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[Openstack] live_migration only using 8 Mb speed


I am running openstack queens and hypervisor is kvm, my live migration
working fine. but somehow it stuck to 8 Mb network speed and taking
long time to migrate 1G instance.  I have 10Gbps network and i have
tried to copy 10G file between two compute node and it did copy in 2
minute, so i am not seeing any network issue also.

it seem live_migration has some bandwidth limit, I have tried
following option in nova.conf but it didn't work

live_migration_bandwidth = 500

My nova.conf look like following:

live_migration_uri =
live_migration_tunnelled = True
live_migration_bandwidth = 500
hw_disk_discard = unmap
disk_cachemodes = network=writeback