[Xen-bugs] [Bug 1690] New: guest boot very slowly when create two guests concurrently

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http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=1690

           Summary: guest boot very slowly when create two guests
                    concurrently
           Product: Xen
           Version: unstable
          Platform: All
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: HVM
        AssignedTo: xen-bugs@xxxxxxxxxxxxxxxxxxx
        ReportedBy: yang.z.zhang@xxxxxxxxx


Bug detailed description:
--------------------------
In our nightly test, we found boot multi-guest concurrently takes more time
than before. After investigation, we found it spend more times in bios before
go to grub(about two minutes). And we didn't see any defer when boot single
guest at a time.
This should be a regression. we checked it with changeset 22277 and didn't see
this issue.


Reproduce steps:
----------------
1.install latest xen 
2.prepare two config of hvm
3.using xm cr to create two guest concurrently


Current result:
----------------
takes more time to bootup

Expected result:
----------------
bootup as normal


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