Public bug reported:
This bug is present in 16.04 as well as 18.04, including the upstream
version of ifenslave as far as I can tell. But as a formality let's
assume ifenslave-2.9ubuntu1
/etc/network/if-pre-up.d/ifenslave assumes xmit_hash_policy can be set
in any order, as below:
# xmit_hash_policy can be set anytime.
# Changing xmit_hash_policy requires $BOND_MASTER to be down.
sysfs_change_down xmit_hash_policy "$IF_BOND_XMIT_HASH_POLICY"
However, this comment is not true. For example when trying to create the
following in /etc/network/interfaces:
iface bond0 inet manual
bond-slaves none
bond-mode balance-tlb
bond-miimon 100
bond-xmit_hash_policy 1
Results in this error in dmesg on boot, since the mode balance-tlb is
set after xmit_hash_policy:
[ 15.210041] xmit_hash_policy param is irrelevant in mode load
balancing (round-robin)
The script should set xmit_hash_policy after setting mode.
An ugly workaround at the moment is to do:
iface bond0 inet manual
bond-slaves none
bond-miimon 100
pre-up /bin/echo 5 > /sys/class/net/bond0/bonding/mode; /bin/echo
1 > /sys/class/net/bond0/bonding/xmit_hash_policy
** Affects: ifenslave (Ubuntu)
Importance: Undecided
Status: New
** Tags: bonding ifenslave
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https://bugs.launchpad.net/bugs/1768345
Title:
ifenslave fails to set xmit_hash_policy
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