Please vote Yes if you agree with all of the following.
If you disagree, please vote No.
If you don't have an opinion, please vote Abstain.
I move that:
The TC agrees to resolve the following specification issue:
Issue #173: virtio-net: support inner header hash
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1. Currently, a received encapsulated packet has an outer and an inner header, but
the virtio device is unable to calculate the hash for the inner header. The same
flow can traverse through different tunnels, resulting in the encapsulated
packets being spread across multiple receive queues (refer to the figure below).
However, in certain scenarios, we may need to direct these encapsulated packets of
the same flow to a single receive queue. This facilitates the processing
of the flow by the same CPU to improve performance (warm caches, less locking, etc.).
client1 client2
| +-------+ |
+------->|tunnels|<--------+
+-------+
| |
v v
+-----------------+
| monitoring host |
+-----------------+
To achieve this, the device can calculate a symmetric hash based on the inner headers
of the same flow.
2. For legacy systems, they may lack entropy fields which modern protocols have in
the outer header, resulting in multiple flows with the same outer header but
different inner headers being directed to the same receive queue. This results in
poor receive performance.
To address this limitation, inner header hash can be used to enable the device to advertise
the capability to calculate the hash for the inner packet, regaining better receive performance.
Latest v21 patch: https://lists.oasis-open.org/archives/virtio-dev/202307/msg00006.html
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The TC accepts the following proposed changes to the specification:
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https://lists.oasis-open.org/archives/virtio-dev/202307/msg00006.html
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The TC agrees to include the above change(s) in specification version(s) "virtio-v1.3-cs01", and future versions of the
specification.
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Reminder: A Voting Member must be active in a TC to maintain voting rights. As
the Virtio TC has adopted a standing rule to conduct business only by
electronic ballot, without Meetings, a Voting Member who fails to cast a ballot
in two consecutive Work Product Ballots loses his or her voting rights at the
close of the second ballot missed.
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