cgroups/container/lxd) and a few seconds (or minutes) of unresponsiveness instead of a complete lockup that results in a hard reset. Not sure if it's better on SSD. I've enabled zswap for 1/8 of memory on the Desktop and this seems to improve things but as long as you have spinning rust or other slow storage my experience is that the machine will die a slow death as long as swap is active.
There is some inte
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resting stuff in newer kernels - like multigenerational mru [1] and that le9 patchset [2]
Am I missing something? If you have full control over the memory usage this might be useful for the mentioned usecase but for a general purpose machine this doesn't work?
1: https://patchwork.kernel.org/project/linux-mm/cover/20210818...
2: https://github.com/hakavlad/le9-patch