i could use some help with zram id like to know if this is the file in which zram tweaks for pop os are
are made an if so what lines an values / setting can be changed to improve or
adjust zram function
what can these settings be adjusted by an to what effect
#!/bin/bash
Copyright 2022 System76 [email protected]
SPDX-License-Identifier: GPL-3.0-only
If a zram device already exists, ignore
test -b /dev/zram0 && exit 0
ENV_CONF=‘/etc/pop-zram’
Load user-defined variabls if a config exists
if test -f ${ENV_CONF}; then
export $(grep -v ‘^#’ ${ENV_CONF} | xargs)
fi
Default to compress with zstd, which has an average compression ratio of 3.37:3
test -n “${ALGO}” || ALGO=zstd
Max amount of uncompressed RAM that should be compressed.
test -n “${MAX_SIZE}” || MAX_SIZE=16384
Higher values encourage the kernel to be more eager to move pages to swap.
test -n “${SWAPPINESS}” || SWAPPINESS=90
Amount of memory to use for zram, from 1 to 200
test -n “${PORTION}” || PORTION=50
if ((PORTION > 200)); then
PORTION=200
elif ((PORTION < 1)); then
PORTION=1
fi
Number of consecutive pages to read in advance. Higher values increase compression
for zram devices, but at the cost of significantly reduced IOPS and higher latency.
It is highly recommended to use 0 for zstd; and 1 for speedier algorithms.
test -n “${PAGE_CLUSTERS}” || PAGE_CLUSTERS=$(test zstd = ${ALGO} && echo 0 || echo 1)
Total amount of memory accessible to the OS.
TOTAL=$(awk -v p=${PORTION} ‘/MemTotal/ {printf “%.0f”, p * $2 / 102400}’ /proc/meminfo)
Ensure that the size is not greater than the max size.
SIZE=$(((TOTAL > MAX_SIZE)) && echo ${MAX_SIZE} || echo ${TOTAL})
Load the zram module.
modprobe zram num_devices=1
udevadm settle -t 1
Create it with our desired size and compression algorithm
zramctl --size “${SIZE}M” --algorithm “${ALGO}” /dev/zram0
Format it as a swap partition
mkswap /dev/zram0
udevadm settle -t 1
Activate the zram device with a priority of 1000.
This device should have a higher priority than disk-based swap.
swapon -p 1000 /dev/zram0
Apply optimal sysctl values for the zram environment.
sysctl -w “vm.page-cluster=${PAGE_CLUSTERS}” “vm.swappiness=${SWAPPINESS}”
Ensure at least 1% of total memory is free to avoid system freeze.
MINIMUM=$(awk ‘/MemTotal/ {printf “%.0f”, $2 * 0.01}’ /proc/meminfo)
CURRENT=$(sysctl vm.min_free_kbytes | awk ‘{print $3}’)
if ((MINIMUM > CURRENT)); then
sysctl -w “vm.min_free_kbytes=${MINIMUM}”
fi
an were if i can do i adjust the vm.page-cluster= setting an what options
are ther an ther effects
im trying to improve the usage of my 16gb of ram which i cant upgrade anymore to my laptop
an zram seem to chew more then before
