i recognized that a "simple" 'ifup lan' can be
very expensive for a router with low ressources,
below a typcal call/execution trace:
hotplug-call: $1 = 'iface' START: 1139
hotplug-call: $1 = 'net' START: 1141
hotplug-call: script: /etc/hotplug.d/iface/00-netstate START: 1139
hotplug-call: script: /etc/hotplug.d/net/00-sysctl START: 1141
hotplug-call: script: /etc/hotplug.d/iface/00-netstate READY: 1139
hotplug-call: script: /etc/hotplug.d/net/00-sysctl READY: 1141
hotplug-call: script: /etc/hotplug.d/iface/15-teql START: 1139
hotplug-call: script: /etc/hotplug.d/net/99-batman-adv START: 1141
hotplug-call: script: /etc/hotplug.d/iface/30-6relay START: 1139
hotplug-call: script: /etc/hotplug.d/net/99-batman-adv READY: 1141
hotplug-call: $1 = 'net' READY: 1141
hotplug-call: $1 = 'net' START: 1168
hotplug-call: script: /etc/hotplug.d/net/00-sysctl START: 1168
hotplug-call: script: /etc/hotplug.d/net/00-sysctl READY: 1168
hotplug-call: script: /etc/hotplug.d/net/99-batman-adv START: 1168
hotplug-call: script: /etc/hotplug.d/net/99-batman-adv READY: 1168
hotplug-call: $1 = 'net' READY: 1168
hotplug-call: script: /etc/hotplug.d/iface/30-6relay READY: 1139
hotplug-call: script: /etc/hotplug.d/iface/50-olsrd START: 1139
hotplug-call: script: /etc/hotplug.d/iface/50-olsrd READY: 1139
hotplug-call: $1 = 'iface' READY: 1139
hotplug-call: $1 = 'iface' START: 1194
hotplug-call: script: /etc/hotplug.d/iface/00-netstate START: 1194
hotplug-call: script: /etc/hotplug.d/iface/00-netstate READY: 1194
hotplug-call: script: /etc/hotplug.d/iface/15-teql START: 1194
hotplug-call: script: /etc/hotplug.d/iface/15-teql READY: 1194
hotplug-call: script: /etc/hotplug.d/iface/30-6relay START: 1194
hotplug-call: script: /etc/hotplug.d/iface/30-6relay READY: 1194
hotplug-call: script: /etc/hotplug.d/iface/50-olsrd START: 1194
hotplug-call: script: /etc/hotplug.d/iface/50-olsrd READY: 1194
hotplug-call: $1 = 'iface' READY: 1194
we can see, that there a some calls to the shell-script '/sbin/hotplug-call'
with argument 'iface' or 'net' and the script itself sources again all
scripts found in the 'iface' or 'net'-folder. the calls for 'iface'
and 'net' run in parallel. (last number is process-id).
is it really needed to run in parallel? maybe it can be made configurable
to run one after another?
i would like to send some optimizations, e.g. for the script
'/etc/hotplug.d/iface/00-netstate' we can change the external call
sed -ne 's![^0-9].*$!!p' /proc/uptime
to
cut -d'.' -f1 /proc/uptime
or even to use only internal calls:
read UP REST </proc/up - and then use ${UP%.*}
are the 'micro-optimizations' and nobody cares or is this ok?
fun fact: at the moment it can last several minutes on lowmem-routers
to do these easy tasks, because of the heavy forking/memory usage involved.
bye, bastian
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