linux-kernel - Re: [PATCH v8]: Improve performance of LZO/plain hibernation

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Date:	Thu, 13 Oct 2011 22:00:28 +1100
From:	"Bojan Smojver" <bojan@...ursive.com>
To:	rjw@...k.pl
Cc:	linux-kernel@...r.kernel.org, linux-pm@...ts.linux-foundation.org
Subject: Re: [PATCH v8]: Improve performance of LZO/plain hibernation

------- 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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