Hello everybody,

i have noticed some odd behaviour with networking under Xen with FreeBSD 10 as 
a DomU.

- IPv6 (TCP) bandwith drops from ~10 Gbit/s IPv4 to around 3 Gbit/s IPv6. 
(measured with iperf)

- Dropped/Stalled Connections with TCP Segmentation Offload and pf enabled.

- IPSEC-enabled Kernel TCP Performance drops from ~10 Gbit/s to ~200 Mbit/s 
(iperf).

I have observed this behaviour under Freebsd 10, 10.1 and 10 Stable.

The Hypervisor is running Xen 4.4 with a Linux 3.16 Dom0.

Any Suggestions?
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