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On devices with small amounts of RAM, zram-swap fails to initialise due to the default compression algorithm (lzo-rle). Startup example on an AirGrid M2, with 32 MiB of RAM: root@airgrid:/etc/config# /etc/init.d/zram start zram_start: activating '/dev/zram0' for swapping (13 MegaBytes) zram_reset: enforcing defaults via /sys/block/zram0/reset sh: write error: Out of memory mkswap: image is too small swapon: /dev/zram0: Invalid argument root@airgrid:/etc/config# Fix this by defaulting to traditional lzo, which works fine and is always available. Signed-off-by: Rui Salvaterra <rsalvaterra@gmail.com>