Source: openvswitch-switch
Version: 1.9.3+git20131029-1.1
Severity: important
Dear Maintainer,
* What led up to the situation?
I ran apt-get upgrade/aptitude safe-upgrade on the host to upgrade my testing
box to latest testing packages.
* What exactly did you do (or not do) that was effective (or
ineffective)?
After installing the latest 3.12 kernel (linux-image-3.12-1-amd64, version
3.12.9-1) from testing causes TCP connections to stop working on qemu/kvm
connected to openvswitch by way of a virtio-net tap
device. Packet traces show lots of TCP retransmission errors. Very
occasionally a TCP connection works, but is dropped soon after. Most often the
connection stops working entirely.
If I run the command:
ethtool -K <virtio-net tap device> tso off gro off gso off tx off rx off
everything starts working again.
Going back to 3.11 kernel also makes things work.
* What was the outcome of this action?
Using 3.12 kernel from testing causes TCP connections to stop working on
qemu/kvm guests and generates large numbers of TCP retransmission errors
* What outcome did you expect instead?
Using 3.12 kernel from testing should not break TCP connections on qemu/kvm
guests
-- System Information:
Debian Release: jessie/sid
APT prefers testing
APT policy: (990, 'testing'), (500, 'unstable'), (500, 'stable')
Architecture: amd64 (x86_64)
Kernel: Linux 3.12-1-amd64 (SMP w/1 CPU core)
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
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