Dev1 Galaxy Forum / [SOLVED] Zram in 4.0 ?

Re: [SOLVED] Zram in 4.0 ?

dummy@example.com (eisabase) — Fri, 17 Jun 2022 23:31:50 +0000

Alright I got it working. I could have sworn that I set the disksize originally, but I might have gotten confused about it. Not sure what I did wrong the first time honestly. Solved!

Re: [SOLVED] Zram in 4.0 ?

dummy@example.com (Head_on_a_Stick) — Fri, 17 Jun 2022 21:27:26 +0000

Works for me:

root@devuan:~# cat /etc/devuan_version 
daedalus/ceres
root@devuan:~# modprobe -v zram
insmod /lib/modules/5.18.0-1-amd64/kernel/mm/zsmalloc.ko 
insmod /lib/modules/5.18.0-1-amd64/kernel/drivers/block/zram/zram.ko 
root@devuan:~# file /dev/zram0
/dev/zram0: block special (253/0)
root@devuan:~# echo 1G>/sys/block/zram0/disksize 
root@devuan:~# mkswap /dev/zram0
Setting up swapspace version 1, size = 1024 MiB (1073737728 bytes)
no label, UUID=0b9792b3-e7ce-4b5e-84f7-2f4dc3247db2
root@devuan:~# swapon /dev/zram0
root@devuan:~# cat /proc/swaps
Filename            Type      Size      Used      Priority
/dev/zram0        partition   1048572      0      -2
root@devuan:~#

If you have errors post them here in full.

EDIT: zram-tools is installed but udisks2-zram is not.

EDIT2: and yes, it also works in chimaera. I tried it there first then brought the system up to daedalus to confirm the 5.18 kernel also works.

[SOLVED] Zram in 4.0 ?

dummy@example.com (eisabase) — Fri, 17 Jun 2022 20:46:32 +0000

I was looking up if zram was avaliable in 4.0. I found something that said it wasn't available in 4.0 but was in earlier versions, but I don't understand why. So far I found.

1. There is a zram kernel object present in the default system.
2. regardless of if udisk2s-zram is installed, modprobing zram never mounts a zram disk.
3. I noticed in the sysvinit script that is provided by debian wiki, the script calls for modinfo from kmod. modinfo seems to be called with /sbin/modinfo, or it could be copied to /bin/ to make it work normally. However, modinfo always outputs an ERROR saying it's missing firmware. I read somewhere that you should install linux-headers, but this did not change/fix the error. So I'm assuming this is a separate problem.

So regardless of the modinfo bit. Why can't we just have zram working on the current kernel? Is there something hugely different in 4.0?