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    SubjectRe: [PATCH] SATA / AHCI: Do not play with the link PM during suspend to RAM (was: Re: HDD not suspending properly / dead on resume)
    Date
    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


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