md /tmp and async mounts

[Craig Boston]

On Fri, Jun 02, 2006 at 12:35:27AM +0300, Giorgos Keramidas wrote:
> Ok, I'll prepare a patch that enables async and disables -M.  We should
> also document the fact that tmpmfs="YES" and varmfs="YES" in rc.conf may
> require the presence of at least one swap device by default, and point
> the users to -M with a warning if they run FreeBSD without a swap device
> but still want to use tmpmfs or varmfs :)

I may be mistaken, but from my (brief) reading of the code it seems to
me that perhaps "swap-backed" isn't an entirely accurate term.  More
like "VM-backed", with the understanding that VM is (usually) backed by
swap.

I think if you don't have any swap configured, a swap-backed md will be
no worse off than a memory-backed one would.

Craig