Public bug reported:
I seem to be affected by a bug similar to (or the same as) #79599 and
#290184. I'm reporting this separately because those two bugs have been
marked as "Rejected" and "Invalid", in one case with the observation
that the bug policy requires a new bug to be filed when the original
reporter is no longer seeing the problem. Also, I think I may have a
lead on what is causing this issue.
My system: Acer Aspire 5100 laptop, 2 GB RAM, Intrepid amd64, kernel
2.6.27-11-generic #1 SMP Wed Apr 1 20:53:41 UTC 2009, ATI fglrx driver
is the only proprietary module, running Gnome and Metacity with
compositing enabled.
When I boot the system it is pretty fast. I can launch lots of programs
and they don't take up the full 2 GB of memory, so a good fraction of it
is used as cache and the swap space is empty.
After a suspend-to-ram and resume, only the first 1 GB of RAM is in use,
and the swap is heavily used (about 800 MB is typical). I think this
swapping is what accounts for the slowness and he heavy disk activity
people are seeing.
In my case, the resume time can vary from about 5 seconds to >15 minutes
(I cold-booted that time rather than keep waiting).
At a guess, it looks as if the suspend code thinks the suspended RAM
can't exceed 1 GB. So when the system suspends, it swaps out everything
above 1 GB. Resume is then very slow because critical parts of the OS
need to get pulled back in from swap, and the system runs slowly after
resume for the same reason. Strangely, the usage of real RAM tends to
stay below 1 GB even after the machine has been running post-resume, so
performance doesn't recover very well.
It may be relevant that my system was installed with only 1 GB of RAM in
it, and upgraded to 2 GB after the install.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
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Very slow suspend-to-ram, poor VM allocation
https://bugs.launchpad.net/bugs/367520
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