Hi,
we are running a BGP border router using a CCR1036 with RouterOS 7.1 since beta1.
Since beta6, we are having severe performance issues with forwarding ip6gre packets. As beta3-5 have been unusable due to several significant BGP/filtering issues, therefore we don't know if these versions are affected.
While we are able to get >800 mbit/s TCP through a gre6 tunnel with RouterOS 7.1beta2, only about 15 mbit/s can be achieved with RouterOS 7.1rc1.
It does not seem to affect UDP traffic inside the GRE tunnel.
The GRE tunnel is not(!) established on a RouterOS devices. RouterOS only forwards the ip6gre packets between the tunnel endpoints.
When speed testing directly from endpoint to endpoint (IPv6) without encapsulating traffic inside a ip6gre tunnel, the speed is as expected (~800-900 mbit/s).
The router is processing ~6-7 gbit/s constantly. Without this background noise, the issue is a bit harder to observe.