** Changed in: linux (Ubuntu Quantal)
Status: In Progress => Fix Committed
** Changed in: linux (Ubuntu Raring)
Status: In Progress => Fix Committed
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https://bugs.launchpad.net/bugs/1201869
Title:
poor networking throughput across an OpenStack Neutron router on
3.5/3.8 kernels
Status in “linux” package in Ubuntu:
Fix Released
Status in “linux” source package in Quantal:
Fix Committed
Status in “linux” source package in Raring:
Fix Committed
Bug description:
SRU Justification:
Impact:
Users of the 3.5/3.8 kernel will have poor network throughput when using
OpenStack Neutron depending on their setup.
Fix:
These upstream patches are necessary to fix the issue:
2681128f0ced8aa4e66f221197e183cc16d244fe
8093315a91340bca52549044975d8c7f673b28a1
d0e2c55e7c940a3ee91e9e23a2683b593690f1e9
2efd32ee1b60b0b31404ca47c1ce70e5a5d24ebc
f45a5c267da35174e22cec955093a7513dc1623d
Testcase:
Setup OpenStack Neutron. Test throughput between internal and external nodes.
The following explains an example vlan+namespace configuration:
Internal Node: [10.x.x.2]->eth2.123->br123->tap123->qr-123[10.x.x.1] <---
netns: qrouter-123
netns: qrouter-123 ---> qg-234[10.x.y.1]->tap234->br234->eth2.234->External
Node[10.x.y.2]
Where:
1) tap123+qr-123 and tap234+qg-234 are veth pairs
2) qr-123 and qg-234 reside inside the qrouter-123 namespace
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OpenStack Neutron does IP forwarding through a network namespace. A
veth pair is used to connect into the namespace. The veth pair appears
to be the bottleneck, independent of network namespace. In newer
versions of Linux (Ubuntu-3.9.0-7.15 / v3.9-rc1 and greater)
throughput is much higher by almost 3 times. For example with some
testing throughput is 3.5 Gbps in pre 3.9-rc1 versions and 9.1 Gbps
with these patches applied.
This has been confirmed on kernels from 3.5.x-3.8.x. (Quantal and
Raring lts backports)
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