From mboxrd@z Thu Jan 1 00:00:00 1970 From: Lennart Poettering Subject: Re: [PATCH] Hyperv: Trigger DHCP renew after host hibernation Date: Mon, 21 Jul 2014 15:11:54 +0200 Message-ID: <20140721131154.GA23385@tango.0pointer.de> References: <1405680903-28176-1-git-send-email-yuezha@microsoft.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Cc: "olaf@aepfle.de" , netdev , "jasowang@redhat.com" , "driverdev-devel@linuxdriverproject.org" , Haiyang Zhang , LKML , Tom Gundersen , Thomas Shao , Greg KH , David Miller To: "Yue Zhang (OSTC DEV)" Return-path: Content-Disposition: inline In-Reply-To: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: driverdev-devel-bounces@linuxdriverproject.org Sender: driverdev-devel-bounces@linuxdriverproject.org List-Id: netdev.vger.kernel.org On Mon, 21.07.14 10:21, Yue Zhang (OSTC DEV) (yuezha@microsoft.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 ifplugd is obsolete software.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