On Saturday, July 10, 2010, Stephan Diestelhorst wrote: > Rafael J. Wysocki wrote: > > On Friday, July 09, 2010, Stephan Diestelhorst wrote: > > > I wrote: > > > > I have an issue with suspend to RAM and I/O load on a disk. Symptoms > > > > are that the disk does not respond to requests when woken up, producing > > > > only I/O errors on all tested kernels (newest 2.6.35-rc4 (Ubuntu > > > > mainline PPA build)): > > > > > > > <snip> > > > > > > > This can be triggered most reliably with multiple "direct" writes to > > > > disk, I create the load with the attached script. If the issue is > > > > triggered, suspend (through pm-suspend) takes very long. > > > > > > > IMHO the interesting log output during suspend is: > > > > [ 1674.700125] ata1.00: qc timeout (cmd 0xec) > > > > > > Almighty google suggested to try "pci=nomsi", which seems to have > > > cured the issue for me for now. Is that plausible? I'll keep this > > > under observation. > > > > Hmm. How does your /proc/interrupts look like? > > This has been yet another red herring. After trying out the kernel > option three times with two different kernels, it failed yet again > with the same symptoms. I thought it would be like that. > I have attached /proc/interrupts for 2.6.35-rc4, once with pci=nomsi > and once without, but again, I do not think this makes a difference :-/ > > > Also, do you have a link to this "Google suggestion"? > > It was some german forum, a guy with completely different HW, but the > same symptom. I thought trying out the option wouldn't hurt. > > Maybe it came for example from http://lkml.org/lkml/2008/12/20/3 > originally. 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? Also, what kind of disk do you use? Rafael -- To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
