There is a limiting function in hypervm for uplink, however the ability to limit downlink speed is not included.
For those who want to offer a truly unmetered VPS (with no bandwidth limit but a capped speed), this feature is inadequate as a customer could use more bandwidth than they are capped at by downloading more.
When HyperVM limits the uplink speed, it is inserting code into this file:
/usr/local/lxlabs/hypervm/etc/openvz_tc.sh
If you have used traffic ...