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