Martin Gregorie wrote:

> The Wikipedia article I referenced describes zram as a swap device

I think it's just a ram disc with compression, not specifically for swap

> and zswap as a cache front-ending the swap device, i.o.w. zswap can
> deal with memory over-subscription by evicting pages to an external
> swap device: zram can't do this because it IS the swap device.
>
> The Wikipedia article describes them as alternatives.

Yep.

My machine with the existing 5.9GB swap device and the new 4GB zram swap
device, certainly thinks it's got a total 9.9GB swap space now.

# free -hwt
               total        used        free      shared     buffers
    cache   available
Mem:           31Gi       2.3Gi        26Gi        45Mi       317Mi
   2.4Gi        28Gi
Swap:         9.9Gi          0B       9.9Gi
Total:         41Gi       2.3Gi        36Gi

--- SoupGate-Win32 v1.05