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at I described above is just most of the
cases and maybe this is just random anyway.
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Title:
[Asus 1000HE] s2disk/hibernate hangs during s
a proper solution. Maybe special-case the freezing
> > of the flusher threads until all the writeout has completed. Or
> > something else.
>
> I've refreshed my memory wrt this bug and I believe the bug is really on
> the side of suspend-utils (uswsusp or ho
sion was that the bug is in there. This is arguable. I also
> >>>>>> wouldn't be opposed to a patch that sets the dirty limits to infinity
> >>>>>> from the ioctl that freezes the system or creates the image.
> >>>>>
> >>
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ally should find a proper solution. Maybe special-case the freezing
> >> of the flusher threads until all the writeout has completed. Or
> >> something else.
> >
> > I've refreshed my memory wrt this bug and I believe the bug is really on
> > the side of suspend-utils (uswsusp or however it is called). They are low
> > level system tools, they ask the kernel to freeze all processes
> > (SNAPSHOT_FREEZE ioctl), and then they rely on buffered writeback (which is
> > relatively heavyweight infrastructure) to work. That is wrong in my
> > opinion.
> >
> > I can see Johanness was suggesting in comment 11 to use O_SYNC in
> > suspend-utils which worked but was too slow. Indeed O_SYNC is rather big
> > hammer but using O_DIRECT should be what they need and get better
> > performance - no additional buffering in the kernel, no dirty throttling,
> > etc. They only need their buffer & device offsets sector aligned - they
> > seem to be even page aligned in suspend-utils so they should be fine. And
> > if the performance still sucks (currently they appear to do mostly random
> > 4k writes so it probably would for rotating disks), they could use AIO DIO
> > to get multiple pages in flight (as many as they dare to allocate buffers)
> > and then the IO scheduler will reorder things as good as it can and they
> > should get reasonable performance.
> >
> > Is there someone who works on suspend-utils these days? Because the repo
> > I've found on kernel.org seems to be long dead (last commit in 2012).
> >
> > Honza
> >
>
> Whether it's suspend-utils (or uswsusp) or not could be answered quickly
> by de-installing this package and using the kernel-methods instead.
>
>
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Title:
[Asus 1000HE] s2disk/hibernate hangs during saving of image data
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at the bug is in there. This is arguable. I also
> >>>>>> wouldn't be opposed to a patch that sets the dirty limits to infinity
> >>>>>> from the ioctl that freezes the system or creates the image.
> >>>>>
> >>>>>
ter solution.
Attached is a full console trace with various SysRq outputs, possibly
useful for analyzing.
BR, Oliver
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On 2014-04-29T20:20:21+
during saving of image data
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