Jan Panteltje wrote:

> top shows:
>
> MiB Mem :   3906.0 total,     71.6 free,    375.9 used,   3458.6 buff/cache
> MiB Swap:    100.0 total,     19.9 free,     80.1 used.   3364.1 avail Mem
>
> kernel claims all memory space as cache

You have that backwards.

 From your 3906 MB, 375 MB is used, the kernel is keeping 71 MB free for
immediate needs, that leaves 3458 MB that would be unused, so it
temporarily gets used for caching, if the 71 MB is used up, the cache
will be lowered and that memory become available for use ... no point in
letting memory be unused when they system can benefit from using it as
cache.

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