this post was submitted on 05 Jul 2023
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I know that the RAM cache is just taking advantage of otherwise free RAM and will be dropped in favor of anything else, but it does stress me out a bit to see it "full" like that.
It’s free real estate!
If you had this much buffer memory what are the reasons to have swap space as well?
With my servers I’m paranoid having swap enabled will inadvertently slow stuff down. Perhaps there’s a reason to have it that I’m unaware of?
Many programs do stuff once during startup that they never do again, sometimes creating redundant data objects that will never get accessed in the configuration its being run in. Eventually the kernel memory manager figures out that some pages are never used but it can't just delete them. If swap is enabled it can swap them to disk instead. It frees up that RAM for something more important. It's usually minor but every few MB helps.