Solved

Unexpected Clocksource tsc unstable message, freezes system

Posted on 2008-10-14
2
1,925 Views
Last Modified: 2013-12-06
On one of my machines (Virtual machine running Debian on VMWare ESX OS), I unexpectedly got: "Clocksource tsc unstable (detlta = 4689558902 ns)" on my console.

I was able to get a login prompt with SSH, but after entering the username, the system freezes.

Resetting the VM in the VMWare console restored the VM to normal behaviour, but i would like to a) understand the error message and b) prevent it from happening again.

Can anybody shed some light on this for me? Using kernel 2.6.22-2-686 from the SID distribution, its a high volume production mail server. Some updates have been performed today but nothing really comes to mind that could be the culprit. Could it be a change on the VM host?
0
Comment
Question by:Xyptilon2
2 Comments
 
LVL 17

Accepted Solution

by:
owensleftfoot earned 500 total points
Comment Utility
TSC=Time Stamp Counter. Processors have dynamically changed clock speed (ofc to save power). The TSC is supposed to tick at the CPU rate (unless it's a constant_tsc, see /proc/cpuinfo flags, so on frequency change, this ought to happen. The kernel will automatically switch to something else.

To fix it you could try adding acpi=off to the end of the kernel boot in grub.conf
0
 
LVL 5

Expert Comment

by:sykesjs
Comment Utility
For Ubuntu users, the file you need to edit is /boot/grub/menu.lst
0

Featured Post

6 Surprising Benefits of Threat Intelligence

All sorts of threat intelligence is available on the web. Intelligence you can learn from, and use to anticipate and prepare for future attacks.

Join & Write a Comment

David Varnum recently wrote up his impressions of PRTG, based on a presentation by my colleague Christian at Tech Field Day at VMworld in Barcelona. Thanks David, for your detailed and honest evaluation!
In this article, I will show you HOW TO: Create your first Windows Virtual Machine on a VMware vSphere Hypervisor 6.5 (ESXi 6.5) Host Server, the Windows OS we will install is Windows Server 2016.
Advanced tutorial on how to run the esxtop command to capture a batch file in csv format in order to export the file and use it for performance analysis. He demonstrates how to download the file using a vSphere web client (or vSphere client) and exp…
This tutorial will walk an individual through the steps necessary to enable the VMware\Hyper-V licensed feature of Backup Exec 2012. In addition, how to add a VMware server and configure a backup job. The first step is to acquire the necessary licen…

762 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

9 Experts available now in Live!

Get 1:1 Help Now