On Monday, August 02, 2010, Stephan Diestelhorst wrote: > On Wednesday 28 July 2010, 23:50:09 Rafael J. Wysocki wrote: > > On Saturday, July 10, 2010, Tejun Heo wrote: > > > On 07/10/2010 08:50 AM, Stephan Diestelhorst wrote: > > > >> I have a box where this problem is kind of reproducible, but it happens _very_ > > > >> rarely. Also I can't reproduce it on demand running suspend-resume in a tight > > > >> loop. Are you able to reproduce it more regurarly? > > > > > > > > For me it is much more reproducible. If I run multiple direct writing > > > > dd-s to the disk in question I trigger it rather reliably (~75% or > > > > higher). See the attached script from an earlier email. > > > > Maybe that helps triggering your case more reliabl, too? > > > > > That didn't help, but the appended patch fixes the problem for me. > > <snip> > > Sorry for taking ages. Vacation and catching up after it are to blame, > as is me forgetting to build a proper initrd... > > Thanks for the patch! It certainly changes behaviour, however, in a > very strange way for me. With your patch my machine does not suspend > to ram anymore (a simple echo mem > /proc/sys/state blocks), and > nothing happens in dmesg if there is a lot of write I/O while > suspending. (A number of parallel dd's with oflag=direct) > > If I stop the I/O, the system eventually goes into suspend to RAM. > However, that takes a while, after the I/O has stopped, and also > from "Preparing system for suspend" log entry until it is actually > done. > > Is this intentional? It surely isn't. > Let me know how I can debug this further! > Ideally I'd like to be able to suspend the machine under I/O load, > too. (E.g. during a compile job.) > > Can you reproduce this at your end, too? Well, I didn't try suspending with a number of parallel dd's with oflag=direct in the background, but otherwise I'm not reproducing the issue with the patch applied. Rafael _______________________________________________ linux-pm mailing list linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/linux-pm
