KSM Sharing
- Thread starter esra
- Start date
By default ksm sharing only starts working if RAM exceeds 80% usage. And make sure ksm is installed. Using ProxmoxVE-ISO it was installed by default but I reinstalled the system and installed Proxmox atop of Debian and ksm wasn't installed by default. I needed to manually install und enable it.
Look at the /etc/ksmtuned.conf if you can find a way to lower the activation threshold ("KSM_THRES_COEF" maybe?):
Code:
# apt-get install -y ksmtuned
# systemctl enable ksmtuned
# systemctl start ksmtuned
# systemctl enable --now ksm.serviceLook at the /etc/ksmtuned.conf if you can find a way to lower the activation threshold ("KSM_THRES_COEF" maybe?):
Code:
# Configuration file for ksmtuned.
# How long ksmtuned should sleep between tuning adjustments
# KSM_MONITOR_INTERVAL=60
# Millisecond sleep between ksm scans for 16Gb server.
# Smaller servers sleep more, bigger sleep less.
# KSM_SLEEP_MSEC=10
# KSM_NPAGES_BOOST - is added to the `npages` value, when `free memory` is less than `thres`.
# KSM_NPAGES_BOOST=300
# KSM_NPAGES_DECAY - is the value given is subtracted to the `npages` value, when `free memory` is greater than `thres`.
# KSM_NPAGES_DECAY=-50
# KSM_NPAGES_MIN - is the lower limit for the `npages` value.
# KSM_NPAGES_MIN=64
# KSM_NPAGES_MAX - is the upper limit for the `npages` value.
# KSM_NPAGES_MAX=1250
# KSM_THRES_COEF - is the RAM percentage to be calculated in parameter `thres`.
# KSM_THRES_COEF=20
# KSM_THRES_CONST - If this is a low memory system, and the `thres` value is less than `KSM_THRES_CONST`, then reset `thres` value to `KSM_THRES_CONST` value.
# KSM_THRES_CONST=2048
# uncomment the following to enable ksmtuned debug information
# LOGFILE=/var/log/ksmtuned
# DEBUG=1
It is not RAM, it's swap and it is not enough - only 8 GB for 768 GB of RAM, I would increase it tremendously (e.g. factor of 8).
Keep in mind that LXC does not support KSM per se, only QEMU does, because the memory is specially flagged as deduplicable. Please see the documentation.
