netdev - Re: Q: netdev: generate kobject uevent on network events.

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Message-ID: <ac3eb2510912091046g4e5173b1sb97d6a4dddfd0b81@mail.gmail.com>
Date:	Wed, 9 Dec 2009 19:46:26 +0100
From:	Kay Sievers <kay.sievers@...y.org>
To:	Johannes Stezenbach <js@...21.net>
Cc:	Stephen Hemminger <shemminger@...tta.com>, netdev@...r.kernel.org,
	linux-hotplug@...r.kernel.org
Subject: Re: Q: netdev: generate kobject uevent on network events.

On Wed, Dec 9, 2009 at 18:02, Johannes Stezenbach <js@...21.net> wrote:
> about a year ago you posted a patch which allows to manage
> network hotplug via udev (or busybox mdev), which is useful
> for low-end embedded platforms that don't want to run ifplugd.
>
> http://article.gmane.org/gmane.linux.hotplug.devel/13386
>
> The patch still works with 2.6.32.  Can it get merged or
> were there any issues with it?  It seems the discussion
> just stopped and the patch was forgotten...

Can't, in some setups, these events happen at a rather high frequency?
I heard of people running many hundreds of ppp interfaces on a single
box acting as a DSL concentrator. They state to already have trouble
handling the amount of uevents generated on such boxes just for the
"add/remove" events of all the interfaces if something goes wrong with
the network. If we add more for state transitions, such events would
probably need to be rate-limited. In general, uevents/udev are not
really suitable for high-frequency events, and if such behavior can be
expected, we might better stick with the current netlink interface.

Thanks,
Kay
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