netdev - Re: Very slow remove interface from kernel

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Message-ID: <ZFoeZLOZbNZPUfcg@shredder>
Date: Tue, 9 May 2023 13:20:20 +0300
From: Ido Schimmel <idosch@...sch.org>
To: Martin Zaharinov <micron10@...il.com>
Cc: Eric Dumazet <edumazet@...gle.com>, netdev <netdev@...r.kernel.org>
Subject: Re: Very slow remove interface from kernel

On Tue, May 09, 2023 at 11:22:13AM +0300, Martin Zaharinov wrote:
> add vlans : 
> for i in $(seq 2 4094); do ip link add link eth1 name vlan$i type vlan id $i; done
> for i in $(seq 2 4094); do ip link set dev vlan$i up; done
> 
> 
> and after that run : 
> 
> for i in $(seq 2 4094); do ip link del link eth1 name vlan$i type vlan id $i; done
> 
> 
> time for remove for this 4093 vlans is 5-10 min .
> 
> Is there options to make fast this ?

If you know you are going to delete all of them together, then you can
add them to the same group during creation:

for i in $(seq 2 4094); do ip link add link eth1 name vlan$i up group 10 type vlan id $i; done

Then delete the group:

ip link del group 10

IIRC, in the past there was a patchset to allow passing a list of
ifindexes instead of a group number, but it never made its way upstream.