Several sources suggest that turning odd tso, and perhaps also sg and
tx, might help. Could you try
sudo ethtool -K eth4 tso off
sudo ethtool -K eth4 sg off
sudo ethtool -K eth4 tx off
and try again?
Also, could you show the result of 'brctl show' and 'ip link'?
** Changed in: bridge-utils (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/894608
Title:
Implementing a bridge slows 10G network
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