netdev - Re: [RFC][PATCH] iproute: Faster ip link add, set and delete

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Date:	Tue, 26 Mar 2013 08:31:00 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Benoit Lourdelet <blourdel@...iper.net>
Cc:	Stephen Hemminger <stephen@...workplumber.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Serge Hallyn <serge.hallyn@...ntu.com>
Subject: Re: [RFC][PATCH] iproute: Faster ip link add, set and delete

On Tue, 2013-03-26 at 11:51 +0000, Benoit Lourdelet wrote:

> The script to delete:
> for d in /sys/class/net/veth*; do
> 	ip link del `basename $d` 2>/dev/null || true
> Done
> 
> There is a very good improvement in deletion.

I can do better ;)

If you are really doing this kind of things, you could use :

rmmod veth

Note that "ip" command supports a batch mode

ip -batch filename

In this case, the caching is done only once.

Eric, Stephen, one possibility would be to use the cache only in batch
mode.

Anyway caching is wrong because several users can use ip command at the
same time.



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