netdev - Very slow remove interface from kernel

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Date: Tue, 9 May 2023 11:22:13 +0300
From: Martin Zaharinov <micron10@...il.com>
To: Eric Dumazet <edumazet@...gle.com>,
 netdev <netdev@...r.kernel.org>
Subject: Very slow remove interface from kernel

Hi Eric 

I think may be help for this :


I try this on kernel 6.3.1 

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 ?


Same problem is when have 5-6k ppp interface kernel very slow unregister device.


best regards,	
m.