Public bug reported:
When we use the 3.16 kernel (Ubuntu 14.04.2) and have all our NIC pairs
bonded using "bond-xmit-hash-policy layer3+4", I can run iperf with
multiple threads and get 2Gbps throughput out of 2 x 1Gb NICs.
We then upgrade and run kernel 4.4.0 (Ubuntu 14.04.5) and notice on the
SENDING side of iperf, I can only get one NIC to move traffic. It does
seem to be isolated to the machine originating traffic being kernel rev
4.4.0, as I can run a 3.16 iperf SENDER pointed at a 4.4.0 iperf
RECEIVER and get my 2Gbps. So - the problem is only evident on the
iperf SENDING machine when it runs the 4.4.0 kernel.
The status of this particular Bugzilla report at
https://bugzilla.kernel.org/show_bug.cgi?id=53321 bug is "Reopened".
Somewhere between 3.16 and 4.4 - did bonding lose the ability to use
multiple slaves when sending multiple transmissions?
** Affects: linux-lts-xenial (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1617455
Title:
802.3ad use one NIC on the way out
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