linux-kernel - Re: [PATCH] Hyperv: Trigger DHCP renew after host hibernation

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Message-ID: <20140721131154.GA23385@tango.0pointer.de>
Date:	Mon, 21 Jul 2014 15:11:54 +0200
From:	Lennart Poettering <mzxreary@...inter.de>
To:	"Yue Zhang (OSTC DEV)" <yuezha@...rosoft.com>
Cc:	Tom Gundersen <teg@...m.no>, netdev <netdev@...r.kernel.org>,
	"driverdev-devel@...uxdriverproject.org" 
	<driverdev-devel@...uxdriverproject.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Greg KH <gregkh@...uxfoundation.org>,
	"olaf@...fle.de" <olaf@...fle.de>,
	"jasowang@...hat.com" <jasowang@...hat.com>,
	David Miller <davem@...emloft.net>,
	Haiyang Zhang <haiyangz@...rosoft.com>,
	KY Srinivasan <kys@...rosoft.com>,
	Thomas Shao <huishao@...rosoft.com>,
	Dexuan Cui <decui@...rosoft.com>
Subject: Re: [PATCH] Hyperv: Trigger DHCP renew after host hibernation

On Mon, 21.07.14 10:21, Yue Zhang (OSTC DEV) (yuezha@...rosoft.com) wrote:

> Some network monitoring daemon, like ifplugd has a deferring mechanism.
> When it detects carriers is offline, it doesn't trigger DHCP renew immediately. 
> Instead it will wait for another 5 seconds to check whether carrier is back to 
> online status. In that case, it will avoid renew DHCP lease.

ifplugd doesn't renew DHCP leases anyway, one of the scripts it invokes
does.

ifplugd is obsolete software. I wrote it more than 10 years ago, and
haven't really updated it since. it's sounds seriously wrong to add
multi-second waits to the kernel just to make this crappy, obsolete
software work.

Please fix this properly, and work with the PM guys, so that we get a
sane userspace how the kernel can notify userspace about
suspends/hibernations triggered from the outside, so that userspace
daemons can subscribe to that and then refresh the DHCP leases on their
own.

Lennart

-- 
Lennart Poettering, Red Hat
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