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http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=1784

Summary: Poor performance when do guest save/restore and
migration with linux 3.1 dom0
Product: Xen
Version: unstable
Platform: x86-64
OS/Version: Linux
Status: NEW
Severity: normal
Priority: P2
Component: HVM
AssignedTo: xen-bugs@lists.xensource.com
ReportedBy: xudong.hao@intel.com


Environment:
------------
Service Arch (ia32/ia32e/IA64): ia32e
Guest Arch (ia32/ia32e/IA64): ia32e
Guest OS Type (Linux/Windows): RHEL6u1
Change Set: 23791
Dom0 commit: linux upstream 3.1.0-rc3 671ee7f0ce62e4b991b47fcf1c161c3f710dabbc
Hardware: Westmere-EP
Other:


Bug detailed description:
--------------------------
I create a rhel6u1 guest, then do the save/restore and
migration, it takes quite a lot of time to finish the process. The network
works well after the save/restore and migration. please see the performance
comparison between linux pvops 2.6.32 and 3.1.0-rc3 as below.

Data below is based on WSM-EP
==============================================================
kernel version save restore migration
==============================================================
vmlinux-2.6-xen 19s 14s 30s
vmlinux-3.1.0-rc3+ 54s 26s 75s
==============================================================



Reproduce steps:
----------------
1. create a guest
2. do the save/restore or migration


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