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Date: Sat, 12 Sep 2009 10:54:56 -0600 From: Robert Hancock <hancockrwd@...il.com> To: Anil kumar <anils_r@...oo.com> CC: linux-kernel@...r.kernel.org Subject: Re: hibernate takes long time with huge file transfers On 09/11/2009 12:04 PM, Anil kumar wrote: > Hi, > > I am running a huge file transfer by using simple dd command. I see that the process state of this dd is "D" uninterruptible sleep. Now I hibernate the system. > > what I observe is that hibernate takes long time to complete. Looks like its waiting for the "dd" command to complete. > My understanding is that since the process is in uninterruptible sleep, hibernate is not able to stop the task. > > Question: > 1. Does hibernation work this way wherein it waits for the process to complete and then hibernate. Especially if the process is in uninterruptible sleep state. > 2. What if the process is not in uninterruptible sleep? I don't imagine the fact it's in D state would have anything to do with it, more likely that it's constantly generating writes and the hibernation process does a sync, which may take a long time if something is dirtying memory as fast it can be written out.. > 3. Does sync'ing also adds to longer durations? > > Thanks in advance for the help. > > With regards, > Anil > > > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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