OK, I was able to boot bzip2-compressed PAE kernel without any problems
on 12MB system (VMWare of course) with those changes. Due to
insufficient memory loader(8) whined about not being able to load
symbols, but apparently this error is not fatal and kernel booted just fine.
-Maxim
John Baldwin wrote:
On Monday 19 December 2005 11:32 pm, Maxim Sobolev wrote:
John Baldwin wrote:
On Monday 19 December 2005 01:32 pm, Maxim Sobolev wrote:
John Baldwin wrote:
On Monday 19 December 2005 04:26 am, Maxim Sobolev wrote:
sobomax 2005-12-19 09:26:42 UTC
FreeBSD src repository
Modified files:
sys/boot/i386/loader main.c
Log:
If LOADER_BZIP2_SUPPORT is defined allocate heap in the 1MB-4MB
range to provide enough room for decompression (up to 2.5MB is
necessary). This should be safe to do since we load i386 kernels after
8MB mark now, so that 16MB is the minimum amount of RAM necessary to
even boot FreeBSD.
Err, I thought we loaded PAE kernels at 2MB and non-PAE kernels at 4MB
to skip the first PSE page (PSE pages are 2MB on PAE).
You are right, my mistake, sorry. In any case memory in the range
1MB-4MB can be used by default.
Errm, no it can't. PAE kernels (and amd64 kernels I think) are both
loaded at 2MB, so that only leaves memory in the range 1MB-2MB.
I see, did not know about amd64 (PAE is less a concern for me since it's
not a default kernel). What do you think about the following patch:
http://www.pbxpress.com/~sobomax/loader.diff
It moves heap to the top of the extended memory and teaches
i386_copyin() to avoid messing up this region, so that in low memory
situation it will just fail, not trash heap.
So, if I understand correctly, you're now sticking the heap at the last 3MB of
RAM. FYI, as long as you have a PPro or newer you can test booting a PAE
kernel. You don't have to have > 4GB of RAM. So, you can test this locally
to see if you can boot a PAE kernel (bzipped at that!) before committing.
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