Bug 998108
| Summary: | Let's enable kvmclock in RHEL 6 | |||
|---|---|---|---|---|
| Product: | Red Hat Enterprise Linux 6 | Reporter: | Richard W.M. Jones <rjones> | |
| Component: | libguestfs | Assignee: | Richard W.M. Jones <rjones> | |
| Status: | CLOSED ERRATA | QA Contact: | Virtualization Bugs <virt-bugs> | |
| Severity: | unspecified | Docs Contact: | ||
| Priority: | unspecified | |||
| Version: | 6.5 | CC: | bfan, leiwang, lkong, rjones, walters, wshi | |
| Target Milestone: | rc | |||
| Target Release: | --- | |||
| Hardware: | Unspecified | |||
| OS: | Unspecified | |||
| Whiteboard: | ||||
| Fixed In Version: | libguestfs-1.20.10-3.el6 | Doc Type: | Bug Fix | |
| Doc Text: |
Cause: Using libguestfs on heavily loaded machines.
Consequence: You might see messages about "unstable clocks" appearing, especially in debugging output.
Fix: Ensure that kvmclock is enabled.
Result: Messages about "unstable clocks" should be reduced or eliminated by this change.
|
Story Points: | --- | |
| Clone Of: | 998065 | |||
| : | 998109 (view as bug list) | Environment: | ||
| Last Closed: | 2013-11-21 04:46:52 UTC | Type: | Bug | |
| 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: | 998109 | |||
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Description
Richard W.M. Jones
2013-08-17 09:36:34 UTC
Hello Rich,
Could you tell me how can I tell it works? I only find some message from boot debug logs.
"
-cpu host,+kvmclock \
...
kvm-clock: Using msrs 4b564d01 and 4b564d00
kvm-clock: cpu 0, msr 0:1c247c1, boot clock
kvm-clock: cpu 0, msr 0:22167c1, primary cpu clock
[ 0.381003] Switching to clocksource kvm-clock
"
Is it enough?
(In reply to bfan from comment #1) > Hello Rich, > Could you tell me how can I tell it works? https://rwmj.wordpress.com/2010/10/15/kvm-pvclock/#content > I only find some message from > boot debug logs. > > " > -cpu host,+kvmclock \ > ... > kvm-clock: Using msrs 4b564d01 and 4b564d00 > kvm-clock: cpu 0, msr 0:1c247c1, boot clock > kvm-clock: cpu 0, msr 0:22167c1, primary cpu clock > [ 0.381003] Switching to clocksource kvm-clock > " > Is it enough? This is sufficient to verify the bug fix IMHO. Verify this bug according to #comment 2 libguestfs-1.20.11-2.el6.x86_64 [root@dhcp-9-42 home]# guestfish -x -v -N fs > boot.log 2>&1 [root@dhcp-9-42 home]# cat boot.log | grep -Ei "kvmclock|kvm-clock" -cpu host,+kvmclock \ kvm-clock: Using msrs 4b564d01 and 4b564d00 kvm-clock: cpu 0, msr 0:1c247c1, boot clock kvm-clock: cpu 0, msr 0:22167c1, primary cpu clock [ 0.153354] Switching to clocksource kvm-clock So change the status to verified Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. http://rhn.redhat.com/errata/RHSA-2013-1536.html |