[Xen-bugs] [Bug 242] New: PAE XEN has strange behavior if dom0_mem=5120000

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http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=242

           Summary: PAE XEN has strange behavior if dom0_mem=5120000
           Product: Xen
           Version: unstable
          Platform: All
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Hypervisor
        AssignedTo: xen-bugs@xxxxxxxxxxxxxxxxxxx
        ReportedBy: jyoung5@xxxxxxxxxx


This is a new bug created as a jump off of bugzilla #209. In this bug there are
descriptions for this bug I will past below:

------- Additional Comment #2 From lge@xxxxxxxxxx 2005-09-13 18:56 [reply] 
-------

I've seen the exact same problems that David is seeing on my 8G RAM x86 box. 
It is a PAE enabled SLES9 SP2 box.

Here is the memory allocation setting of dom0 and domU I had problem with:

dom0: 5120 MB domU: 512 MB


But, with the following setting, both dom0 and domU work perfectly for me:

dom0: 512 MB domU: 5120 MB


The changeset is : 6739


------- Additional Comment #3 From Jerone Young 2005-09-19 19:20 [reply] -------

With todays hg pull I am no longer seeing these issues...but when I do set
dom0_mem=5120000 wehn you get to a certain point in Xen Linux kernel boot up you
get:

Freeing unused kernel memory: 356k freed
EXT3-fs: INFO: recovery required on readonly filesystem.
EXT3-fs: write access will be enabled during recovery.
EXT3-fs: recovery complete.
kjourald starting. Commit interval 5 seconds.
EXT3-fs: mounted filesystem with ordered data mode.

This same setup boots & works fine if I don't have dom0_mem specified or I have
it only specified to dom0_mem=512000.

I'm running a dual Opteron machine with Xen PAE and 6 gigs of RAM.

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