Bug 700694 - guest time drift under load
Summary: guest time drift under load
Keywords:
Status: CLOSED NOTABUG
Alias: None
Product: Red Hat Enterprise Linux 5
Classification: Red Hat
Component: kvm
Version: 5.7
Hardware: Unspecified
OS: Unspecified
medium
medium
Target Milestone: rc
: ---
Assignee: Virtualization Maintenance
QA Contact: Virtualization Bugs
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2011-04-29 03:23 UTC by Xiaoqing Wei
Modified: 2011-05-13 09:32 UTC (History)
4 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2011-05-13 08:41:49 UTC
Target Upstream Version:

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Description Xiaoqing Wei 2011-04-29 03:23:12 UTC 
Description of problem:
boot a guest,run load on it for a while,guest will time drift for a few seconds

Version-Release number of selected component (if applicable):
kvm-83-224.el5_6.1

How reproducible:

mostly
Steps to Reproduce:
1.boot a guest by :
qemu-kvm -name 'vm1' -monitor stdio .....


2.run load on guest ,eg: play hd video 
3.
  
Actual results:
guest time drift

Expected results:
guest time accurate

Additional info:

kernel-2.6.18-238.9.1.el5
kvm-83-224.el5_6.1



guest info :OS WINXP
full cmd :
qemu-kvm -name 'vm1' -monitor stdio -serial unix:'/tmp/serial-20110425-144552-JMbU',server,nowait -drive file='/usr/local/staf/test/RHEV/kvm/autotest/client/tests/kvm/images/winXP-32.qcow2',index=0,if=ide,media=disk,cache=none,format=qcow2 -net nic,vlan=0,model=rtl8139,macaddr='9a:b5:b1:9b:f2:ac' -net tap,vlan=0,ifname='t0-144552-JMbU',script='/usr/local/staf/test/RHEV/kvm/autotest/client/tests/kvm/scripts/qemu-ifup-switch',downscript='no' -m 32768 -smp 4,cores=1,threads=1,sockets=4 -drive file='/usr/local/staf/test/RHEV/kvm/autotest/client/tests/kvm/isos/windows/winutils.iso',media=cdrom,index=1 -cpu qemu64,+sse2 -soundhw ac97 -redir tcp:5001::10023 -spice port=8001,disable-ticketing -qxl 1 -rtc-td-hack -M rhel5.6.0 -boot c  -usbdevice tablet
Comment 1 Xiaoqing Wei 2011-05-09 03:12:48 UTC 
also hit this issue on :
kernel-2.6.18-259.el5
kvm-83-232.el5
Comment 2 Xiaoqing Wei 2011-05-13 08:41:49 UTC 
time drift approx. 2.x sec, is acceptable.close this bug
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