https://www.kernel.org/doc/Documentation/blockdev/zram.txt
"num_devices parameter is optional and tells zram how many devices should be pre-created. Default: 1" The whole first procedure is a question to why and completely fails to check previous devices or modprobe zram services:- ******************************************************************* # load dependency modules if grep ZRAM=m /boot/config-$(uname -r) NRDEVICES=$(grep -c ^processor /proc/cpuinfo | sed 's/^0$/1/') if modinfo zram | grep -q ' zram_num_devices:' 2>/dev/null; then MODPROBE_ARGS="zram_num_devices=${NRDEVICES}" elif modinfo zram | grep -q ' num_devices:' 2>/dev/null; then MODPROBE_ARGS="num_devices=${NRDEVICES}" else exit 1 fi modprobe zram $MODPROBE_ARGS fi ***************************************************************** zram can be easily checked to see if it has a sys class ZRAM_SYS_DIR='/sys/class/zram-control' if [ ! -d "${ZRAM_SYS_DIR}" ]; then if not then modprobe zram will create it. So after a modprobe zram all you have to do is create first device /dev/zram0 As cat /sys/class/zram-control/hot_add will always contain the next device number and will already contain '1' After that RAM_DEV=$(cat /sys/class/zram-control/hot_add) echo ${COMP_ALG_SWAP} > /sys/block/zram${RAM_DEV}/comp_algorithm echo ${mem} > /sys/block/zram${RAM_DEV}/disksize mkswap /dev/zram${RAM_DEV} swapon -p ${SWAP_PRI} /dev/zram${RAM_DEV} is all that is needed as cat /sys/class/zram-control/hot_add is incremented on each addition But then we have the questions of if a single device is automatically allocated streams for all cores why add a block device for each core? Also zram can use all crypto listed in proc/crypto but its hard coded. Same for swap priority & size setting. There is little correlation in the methods used in zram-config & https://www.kernel.org/doc/Documentation/blockdev/zram.txt and maybe someone should ask why? -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1270913 Title: zram-config doesn't start if zram is built-in, not module To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/zram-config/+bug/1270913/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs