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ZTS: Optimize Kernel Same-page Merging (KSM)

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Kernel same-page Merging (KSM) allows KVM guests to share identical
memory pages. These shared pages are usually common libraries or other
identical, high-use data.

The current configuration was a bit to lazy - so KSM didn't work very
well. With the new configuration I could run 3 Linux VMs in parralel.

FreeBSD can't benefit from it. But FreeBSD is not so memory hungry in
general, so there is no need for it ;)

Reviewed-by: George Melikov <mail@gmelikov.ru>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Tino Reichardt <milky-zfs@mcmilk.de>
Closes #16641
This commit is contained in:
Tino Reichardt 2024-10-12 09:53:32 +02:00 committed by Brian Behlendorf
parent c642e985e5
commit e7b64159f8
2 changed files with 16 additions and 12 deletions
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16
.github/workflows/scripts/qemu-1-setup.sh vendored
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@ -18,19 +18,21 @@ ssh-keygen -t ed25519 -f ~/.ssh/id_ed25519 -q -N ""
# we expect RAM shortage # we expect RAM shortage
cat << EOF | sudo tee /etc/ksmtuned.conf > /dev/null cat << EOF | sudo tee /etc/ksmtuned.conf > /dev/null
# /etc/ksmtuned.conf - Configuration file for ksmtuned
# https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/7/html/virtualization_tuning_and_optimization_guide/chap-ksm # https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/7/html/virtualization_tuning_and_optimization_guide/chap-ksm
KSM_MONITOR_INTERVAL=60 KSM_MONITOR_INTERVAL=60
# Millisecond sleep between ksm scans for 16Gb server. # Millisecond sleep between ksm scans for 16Gb server.
# Smaller servers sleep more, bigger sleep less. # Smaller servers sleep more, bigger sleep less.
KSM_SLEEP_MSEC=10 KSM_SLEEP_MSEC=30
KSM_NPAGES_BOOST=300
KSM_NPAGES_DECAY=-50
KSM_NPAGES_MIN=64
KSM_NPAGES_MAX=2048
KSM_THRES_COEF=25 KSM_NPAGES_BOOST=0
KSM_THRES_CONST=2048 KSM_NPAGES_DECAY=0
KSM_NPAGES_MIN=1000
KSM_NPAGES_MAX=25000
KSM_THRES_COEF=80
KSM_THRES_CONST=8192
LOGFILE=/var/log/ksmtuned.log LOGFILE=/var/log/ksmtuned.log
DEBUG=1 DEBUG=1

12
.github/workflows/scripts/qemu-5-setup.sh vendored
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@ -14,17 +14,19 @@ PID=$(pidof /usr/bin/qemu-system-x86_64)
tail --pid=$PID -f /dev/null tail --pid=$PID -f /dev/null
sudo virsh undefine openzfs sudo virsh undefine openzfs
# default values per test vm:
VMs=2
CPU=2
# definitions of per operating system # definitions of per operating system
case "$OS" in case "$OS" in
# FreeBSD can't be optimized via ksmtuned
freebsd*) freebsd*)
VMs=2
CPU=3
RAM=6 RAM=6
;; ;;
*) *)
VMs=2 # Linux can be optimized via ksmtuned
CPU=3 RAM=8
RAM=7
;; ;;
esac esac