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SubjectRe: [PATCH v8]: Improve performance of LZO/plain hibernation
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------- Original message -------
> From: Rafael J. Wysocki
>> I get a kernel panic on a test box using a x86_64 kernel with this patch
>> applied.
>
> The panic happens during late resume, when trying to switch to the
> hibernated
> kernel.

In an effort to test this whole thing a bit more, I took today's kernel
from Linus' repo and applied v11 of my patch. I compiled this on a single
cpu machine this time, with 768 MB of memory (in today's terms, this laptop
would not pass as a smartphone :-), running F-16 beta.. The system has
radeon graphics (my other system, where I initially developed the patch,
has intel). Also, this was a 32-bit box, as opposed to my other system,
which is 64-bit.

I was getting kernel trouble on repeated hibernate/thaw cycles on both
systems when KMS was enabled. With nomodeset passed into the kernel, both
systems would go through 50+ cycles (this was my test loop) with no
trouble. Whether my patch was applied or not didn't matter - I was getting
trouble with Fedora supplied kernels as well, after a few cycles.

So, I don't know for sure, but it seems to me something is amiss in KMS
when it comes to hibernation.

--
Bojan


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