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pkgs: libvirt-1.1.1-12.el7.x86_64 qemu-kvm-rhev-1.5.3-10.el7.x86_64 kernel-3.10.0-9.el7.x86_64 steps: 1. Add the following xml info into guest ... <memoryBacking> <nosharepages/> </memoryBacking> ... 2. Start the guest # virsh start r7q Domain r7q started # ps aux|grep r7q qemu 17219 95.8 0.0 1477604 61088 ? Sl 19:04 0:05 /usr/libexec/qemu-kvm -name r7q -S -machine pc-i440fx-rhel7.0.0,accel=kvm,usb=off,mem-merge=off -m 977 -realtime mlock=off -smp 2,maxcpus=4,sockets=4,cores=1,threads=1 -uuid f8de2e07-3fdc-5425-6c72-30d400fb0679 -no-user-config -nodefaults -chardev socket,id=charmonitor,path=/var/lib/libvirt/qemu/r7q.monitor,server,nowait -mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc -no-shutdown -device piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2 -drive file=/var/lib/libvirt/images/r7q-mjc.img,if=none,id=drive-virtio-disk0,format=qcow2 -device virtio-blk-pci,scsi=off,bus=pci.0,addr=0x7,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=1 -netdev tap,fd=23,id=hostnet0 -device rtl8139,netdev=hostnet0,id=net0,mac=52:54:00:37:28:f5,bus=pci.0,addr=0x3 -chardev pty,id=charserial0 -device isa-serial,chardev=charserial0,id=serial0 -vnc 127.0.0.1:0 -vga cirrus -device AC97,id=sound0,bus=pci.0,addr=0x4 -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x5 the mem-merge=off is added to qemu command line. remove the adding xml and restart, no mem-merge added to command line which is default to mem-merge=on After enable ksm on host: 1.echo 1 > /sys/kernel/mm/ksm/run 2.echo 50 > /sys/kernel/mm/ksm/sleep_millisecs 3.echo 5000 > /sys/kernel/mm/ksm/pages_to_scan check with steps with comments #7 in bug 769021, also works as expected.
This request was resolved in Red Hat Enterprise Linux 7.0. Contact your manager or support representative in case you have further questions about the request.