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Bug 698545

Summary: migrate vm to file twice when vm stopped,file size differs
Product: Red Hat Enterprise Linux 6 Reporter: Xiaoqing Wei <xwei>
Component: qemu-kvmAssignee: Juan Quintela <quintela>
Status: CLOSED NOTABUG QA Contact: Virtualization Bugs <virt-bugs>
Severity: medium Docs Contact:
Priority: medium    
Version: 6.1CC: akong, ehabkost, gcosta, juzhang, michen, mkenneth, shu, tburke, virt-maint
Target Milestone: rc   
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of:
: 713104 (view as bug list) Environment:
Last Closed: 2012-03-13 14:26:05 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On:    
Bug Blocks: 713104    

Description Xiaoqing Wei 2011-04-21 08:07:22 UTC 
Description of problem:
when a vm is running,type stop in monitor,
after vm stopped,migrate to file twice ,file size differs

Version-Release number of selected component (if applicable):

qemu-kvm-0.12.1.2-2.158.el6.x86_64
How reproducible:
100%

Steps to Reproduce:
1.boot a guest
qemu-kvm -name 'rhel47-32' -monitor stdio -E,path=/tmp/serial-20110420-134929-ocyE,server,nowait -device isa-serial,chardev=E -drive file='2.qcow2',werror=stop,rerror=stop,index=0,if=ide,cache=unsafe -device rtl8139,netdev=idvjxRgD,mac=9a:fe:9d:9b:1e:a4,id=ndev00idvjxRgD,bus=pci.0,addr=0x3 -netdev tap,id=idvjxRgD,ifname='t0',script='/.',downscript='no' -m 4096 -smp 4,cores=2,threads=1,sockets=2 -cpu cpu64-rhel6,+sse2,+x2apic -vnc :0 -rtc base=utc,clock=host,driftfix=none -M rhel6.1.0 -boot order=cdn,once=c,menu=off   -usbdevice tablet -no-kvm-pit-reinjection -enable-kvm  


2. after guest fully booted,type "stop" in monitor
3. exec     "migrate -d "exec:gzip -c > /tmp/mig1.gz"
after finish migration,do 
  "migrate -d "exec:gzip -c > /tmp/mig2.gz"
Actual results:
/tmp/mig1    /tmp/mig2    size differs

ll /tmp/mig*

-rw-r--r--. 1 root root 2503468 Apr 21 12:45 /tmp/mig1.gz
-rw-r--r--. 1 root root 2503467 Apr 21 12:45 /tmp/mig2.gz

[root@rhel6xwei tmp]# md5sum  mig*
c268c82cce9b83f2a5b7f7b339ad39f5  mig1.gz
22705f6213f6de1b25cd091869e11641  mig2.gz

Expected results:
mig1.gz mig2.gz  size the same,md5sum the same.

Additional info:
host info :kernel-2.6.32-130.el6.x86_64
processor       : 3
vendor_id       : GenuineIntel
cpu family      : 6
model           : 23
model name      : Intel(R) Core(TM)2 Quad CPU    Q9400  @ 2.66GHz
stepping        : 10
cpu MHz         : 2660.161
cache size      : 3072 KB

guest info : OS rhel4.9-32 / Win2008-64
Comment 2 Juan Quintela 2011-06-08 09:37:46 UTC 
This wolud be fixed depending on capacity.  Basically we don't care about what is on the image, and it can change depending of timing.  It is possible to have it identical, but not a priority.
Comment 4 Dor Laor 2012-03-13 14:26:05 UTC 
It's not a bug, the amount of ram saved depends on the guest scheduling and even the content (same page of identical bytes).