On Mon, 2007-08-13 at 15:46 +0200, Pavel Machek wrote:
> Hi!
>
> min_free_kbytes documentation says:
>
> min_free_kbytes:
>
> This is used to force the Linux VM to keep a minimum number
> of kilobytes free. The VM uses this number to compute a pages_min
> value for each lowmem zone in the system. Each lowmem zone gets
> a number of reserved free pages based proportionally on its size.
>
> ....which is not too helpful :-(. In particular, should kernel survive
> setting this to 0 and still work reliably? IOW is this
> performance-only tweak, or does it correctness implications?
correctness
sort-of, since PF_MEMALLOC usage is currently un-bounded.
> I guess it should also say something like "do not set this to more
> than half of your physical RAM (or half of lowmem?) or you get an
> instant OOM".
yeah, lowmem, not sure on the oom part, it should work with quite high
limits, although I've never tried it with ridiculous numbers.
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