Some ideas for FreeBSD
Heiko Wundram (Beenic)
wundram at beenic.net
Fri Feb 8 17:22:43 UTC 2008
Am Freitag, 8. Februar 2008 17:54:03 schrieb millueradfa at yahoo.com:
> Well, actually, these are file backed swap devices.
> You can do both file and memory backed devices. this
> allows you to have a swap file on the hard disk and
> mount it.
As I already wrote in another part of this thread: please explain to me why it
should be faster to have a file backed md set up as swap than a dedicated
swap partition (because there's at least two more levels of indirection
I can clearly see the need for file backed swap in special cases (for example,
where you need RAM desperately, for example for a compile, but cannot add
another partition to a system), but no matter what, it will never be faster
than a swap partition. And that was what the original poster of this
sub-thread suggested (and as such, I took it that he was referring to
memory-backed mds, because file-backed mds are never faster than "raw" access
to a hard-disk).
So, I still stand by my first assessment: the idea to use an md as swap is
stupid, at least from a performance standpoint.
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