We have installed Jetpack 4.2.3 on jetson nano. This has created a 2GB bulit in swap memory. We want to increase this. How is it done?
The 2GB swap memory that it created by default is zram, so it uses compression to store pages in memory. It is recommended to keep the zram-to-memory ratio at 1:2 (i.e. 1/2 of RAM). However, you could edit this behavior in the startup script found at /etc/systemd/nvzramconfig.sh, or by manually using mkswap/swapon with the /dev/zram* files (which is what the nvzramconfig script does internally).
If you require more swap, you may want to mount additional disk-based swap instead of zram, like on an SSD for example. To do that, you can follow this guide for mounting a swap file: https://support.rackspace.com/how-to/create-a-linux-swap-file/
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How can we remove zram completely and add swap file?
Hi razackkpa,
There is a convenient script here that you can use for reference: installSwapfile/installSwapfile.sh at master · JetsonHacksNano/installSwapfile · GitHub, its usage is explained in: Jetson Nano - Use More Memory! - JetsonHacks
You donât need to remove zram to add a swap file. Just follow dusty_nvâs link to install a normal swap partition in addition. If security is a priorty, to add a new encrypted swap file, please follow these instructions after installing cryptsetup with sudo apt install cryptsetup:
An unencrypted swap file will perform very slightly better, but there are security risks associated, especially if the disk on which the swap partition is located is removable (eg. sd card or external ssd).
We have added swap file following instruction from Jetson Nano - Use More Memory! - JetsonHacks.
Its working fine with older version of jetpack. Jetpack 4.2.3 has a built in 2GB zram and if we create swap the priority is still zram. As you suggested we do not need to remove zram. Please tell us how to prioritize swap so that the system takes swap before taking zram.
Any help possible?
Disabled zram by removing nvzramconfig.sh from /etc/systemd/ and zram is not invoked when the system boots
If you Google, you can find how to set swap priority. you can check what the priority is with the swapon command and set it persistently with a mount option in /etc/fstab. Fwiw you might not want to prioritize disk swap over zram because disk swap is going to be slower.
You should be able to just use systemctl to disable the unit rather than delete the script. The systemctl command will list all units. You should be able to find the zram service easily in the list (or grep for it) and then just âsystemctl disable servicenamehereâ
@mdegans Your generalized âhalf of the puzzle techie replyâ is not a (straightforward) answer: you do make any upcoming readers/repliers feel rather uneasy. Normally I would fully agree to use the systemctl command. In addition, you do know at this point you make several assumptions that there is a service available⊠so which one is it⊠see list below.
@razackkpa Thank you for your answer and straightforward solution!
Use the following command line to list all available âservicesâ: systemctl list-units
These are currently available on my Jetson Nano node:
alsa-restore.service loaded active exited Save/Restore Sound Card State
apport.service loaded active exited LSB: automatic crash report generation
automagic-fan.service loaded active running Automagic fan control
avahi-daemon.service loaded active running Avahi mDNS/DNS-SD Stack
console-setup.service loaded active exited Set console font and keymap
containerd.service loaded active running containerd container runtime
cron.service loaded active running Regular background program processing daemon
dbus.service loaded active running D-Bus System Message Bus
docker.service loaded active running Docker Application Container Engine
getty@tty1.service loaded active running Getty on tty1
grub-common.service loaded active exited LSB: Record successful boot for GRUB
haveged.service loaded active running Entropy daemon using the HAVEGE algorithm
jetson_performance.service loaded active exited Jetson performance is a script to control jetson_clock
jetson_stats_boot.service loaded active exited Setup fan at startup
k3s-agent.service loaded active running Lightweight Kubernetes
kerneloops.service loaded active running Tool to automatically collect and submit kernel crash signatures
keyboard-setup.service loaded active exited Set the console keyboard layout
kmod-static-nodes.service loaded active exited Create list of required static device nodes for the current kernel
ModemManager.service loaded active running Modem Manager
networkd-dispatcher.service loaded active running Dispatcher daemon for systemd-networkd
networking.service loaded active exited Raise network interfaces
NetworkManager.service loaded active running Network Manager
nv-l4t-usb-device-mode.service loaded active exited Configure USB flashing port for device mode
nvargus-daemon.service loaded active running Argus daemon
nvgetty.service loaded active running UART on ttyTHS0
nvmemwarning.service loaded active running Display Low memory warning
nvphs.service loaded active running PHS daemon
nvs-service.service loaded active running NVS-SERVICE Embedded Sensor HAL Daemon
packagekit.service loaded active running PackageKit Daemon
polkit.service loaded active running Authorization Manager
resolvconf.service loaded active exited Nameserver information manager
rpcbind.service loaded active running RPC bind portmap service
rsyslog.service loaded active running System Logging Service
serial-getty@ttyGS0.service loaded active running Serial Getty on ttyGS0
serial-getty@ttyS0.service loaded active running Serial Getty on ttyS0
setvtrgb.service loaded active exited Set console scheme
snapd.seeded.service loaded active exited Wait until snapd is fully seeded
speech-dispatcher.service loaded active exited LSB: Speech Dispatcher
ssh.service loaded active running OpenBSD Secure Shell server
systemd-fsck@dev-sda1.service loaded active exited File System Check on /dev/sda1
systemd-journal-flush.service loaded active exited Flush Journal to Persistent Storage
systemd-journald.service loaded active running Journal Service
systemd-logind.service loaded active running Login Service
systemd-modules-load.service loaded active exited Load Kernel Modules
systemd-random-seed.service loaded active exited Load/Save Random Seed
systemd-remount-fs.service loaded active exited Remount Root and Kernel File Systems
systemd-resolved.service loaded active running Network Name Resolution
systemd-sysctl.service loaded active exited Apply Kernel Variables
systemd-timesyncd.service loaded active running Network Time Synchronization
systemd-tmpfiles-setup-dev.service loaded active exited Create Static Device Nodes in /dev
systemd-tmpfiles-setup.service loaded active exited Create Volatile Files and Directories
systemd-udev-trigger.service loaded active exited udev Coldplug all Devices
systemd-udevd.service loaded active running udev Kernel Device Manager
systemd-update-utmp.service loaded active exited Update UTMP about System Boot/Shutdown
systemd-user-sessions.service loaded active exited Permit User Sessions
ubuntu-fan.service loaded active exited Ubuntu FAN network setup
user@1000.service loaded active running User Manager for UID 1000
whoopsie.service loaded active running crash report submission daemon
wpa_supplicant.service loaded active running WPA supplicant
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$ grep -r zram /etc/systemd/system
/etc/systemd/system/nvzramconfig.service:ExecStart=/etc/systemd/nvzr
amconfig.sh
So systemctl disable nvzramconfig
Sorry if my reply wasnât adequate. Iâm better with machines than with people and it wasnât my intent to make you feel uneasy. :(
So, just to provide some options, these also work to find a unit if anybody finds this useful:
$ systemctl list-unit-files | grep zram
nvzramconfig.service enabled
$ systemctl list-unit-files *zram*
UNIT FILE STATE
nvzramconfig.service enabled
1 unit files listed.
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Thank you! Clear and very concise. Much appreciated!
Is there any way to give back the swap space to the main / partition?
For example, under root / if I have 2 GB available. Iâd like to permanently relinquish my 4GB of swap to the root partition so it now has 6GB (2GB from before + 4GB from what used to be swap).
I tried both resizing the swap and disabling systemctl nvzramconfig. These did resize/disable swap but itâs like the space disappeared instead of being given back to root /.
Is there any way to give back the swap space to the main / partition?
Hi rakshak.talwar,
Please help to open a new topic for your issue. Thanks