netdev - Re: [PATCH] net: don't unnecessarily load kernel modules in dev

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Message-Id: <20180308.131115.611191617522587758.davem@davemloft.net>
Date:   Thu, 08 Mar 2018 13:11:15 -0500 (EST)
From:   David Miller <davem@...emloft.net>
To:     eric.dumazet@...il.com
Cc:     stephen@...workplumber.org, pmoore@...hat.com,
        netdev@...r.kernel.org, viro@...iv.linux.org.uk,
        dac.override@...il.com, selinux@...ho.nsa.gov,
        linux-security-module@...r.kernel.org
Subject: Re: [PATCH] net: don't unnecessarily load kernel modules in
 dev_ioctl()

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Thu, 8 Mar 2018 10:05:12 -0800

> Another problematic legacy behavior is the automatic creation of
> fallback tunnels, which hurts netns creation/deletion.
> 
> Some environments want to create a netns for every job/task, and they
> do not care if the init netns has these tunnels or not.
> 
> We have a local patch adding yet another knob to control this, since
> it saves a lot of cpu cycles (about 10ms per netns create/delete pair
> here)

Yeah, understood.  At small scale the current behavior maybe made
sense, but these days it really doesn't.

No objections to the knob if you want to submit it.