> From: zfs-discuss-boun...@opensolaris.org [mailto:zfs-discuss-
> boun...@opensolaris.org] On Behalf Of Nico Williams
> As for swap... really, you don't want to swap. If you're swapping you
> have problems.
For clarification, the above is true in Solaris and derivatives, but it's not
universally true for all OSes. I'll cite linux as the example, because I know
it. If you provide swap to a linux kernel, it considers this a degree of
freedom when choosing to evict data from the cache, versus swapping out idle
processes (or zombie processes.) As long as you swap out idle process memory
that is colder than some cache memory, swap actually improves performance. But
of course, if you have any active process starved of ram and consequently
thrashing swap actively, of course, you're right. It's bad bad bad to use swap
In solaris, I've never seen it swap out idle processes; I've only seen it use
swap for the bad bad bad situation. I assume that's all it can do with swap.
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