https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=197344
Bug ID: 197344
Summary: tx checksum broken on XEN
Product: Base System
Version: 10.1-RELEASE
Hardware: amd64
OS: Any
Status: New
Severity: Affects Some People
Priority: ---
Component: kern
Assignee: freebsd-bugs@FreeBSD.org
Reporter: pgad...@pse-consulting.de
This issue might be related to
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=192013 and
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=154428 , but I found it to be
NOT pf specific.
I've been testing pfSense 2.2 on Xen 4.1, and got the same issue as
https://forum.pfsense.org/index.php?topic=85797.15 : routing traffic through
the FreeBSD 10.1 machine that uses xn* interface hardly works and gives abysmal
performance. Packets leaving the router contain an invalid checksum, and don't
reach the target VM's tcp stack.
A workaround (with at least 50% performance penalty) is to disable tx
offloading on all router interfaces in dom0, i.e. calling
ethtool -K vif{N}.{x} tx off
The issue can be observed whether the pf firewall is active or not, so it
appears to be a FreeBSD xen-netfront driver problem.
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