KVM enable memory page merging
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1 intro
It is easy to enable kvm. However, the defaults are fairly conservative.
1.1 howto enable
vi /etc/rc.local
# ksm page merging, default 0 echo 1 > /sys/kernel/mm/ksm/run # pages to scan on each run, default: 100 echo 1000 > /sys/kernel/mm/ksm/pages_to_scan # time to sleep after each scan, default: 200 echo 20 > /sys/kernel/mm/ksm/sleep_millisecs
chmod +x /etc/rc.d/rc.local
1.2 load tuning
free -t | grep ^Mem: | awk '{print $7/1024 " MB"}' top # sort for cpu with "P" and look for ksmd