netdev - Takes > 1 second to delete macvlan with global IPv6 address on it.

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Message-ID: <4CD893C6.2030803@candelatech.com>
Date:	Mon, 08 Nov 2010 16:20:22 -0800
From:	Ben Greear <greearb@...delatech.com>
To:	NetDev <netdev@...r.kernel.org>
Subject: Takes > 1 second to delete macvlan with global IPv6 address on it.

This is on an otherwise lightly loaded 2.6.36 + hacks system, 12 physical interfaces,
and two VETH interfaces.

It's much faster to delete an interface when it has no IPv6 address:

[root@...03-60 lanforge]# time ip link add link eth5 up name eth5#0 address 00:00:00:00:00:01 type macvlan

real	0m0.005s
user	0m0.001s
sys	0m0.004s
[root@...03-60 lanforge]# time ip link delete eth5#0

real	0m0.033s
user	0m0.001s
sys	0m0.005s
[root@...03-60 lanforge]# ip link add link eth5 up name eth5#0 address 00:00:00:00:00:01 type macvlan

[root@...03-60 lanforge]# ip -6 addr add 2002::1/64 dev eth5#0
[root@...03-60 lanforge]# time ip link delete eth5#0

real	0m1.030s
user	0m0.000s
sys	0m0.013s


Funny enough, if you explicitly remove the IPv6 addr first it seems
to run at normal speed (adding both operation's times together)

[root@...03-60 lanforge]# ip link add link eth5 up name eth5#0 address 00:00:00:00:00:01 type macvlan
[root@...03-60 lanforge]# ip -6 addr add 2002::1/64 dev eth5#0
[root@...03-60 lanforge]# time ip -6 addr delete 2002::1/64 dev eth5#0

real	0m0.001s
user	0m0.000s
sys	0m0.001s
[root@...03-60 lanforge]# time ip link delete eth5#0

real	0m0.028s
user	0m0.001s
sys	0m0.005s


Take it easy,
Ben


-- 
Ben Greear <greearb@...delatech.com>
Candela Technologies Inc  http://www.candelatech.com

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