>IIRC dump is special.
>As for swap... really, you don't want to swap. If you're swapping you
>have problems. Any swap space you have is to help you detect those
>problems and correct them before apps start getting ENOMEM. There
>*are* exceptions to this, such as Varnish. For Varnish and any other
>apps like it I'd dedicate an entire flash drive to it, no ZFS, no
Yes and no: the system reserves a lot of additional memory (Solaris
doesn't over-commits swap) and swap is needed to support those
reservations. Also, some pages are dirtied early on and never touched
again; those pages should not be kept in memory.
But continuously swapping is clearly a sign of a system too small for its
Of course, compressing and/or encrypting swap has interesting issues: in
order to free memory by swapping pages out requires even more memory.
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