[Bug 25428] New: Memory allocation issue when working with a PAE kernel

http://bugs.winehq.org/show_bug.cgi?id=25428

Summary: Memory allocation issue when working with a PAE kernel
           Product: Wine
           Version: 1.3.7
          Platform: x86
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: -unknown
        AssignedTo: [e-mail]
        ReportedBy: [e-mail]

Created an attachment (id=32366)
 --> (http://bugs.winehq.org/attachment.cgi?id=32366)
Memory allocation test program.

It seems that when using wine with A PAE kernel on a system with enough memory
to put PAE into effect (e.g. 5GB), the maximum limit of memory that an
application can allocate is about 1.5GB. Using the same kernels on the same
system but with 3GB, the limit is 2GB.

I have created a small test that allocates memory with a step of 64MB with a
maximum total allocated space of 2GB. Then I compiled it both with winegcc and
gcc.

On the 3GB RAM setup, I could reach the MAX value, both with the winegcc and
the gcc compiled executable

On the 5GB RAM setup, the winegcc version stopped at ~1.5, while the gcc
version reached the MAX value.

Kernels tested:
2.6.31.12-rt21-avlinux-realtime-pae-rev3
2.6.36-liquorix-avlinux-pae

Wine versions tested:
1.3.5, 1.3.7

Known applications affected by this issue:
NI Kontakt 4

[Bug 25428] Memory allocation issue when working with a PAE kernel

http://bugs.winehq.org/show_bug.cgi?id=25428

--- Comment #1 from Alexandre Julliard  2010-12-05 05:05:46 CST ---
You should look at /proc/pid/maps and try to determine what's different.
Probably more things get allocated in the low 2Gb.

[Bug 25428] Memory allocation issue when working with a PAE kernel

http://bugs.winehq.org/show_bug.cgi?id=25428

--- Comment #2 from [e-mail] 2010-12-05 12:12:30 CST ---
(In reply to comment #1)
> You should look at /proc/pid/maps and try to determine what's different.
> Probably more things get allocated in the low 2Gb.

will do and provide more feedback, although for now I can only spot the
differences (I don't know what exactly I am looking for). Should I run wine
with some specific options to provide more useful information? If so, please
advise.

One thing I forgot to mention, to use the attached test, take care to compile
with the -O0 option to remove optimizations, so that memory allocation really
occurs.

[Bug 25428] Memory allocation issue when working with a PAE kernel

http://bugs.winehq.org/show_bug.cgi?id=25428

--- Comment #3 from [e-mail] 2010-12-07 14:28:54 CST ---
Created an attachment (id=32399)
 --> (http://bugs.winehq.org/attachment.cgi?id=32399)
memory maps of test with PAE (5GB RAM)

[Bug 25428] Memory allocation issue when working with a PAE kernel

http://bugs.winehq.org/show_bug.cgi?id=25428

--- Comment #4 from [e-mail] 2010-12-07 14:30:37 CST ---
Created an attachment (id=32400)
 --> (http://bugs.winehq.org/attachment.cgi?id=32400)
memory maps of test without PAE (3GB RAM)

The kernel actually is PAE, but due to 3GB total RAM it seems that PAE does not
affect the test

[Bug 25428] Memory allocation issue when working with a PAE kernel

http://bugs.winehq.org/show_bug.cgi?id=25428

--- Comment #5 from Alexandre Julliard  2010-12-07 17:08:12 CST ---
Looks like the kernel doesn't want to map things under 37000000 or so. You
could confirm this by running the Linux version of your app until you run out
of space. If there's still a big chunk free after that it's a kernel issue.

[Bug 25428] Memory allocation issue when working with a PAE kernel

http://bugs.winehq.org/show_bug.cgi?id=25428

--- Comment #6 from [e-mail] 2010-12-08 12:49:38 CST ---
(In reply to comment #5)
> Looks like the kernel doesn't want to map things under 37000000 or so. You
> could confirm this by running the Linux version of your app until you run out
> of space. If there's still a big chunk free after that it's a kernel issue.

When I run the gcc compiled version, on the 5GB RAM-PAE setup, it allocates 2GB
without problem. I 've been using the 2GB max allocation value, because I think
this is the memory limit for an application running with wine and I wanted to
have a common ground for the test when it is gcc and winegcc compiled.

If I raise the max memory allocation value, I can go up to 3GB allocation,
which is the max that a userspace app can get, no matter if the kernel is PAE
or not. Also when the test is gcc compiled and runs with 5GB RAM available, the
kernel maps things in the low memory range (see new attachment).

When I reach the 3GB limit for the test (gcc compiled, 5GB PAE), the system has
about 1.5GB free RAM. So I guess that in this case, there is enough free memory
available, but it is the userspace app memory limit which terminates the test.

[Bug 25428] Memory allocation issue when working with a PAE kernel

http://bugs.winehq.org/show_bug.cgi?id=25428

--- Comment #7 from [e-mail] 2010-12-08 12:51:00 CST ---
Created an attachment (id=32414)
 --> (http://bugs.winehq.org/attachment.cgi?id=32414)
memory maps for test, gcc compiled, 5GB RAM, PAE kernel

[Bug 25428] Memory allocation issue when working with a PAE kernel

http://bugs.winehq.org/show_bug.cgi?id=25428

--- Comment #8 from Alexandre Julliard  2010-12-08 16:46:45 CST ---
Maybe the high load address for the wine loader confuses it. You could try
building the test app with the same -Wl,--section-start option that the wine
loader uses.

[Bug 25428] Memory allocation issue when working with a PAE kernel

http://bugs.winehq.org/show_bug.cgi?id=25428

--- Comment #9 from [e-mail] 2010-12-09 04:48:37 CST ---
(In reply to comment #8)
> Maybe the high load address for the wine loader confuses it. You could try
> building the test app with the same -Wl,--section-start option that the wine
> loader uses.

Could you provide some more info? Where can I find these values?

[Bug 25428] Memory allocation issue when working with a PAE kernel

http://bugs.winehq.org/show_bug.cgi?id=25428

--- Comment #10 from Alexandre Julliard  2010-12-09 05:34:00 CST ---
Link your binary with -Wl,--section-start,.interp=0x7bf00400.

Actually I noticed your test app is using malloc, to test this issue you should
use mmap instead.

[Bug 25428] Memory allocation issue when working with a PAE kernel

http://bugs.winehq.org/show_bug.cgi?id=25428

--- Comment #11 from [e-mail] 2013-06-21 15:17:11 CDT ---
This ticket has not been updated for over 900 days.

Is this still an issue in wine version 1.6-rc3 or higher or is this to be
closed as abandoned ?

[Bug 25428] Memory allocation issue when working with a PAE kernel

https://bugs.winehq.org/show_bug.cgi?id=25428

Wylda  changed:

What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
                 CC|                            |[e-mail]
         Resolution|---                         |ABANDONED

--- Comment #12 from Wylda  ---
Abandoned.

[Bug 25428] Memory allocation issue when working with a PAE kernel

https://bugs.winehq.org/show_bug.cgi?id=25428

Wylda  changed:

What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |CLOSED

--- Comment #13 from Wylda  ---
Closing - abandoned.