From: David Miller <davem-fT/PcQaiUtIeIZ0/mPfg9Q@public.gmane.org>
To: eric.dumazet-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org
Cc: netdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
stephen-OTpzqLSitTUnbdJkjeBofR2eb7JE58TQ@public.gmane.org,
linux-security-module-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
viro-RmSDqhL/yNMiFSDQTTA3OLVCufUGDwFn@public.gmane.org,
selinux-+05T5uksL2qpZYMLLGbcSA@public.gmane.org
Subject: Re: [PATCH] net: don't unnecessarily load kernel modules in dev_ioctl()
Date: Thu, 08 Mar 2018 13:11:15 -0500 (EST) [thread overview]
Message-ID: <20180308.131115.611191617522587758.davem@davemloft.net> (raw)
In-Reply-To: <c2d378b6-80b3-d9e1-7087-95f143875067-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
From: Eric Dumazet <eric.dumazet-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
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.
WARNING: multiple messages have this Message-ID (diff)
From: David Miller <davem@davemloft.net>
To: eric.dumazet@gmail.com
Cc: stephen@networkplumber.org, pmoore@redhat.com,
netdev@vger.kernel.org, viro@zeniv.linux.org.uk,
dac.override@gmail.com, selinux@tycho.nsa.gov,
linux-security-module@vger.kernel.org
Subject: Re: [PATCH] net: don't unnecessarily load kernel modules in dev_ioctl()
Date: Thu, 08 Mar 2018 13:11:15 -0500 (EST) [thread overview]
Message-ID: <20180308.131115.611191617522587758.davem@davemloft.net> (raw)
In-Reply-To: <c2d378b6-80b3-d9e1-7087-95f143875067@gmail.com>
From: Eric Dumazet <eric.dumazet@gmail.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.
WARNING: multiple messages have this Message-ID (diff)
From: davem@davemloft.net (David Miller)
To: linux-security-module@vger.kernel.org
Subject: [PATCH] net: don't unnecessarily load kernel modules in dev_ioctl()
Date: Thu, 08 Mar 2018 13:11:15 -0500 (EST) [thread overview]
Message-ID: <20180308.131115.611191617522587758.davem@davemloft.net> (raw)
In-Reply-To: <c2d378b6-80b3-d9e1-7087-95f143875067@gmail.com>
From: Eric Dumazet <eric.dumazet@gmail.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.
--
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next prev parent reply other threads:[~2018-03-08 18:11 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-03-06 22:27 [PATCH] net: don't unnecessarily load kernel modules in dev_ioctl() Paul Moore
2018-03-06 22:27 ` Paul Moore
2018-03-06 22:27 ` Paul Moore
2018-03-06 22:32 ` Paul Moore
2018-03-06 22:32 ` Paul Moore
2018-03-06 22:32 ` Paul Moore
[not found] ` <CAHC9VhR4FzwsAEO9O9Pnpkm2jOBajwZUkn_i0FqOMR_4ycag2g-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-03-07 20:13 ` David Miller
2018-03-07 20:13 ` David Miller
2018-03-07 20:13 ` David Miller
2018-03-06 23:59 ` Stephen Hemminger
2018-03-06 23:59 ` Stephen Hemminger
2018-03-06 23:59 ` Stephen Hemminger
2018-03-07 13:46 ` Paul Moore
2018-03-07 13:46 ` Paul Moore
2018-03-07 13:46 ` Paul Moore
2018-03-08 17:34 ` David Miller
2018-03-08 17:34 ` David Miller
2018-03-08 17:34 ` David Miller
[not found] ` <20180308.123440.2224695014753871221.davem-fT/PcQaiUtIeIZ0/mPfg9Q@public.gmane.org>
2018-03-08 18:05 ` Eric Dumazet
2018-03-08 18:05 ` Eric Dumazet
2018-03-08 18:05 ` Eric Dumazet
[not found] ` <c2d378b6-80b3-d9e1-7087-95f143875067-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2018-03-08 18:11 ` David Miller [this message]
2018-03-08 18:11 ` David Miller
2018-03-08 18:11 ` David Miller
[not found] ` <20180308.131115.611191617522587758.davem-fT/PcQaiUtIeIZ0/mPfg9Q@public.gmane.org>
2018-03-08 20:53 ` Eric Dumazet
2018-03-08 20:53 ` Eric Dumazet
2018-03-08 20:53 ` Eric Dumazet
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