#VERIFICATION-XENIAL
The tunable default is now 200000 for the kernel in xenial-proposed:
ubuntu@colt:~$ cat /sys/module/kvm/parameters/halt_poll_ns 200000
ubuntu@colt:~$ uname -a Linux colt 4.4.0-117-generic #141-Ubuntu SMP Tue Mar 13 11:58:07 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
#VERIFICATION- XENIAL
The tunable default is now 200000 for the kernel in xenial-proposed:
ubuntu@colt:~$ cat /sys/module/ kvm/parameters/ halt_poll_ ns
200000
ubuntu@colt:~$ uname -a
Linux colt 4.4.0-117-generic #141-Ubuntu SMP Tue Mar 13 11:58:07 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux