I have available "ondemand, userspace, performance" We are using the default right now which is "ondemand"
Steve Timm -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Akemi Yagi Sent: Wednesday, April 03, 2013 10:45 AM To: scientific-linux-users Subject: Re: "Time went backwards" issues in SL5.9 kernel-xen and AMD On Wed, Apr 3, 2013 at 7:16 AM, Steven Timm <[email protected]> wrote: > Since upgrading to the 2.6.18-348.1.1 kernel I am seeing continuous > kernel exceptions of this form > > 2013-04-03T04:02:13-05:00 [email protected] kernel: Warning > Timer > ISR/1: T > ime went backwards: delta=-500760595 delta_cpu=67239405 > shadow=1879913420310320 > off=249335587 processed=1879914170340430 > cpu_processed=1879913602340430 > 2013-04-03T04:02:13-05:00 [email protected] kernel: 0: > 1879914170340430 > 2013-04-03T04:02:13-05:00 [email protected] kernel: 1: > 1879913602340430 > > > The system still is operational but the continuous error messages make > it difficult to diagnose any other problems that may be happening. > > This hardware dual AMD Opteron 6134, has been running SL5 with Xen > kernel ever since we bought it a year and a half ago and this is the > first time we have seen this error message. the error message happens > both in Xen Dom0 and Xen DomU's. We have three such identical > machines and they all have the error. > Our Intel-based hardware is not affected at all. > > Googling shows that there have been error messages of this sort that > come and go ever since the Xen kernel was able to run on > AMD64 hardware, and even a bugzilla against the upstream 5.6, but as > yet no fix available. Is anyone else seeing this error in the current > kernels? > > Steve Timm What options are available for CPU frequency governor on your system? cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_available_governors and which one are you using? Look in /etc/sysconfig/cpuspeed . Akemi
