/etc/default/qemu-kvm is in qemu-system-common 1:2.5+dfsg-5ubuntu10.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 | # Set to 1 to enable KSM, 0 to disable KSM, and AUTO to use default settings.
# After changing this setting restart the qemu-kvm service.
KSM_ENABLED=AUTO
SLEEP_MILLISECS=200
# To load the vhost_net module, which in some cases can speed up
# network performance, set VHOST_NET_ENABLED to 1.
VHOST_NET_ENABLED=0
# Set this to 1 if you want hugepages to be available to kvm under
# /run/hugepages/kvm
KVM_HUGEPAGES=0
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