Am Wednesday 23 February 2011 schrieb Rafael J. Wysocki: > On Wednesday, February 23, 2011, Martin Steigerwald wrote: > > Am Tuesday 22 February 2011 schrieb Rafael J. Wysocki: > > > On Tuesday, February 22, 2011, Martin Steigerwald wrote: > > > > Am Tuesday 22 February 2011 schrieb Rafael J. Wysocki: > > > > > On Tuesday, February 22, 2011, Martin Steigerwald wrote: > > > > > > Hi! > > > > > > > > > > > > Since Radeon KMS I often have it that my ThinkPad T42 with 2 > > > > > > MiB of RAM is not able to allocate memory for the > > > > > > hibernation image. Before KMS hibernation only very rarely > > > > > > failed for that reason. > > > > > > > > > > > > Often I run without compositing at all as I believe this > > > > > > might spare some pages as well. But this doesn't always > > > > > > help. > > > > > > > > > > > > It complains that to less pages could be freed. For example > > > > > > with kernel 2.6.37: > > > > > > > > > > > > Feb 16 00:15:00 shambhala kernel: PM: Creating hibernation > > > > > > image: Feb 16 00:15:00 shambhala kernel: PM: Need to copy > > > > > > 186577 pages Feb 16 00:15:00 shambhala kernel: PM: Normal > > > > > > pages needed: 114411 + 1024, available pages: 112767 > > > > > > Feb 16 00:15:00 shambhala kernel: PM: Not enough free memory > > > > > > Feb 16 00:15:00 shambhala kernel: PM: Error -12 creating > > > > > > hibernation image Feb 16 00:15:00 shambhala kernel: Extended > > > > > > CMOS year: 2000 Feb 16 00:15:00 shambhala kernel: ACPI: > > > > > > Waking up from system sleep state S4 > > > > > > Feb 16 00:15:00 shambhala kernel: PM: early recover of > > > > > > devices complete after 0.376 msecs > > > > > > > > > > What's the value in /sys/power/image_size? > > > > > > > > shambhala:~> cat /sys/power/image_size > > > > 844206080 > > > > > > > > Should I try with less? > > > > > > Yes, please. Try with 700000000 for example. > > > > I replaced dropping by settings image_size to this valua and the > > ThinkPad hibernated with KMail open. Thus seems to work, but I will > > test a bit further. > > > > Where does the higher value previously set come from? Autotuning? > > Likely. The number seems to match at least. > > > Is there anything that can be improved with autotuning? > > We can lower the ratio of the image size to the total RAM. > Alternatively, we can increase SPARE_PAGES. > > > If yes, I can file a bug report. > > Yes, please. Reported-as: Bug 30482 - try harder to free enough memory / improve image size autotuning > > Otherwise I just try to find a good value for image size and be > > done with it. > > It would be helpful if you could determine the greatest image size > working for you. I am at 710000000 at the moment. See bug report. I got the occassional hang on hibernation that I reported somewhere else. You hinted at that the kernel has problems to free enough memory and takes long to do that. I waited for minutes. Will report this as a different bug and link it from there. Thanks, -- Martin 'Helios' Steigerwald - http://www.Lichtvoll.de GPG: 03B0 0D6C 0040 0710 4AFA B82F 991B EAAC A599 84C7
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