Re: Clock jumps

2010-06-02 Thread Orion Poplawski
on a CentOS 5.5 host whose clock jumps about 8-12 hours a couple times a day. I have no idea what is causing it. Fedora 12 and Centos 5.5 KVM machines run fine on the same host. Is there any debugging I can enable to see what is jumping the clock? kvm-clock: cpu 0, msr 0:1ba4741, boot clock kvm-clock

Re: Clock jumps

2010-05-27 Thread john stultz
On Thu, May 27, 2010 at 11:32 AM, Bernhard Schmidt be...@birkenwald.de wrote: Alexander Graf ag...@suse.de wrote: Do you have ntpd running inside the guest? I have a bug report lying around about 2.6.33 with kvm-clock jumping in time when ntpd is used:

Re: Clock jumps

2010-05-27 Thread Zachary Amsden
On 05/27/2010 08:32 AM, Bernhard Schmidt wrote: Alexander Grafag...@suse.de wrote: Hi, Do you have ntpd running inside the guest? I have a bug report lying around about 2.6.33 with kvm-clock jumping in time when ntpd is used: https://bugzilla.novell.com/show_bug.cgi?id=582260 I

Re: Clock jumps

2010-05-27 Thread Bernhard Schmidt
On 27.05.2010 21:08, john stultz wrote: Hi John, I'd be very interested in hearing more about the host side issue. So this happened with the same kernel that you were using before, with no trouble? Correct. Could you also send dmesg output from this boot? And if you can find any older

Re: Clock jumps

2010-05-27 Thread Bernhard Schmidt
On 27.05.2010 23:53, Zachary Amsden wrote: Hello Zachary, I have server side fixes for this kvm-clock which seem to give me a stable clock on this machine, but for true SMP stability, you will need Glauber's guest side changes to kvmclock as well. It is impossible to guarantee strictly

Re: Clock jumps

2010-05-27 Thread Zachary Amsden
On 05/27/2010 12:12 PM, Bernhard Schmidt wrote: On 27.05.2010 23:53, Zachary Amsden wrote: Hello Zachary, I have server side fixes for this kvm-clock which seem to give me a stable clock on this machine, but for true SMP stability, you will need Glauber's guest side changes to kvmclock as

Re: Clock jumps

2010-05-27 Thread Zachary Amsden
On 05/27/2010 12:12 PM, Bernhard Schmidt wrote: On 27.05.2010 23:53, Zachary Amsden wrote: Hello Zachary, I have server side fixes for this kvm-clock which seem to give me a stable clock on this machine, but for true SMP stability, you will need Glauber's guest side changes to kvmclock as

Re: Clock jumps

2010-05-27 Thread john stultz
On Thu, 2010-05-27 at 23:48 +0200, Bernhard Schmidt wrote: On 27.05.2010 21:08, john stultz wrote: I'd be very interested in hearing more about the host side issue. So this happened with the same kernel that you were using before, with no trouble? Correct. Could you also send dmesg

Re: Clock jumps

2010-05-27 Thread Bernhard Schmidt
On 28.05.2010 02:00, john stultz wrote: Hi John, Looking at the diff: --- dmesg-lenny 2010-05-27 16:45:33.0 -0700 +++ dmesg-squeeze 2010-05-27 16:46:14.0 -0700 @@ -132,8 +132,8 @@ console [ttyS1] enabled hpet clockevent registered Fast TSC calibration using PIT

Re: Clock jumps

2010-05-27 Thread john stultz
On Fri, 2010-05-28 at 02:33 +0200, Bernhard Schmidt wrote: On 28.05.2010 02:00, john stultz wrote: Looking at the diff: --- dmesg-lenny 2010-05-27 16:45:33.0 -0700 +++ dmesg-squeeze 2010-05-27 16:46:14.0 -0700 @@ -132,8 +132,8 @@ console [ttyS1] enabled hpet

Re: Clock jumps

2010-05-26 Thread Orion Poplawski
On 05/25/2010 12:21 AM, Gleb Natapov wrote: Adding kvm to CC. On Mon, May 24, 2010 at 04:06:32PM +, Orion Poplawski wrote: I have a KVM virtual machine running 2.6.33.4-95.fc13.x86_64 on a CentOS 5.5 host whose clock jumps about 8-12 hours a couple times a day. I have no idea what

Re: Clock jumps

2010-05-26 Thread Alexander Graf
On 26.05.2010, at 19:10, Orion Poplawski wrote: On 05/25/2010 12:21 AM, Gleb Natapov wrote: Adding kvm to CC. On Mon, May 24, 2010 at 04:06:32PM +, Orion Poplawski wrote: I have a KVM virtual machine running 2.6.33.4-95.fc13.x86_64 on a CentOS 5.5 host whose clock jumps about 8-12

Re: Clock jumps

2010-05-26 Thread Orion Poplawski
On 05/26/2010 11:31 AM, Alexander Graf wrote: Do you have ntpd running inside the guest? I have a bug report lying around about 2.6.33 with kvm-clock jumping in time when ntpd is used: https://bugzilla.novell.com/show_bug.cgi?id=582260 Alex I've used ntpd and chronyd. I haven't tried

Re: Clock jumps

2010-05-26 Thread Orion Poplawski
on a CentOS 5.5 host whose clock jumps about 8-12 hours a couple times a day. I have no idea what is causing it. Fedora 12 and Centos 5.5 KVM machines run fine on the same host. Is there any debugging I can enable to see what is jumping the clock? kvm-clock: cpu 0, msr 0:1ba4741, boot clock kvm-clock

Re: Clock jumps

2010-05-25 Thread Gleb Natapov
Adding kvm to CC. On Mon, May 24, 2010 at 04:06:32PM +, Orion Poplawski wrote: I have a KVM virtual machine running 2.6.33.4-95.fc13.x86_64 on a CentOS 5.5 host whose clock jumps about 8-12 hours a couple times a day. I have no idea what is causing it. Fedora 12 and Centos 5.5 KVM