netdev - Re: [PATCH] inet: delay address promotion check until last request in message

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Message-Id: <20151109.073138.1861688515066155518.davem@davemloft.net>
Date:	Mon, 09 Nov 2015 07:31:38 +0900 (KST)
From:	David Miller <davem@...emloft.net>
To:	nhorman@...driver.com
Cc:	ja@....bg, netdev@...r.kernel.org, kuznet@....inr.ac.ru,
	jmorris@...ei.org, yoshfuji@...ux-ipv6.org, kaber@...sh.net
Subject: Re: [PATCH] inet: delay address promotion check until last request
 in message

From: Neil Horman <nhorman@...driver.com>
Date: Sun, 8 Nov 2015 16:56:41 -0500

> All I'm doing is, in effect masking the promote_secondaries sysctl
> for an interface doing a flush operation.

Packets and other entities not controlled by RTNL can see an inconsistent
state: no primary address on the interface.

You can argue that this happened already but usually the window is tiny.

For the case you are optimizing for, the window is now several seconds
long.  That's not really something we can do.
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