[Xen-bugs] [Bug 1719] New: guest boot very slowly without limit dom0 cpu number on EX

[bugzilla-daemon@xxxxxxxxxxxxxxxxxxx]

http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=1719

           Summary: guest boot very slowly without limit dom0 cpu number on
                    EX
           Product: Xen
           Version: unstable
          Platform: Other
        OS/Version: Windows
            Status: NEW
          Severity: normal
          Priority: P1
         Component: HVM
        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): Linux/Windows
Change Set: 22764
Hardware: WSM-EX, NHM-EX


Bug detailed description:
--------------------------
In WSM-EX and NHM-EX platforms, if we did not limit max vcpus number of dom0,
guest will spend more time in bios before go to grub(about two minutes), it
will cost 5~8 minutes to boot up a guest. 

If limit dom0's vcpus with "dom0_max_vcpus=2" in xen grub line, guest boot
normally.

Long time ago, a guest boot slow issue opened on NHM-EX and Xiaowei fix it.


Reproduce steps:
----------------
1. install Xen on EX machine
2. boot to Xen/Dom0, (no limited dom0 vcpus)
3. create guest
4. guest OS is slow to boot


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


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


Basic root-causing log:


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