Bug 517903
| Summary: | Add -no-kvm-pit-reinject in qemu cmdline for RHEL guests | ||
|---|---|---|---|
| Product: | Red Hat Enterprise Linux 5 | Reporter: | RHEL Program Management <pm-rhel> |
| Component: | libvirt | Assignee: | Daniel Veillard <veillard> |
| Status: | CLOSED ERRATA | QA Contact: | Virtualization Bugs <virt-bugs> |
| Severity: | medium | Docs Contact: | |
| Priority: | low | ||
| Version: | 5.4 | CC: | azarembo, berrange, nzhang, pm-eus, tburke, virt-maint, xen-maint |
| Target Milestone: | rc | Keywords: | ZStream |
| Target Release: | --- | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | Bug Fix | |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2009-09-02 13:59:38 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: | 517278 | ||
| Bug Blocks: | |||
|
Description
RHEL Program Management
2009-08-17 19:28:43 UTC
libvirt-0.6.3-20.1.el5_4 has been built in RHEL-5.4-Z-candidate with the fix, Daniel Verified with libvirt 0.6.3-20.1.el5_4 on RHEL-5.4:
1. Do not allow C2 state - "processor.max_cstate=1" as a host kernel boot option.
2. Add lpj=n for Linux guest kernel cmdLine.
3. Make sure something on host (No cpufreq & No c2 state):
[root@dhcp-66-70-85 ~]# cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq
2700000
[root@dhcp-66-70-85 ~]# grep MHz /proc/cpuinfo
cpu MHz : 2700.000
cpu MHz : 2700.000
[root@dhcp-66-70-85 ~]# cat /proc/cmdline
ro root=LABEL=/1 rhgb quiet processor.max_cstate=1
[root@dhcp-66-70-85 ~]# ps -ef | grep qemu-kvm
root 3632 1 42 17:12 ? 00:00:05 /usr/libexec/qemu-kvm -S -M pc -m 1024 -smp 1 -name rhel5u4 -uuid 1dcad2df-2b66-d69c-5387-ecba73400988 -no-kvm-pit-reinjection -monitor pty -pidfile /var/run/libvirt/qemu//rhel5u4.pid -boot c -drive file=/var/lib/libvirt/images/rhel5u4-kvm.img,if=ide,index=0,boot=on -net nic,macaddr=00:f2:31:87:56:28,vlan=0,model=rtl8139 -net tap,fd=15,script=,vlan=0,ifname=vnet0 -serial none -parallel none -usb -vnc 127.0.0.1:1 -k en-us
root 3661 1 41 17:12 ? 00:00:04 /usr/libexec/qemu-kvm -S -M pc -m 512 -smp 1 -name foo -uuid 5e983093-499b-562b-b446-102a2aeeb217 -no-kvm-pit-reinjection -monitor pty -pidfile /var/run/libvirt/qemu//foo.pid -boot c -drive file=/var/lib/libvirt/images/foo.img,if=ide,index=0,boot=on -net nic,macaddr=54:52:00:4e:3e:1a,vlan=0 -net tap,fd=17,script=,vlan=0,ifname=vnet1 -serial pty -parallel none -usb -vnc 127.0.0.1:2 -k en-us
[root@dhcp-66-70-85 ~]# cat /sys/devices/system/clocksource/clocksource0/current_clocksource
jiffies
4. Run a 100% cpu task on each cpu in 1 hour.
Begin time End time
Host: 09:20:03 - 10:21:26
Guest1: 09:20:01 - 10:21:23
Guest2: 09:20:02 - 10:21:27
As the results show there is a tiny clock skew in the guests. That seems acceptable. So move this bug to VERIFIED.
An advisory has been issued which should help the problem described in this bug report. This report is therefore being closed with a resolution of ERRATA. For more information on therefore solution and/or where to find the updated files, please follow the link below. You may reopen this bug report if the solution does not work for you. http://rhn.redhat.com/errata/RHBA-2009-1424.html |