Re: Long delays while hibernating

[Tejun Heo <tj@kernel.org>]

On 12/23/2009 12:50 PM, Pedro Ribeiro wrote:
> Hi,
> 
> I have a 2.6.32.2 kernel with the TuxOnIce and KDB patches. When I
> hibernate, the penultimate phase is the "Atomic copy/restore". On
> normal conditions, this takes 1 second or less.
> 
> I have a Thinkpad T400 with an ultrabay, which is a hot-swappable
> drive enclosure, which can take in an optical drive (my case), hard
> disk or extra battery.
> To save some battery, I use the script here
> http://www.thinkwiki.org/wiki/How_to_hotswap_UltraBay_devices#Script_for_Ultrabay_eject
> to power off the ultrabay.
> 
> Then when I hibernate with the ultrabay powered off, the "Atomic
> copy/restore" phase takes 30 seconds and sometimes even a hard lockup
> occurs.
> Just at the start of "Atomic copy/restore", the drive gets polled (the
> light flashes for a second and makes some loading noise) and then
> takes the CPU to 100% (I can hear the fan roar) for 30 seconds.
> 
> I'm sure this is related to the fact that the ultrabay is powered off.
> There nothing else that triggers this.
> 
> I tried using KDB to interrupt during this phase but that doesn't
> work. Only after the operation is complete KDB jumps in, so there is
> no way to interrupt whatever is happening.
> 
> I reported this issue to the TuxOnIce developer, and he asked me to
> report it to you.

Can you please attach the output of dmidecode?

Thanks.

-- 
tejun