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zram-swap: default to lzo instead of lzo-rle compression

Message ID 20200730124917.199164-1-rsalvaterra@gmail.com
State Accepted
Headers show
Series zram-swap: default to lzo instead of lzo-rle compression | expand

Commit Message

Rui Salvaterra July 30, 2020, 12:49 p.m. UTC
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

Fix this by defaulting to traditional lzo, which works fine and is always

Signed-off-by: Rui Salvaterra <rsalvaterra@gmail.com>
 package/system/zram-swap/files/zram.init | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)


Jo-Philipp Wich Sept. 17, 2020, 8:29 a.m. UTC | #1
Merged into my staging tree at

Thank you!
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diff --git a/package/system/zram-swap/files/zram.init b/package/system/zram-swap/files/zram.init
index f31a87438c..a42f019d92 100755
--- a/package/system/zram-swap/files/zram.init
+++ b/package/system/zram-swap/files/zram.init
@@ -85,8 +85,9 @@  zram_comp_algo()
 	local dev="$1"
 	local zram_comp_algo="$( uci -q get system.@system[0].zram_comp_algo )"
-	if [ -z "$zram_comp_algo" ] || [ ! -e /sys/block/$( basename $dev )/comp_algorithm ]; then
-		return 0
+	if [ -z "$zram_comp_algo" ]; then
+		# lzo-rle fails on small RAM devices, default to lzo, which is always available
+		zram_comp_algo="lzo"
 	if [ $(grep -c "$zram_comp_algo" /sys/block/$( basename $dev )/comp_algorithm) -ne 0 ]; then