Re: network-online.target time

[Reindl Harald <h.reindl@xxxxxxxxxxxxx>]

Am 22.04.20 um 16:44 schrieb Peter Morrow:
> I'm trying to optimise our boot process and have started to look at
> the time it takes for the network to come up (a single interface to be
> routable) when using systemd-networkd:
> 
> So, here systemd-networkd-wait-online.service seems to run for 3.5s -
> I had initially though this is due to the RTT for DHCP but in doing a
> packet capture for DHCP this isn't the case:
> 
> Can anyone offer any suggestions for where I should look to try to
> speed things up here?

it *is* dhcp - it's that simple

10.587s network-up.service
9.116s  network-wan-dhcp.service

"network-wan-dhcp.service" in our case is simply started by
"network-up.service" which is a simple selfmade unit using ip-commands
and nothing else

there is no way to make that simpler as in my setup

[root@srv-rhsoft:~]$ systemctl status network-wan-dhcp.service
● network-wan-dhcp.service - Internet DHCP-Client
   Loaded: loaded (/etc/systemd/system/network-wan-dhcp.service; static;
vendor preset: disabled)
   Active: active (running) since Tue 2020-04-21 19:24:58 CEST; 21h ago
 Main PID: 1296 (dhclient)
    Tasks: 1 (limit: 512)
   Memory: 4.6M
      CPU: 86ms
   CGroup: /system.slice/network-wan-dhcp.service
           └─1296 /usr/sbin/dhclient -4 -q --no-pid --request-options
subnet-mask,routers br-wan
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