[Xen-bugs] [Bug 1721] New: Only two 1GB-pages be allocated to a 10GBs memory guest

[bugzilla-daemon@xxxxxxxxxxxxxxxxxxx]

http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=1721

           Summary: Only two 1GB-pages be allocated to a 10GBs memory guest
           Product: Xen
           Version: unstable
          Platform: Other
        OS/Version: Windows
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Hypervisor
        AssignedTo: xen-bugs@xxxxxxxxxxxxxxxxxxx
        ReportedBy: shaohui.zheng@xxxxxxxxx


Environment:
------------
Service Arch (ia32/ia32e/IA64): ia32e
Guest Arch (ia32/ia32e/IA64): ia32e
Guest OS Type (Linux/Windows): RHEL5 
Hardware: WSM-EX

xen-changeset:   22764:75b6287626ee
xen-date:        Fri Jan 14 16:38:51 2011 +0000
xen-summary:     rcupdate: Make rcu_barrier() more paranoia-proof

pvops git: 
commit 862ef97190f6b54d35c76c93fb2b8fadd7ab7d68
Merge: 7835387... 5823a82...
Author: Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>
Date:   Mon Dec 6 14:56:48 2010 -0800

ioemu git: 
commit 1c304816043c0ffe14d20d6006d6165cb7fddb9b
Author: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
Date:   Tue Jan 11 18:48:58 2011 +0000


Bug detailed description:
--------------------------
After enalbe 1GB page in Xen, then create guest with 10GBs memory, we can see 7
1GB pages in xc info at the creating. 
[root@rismail7-mobl ~]# xl cr 1Gpage.hvm
Parsing config file 1Gpage.hvm
xc: info: VIRTUAL MEMORY ARRANGEMENT:
  Loader:        0000000000100000->0000000000179710
  TOTAL:         0000000000000000->000000027f800000
  ENTRY ADDRESS: 0000000000100000
xc: info: PHYSICAL MEMORY ALLOCATION:
  4KB PAGES: 0x0000000000000200
  2MB PAGES: 0x00000000000005fb
  1GB PAGES: 0x0000000000000007
Daemon running with PID 8905


However, "xl dmesg" only show 2 1GB pages in EPT p2m table.
[root@rismail7-mobl ~]# xl dmesg | grep "order: 18"
(XEN) gfn: 40000             mfn: 440000            order: 18  is_pod: 0
(XEN) gfn: 80000             mfn: 840000            order: 18  is_pod: 0

If we set 4GBs memory to guest, still only 2 1GB pages showed.

Reproduce steps:
----------------
1. enalbe hugepage in Xen (set "hap_1gb=1" in Xen grub line)
2. boot a guest with 10GBs memory
3. xl debug-key D
4. xl dmesg | grep "order: 18" (find the 1GB page number, only 2)

Current result:
----------------


Expected result:
----------------


Basic root-causing log:
----------------------


-- 
Configure bugmail: 
http://bugzilla.xensource.com/bugzilla/userprefs.cgi?tab=email
------- You are receiving this mail because: -------
You are the assignee for the bug, or are watching the assignee.

_______________________________________________
Xen-bugs mailing list
Xen-bugs@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-bugs