I have a swap file and zram configured without specifying priority. The swap file was assigned -2, and zram -3, with the effect that zram was never used. I had to manually change the zram priority to something higher that that of the swap file.
The manual wrongly claims that the default priority for zram is -1. The same paragraph of the manual also says: ‘swapon’ accepts values between -1 and 32767, with higher values indicating higher priority. which makes the -2 priority of the swap file look suspect (though it seems to work).
