Re: [asterisk-users] kernel: dahdi: Detected time shift.
On 11/25/10 7:12 AM, Jonas Kellens wrote: @ Shaun Ruffell : What do you mean by Wall time ? This server is indeed also time server (ntpd is running) Basically that the time on the server matches up with the time actual time you would see on a wall clock. Based on your response to Willaim Stillwell below, it sounds like it is keeping accurate wall time. @ Mark Deneen : No, no monitor attached. This is a Xen VPS. I do have a VPS interface, but this is also frozen when the server hangs... @ William Stillwell : I run Asterisk 1.6.2.10 with Dahdi 2.4.0 (as timing source). Time on my server seems very consistent. When doing /usr/sbin/ntpdate (once a month) there is a very very small offset. How often does this happen? Daily, Weekly, etc? Also, when you say the server freezes is it completely locked or can you make the caps lock key LED go on and off on your keyboard? Also, you said that this started occurring lately. Was there some other system change that was made about the time you noticed the problems start? -- Shaun Ruffell Digium, Inc. | Linux Kernel Developer 445 Jan Davis Drive NW - Huntsville, AL 35806 - USA Check us out at: www.digium.com www.asterisk.org -- _ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- New to Asterisk? Join us for a live introductory webinar every Thurs: http://www.asterisk.org/hello asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
Re: [asterisk-users] kernel: dahdi: Detected time shift.
Hello. Thank you for the feedback. To reply to all the information : @ Shaun Ruffell : What do you mean by Wall time ? This server is indeed also time server (ntpd is running) @ Mark Deneen : No, no monitor attached. This is a Xen VPS. I do have a VPS interface, but this is also frozen when the server hangs... @ William Stillwell : I run Asterisk 1.6.2.10 with Dahdi 2.4.0 (as timing source). Time on my server seems very consistent. When doing /usr/sbin/ntpdate (once a month) there is a very very small offset. Kind regards, Jonas. On 11/24/2010 06:22 PM, William Stillwell (Lists) wrote: I know there was a patch for dahdi to fix server lockups on time shift. (not sure what version, but if you changed the time, the server would just go crash.) Do you have the latest version ? Check your ntpd settings to make sure your time isn't bouncing all over the place. William Stillwell *From:* asterisk-users-boun...@lists.digium.com [mailto:asterisk-users-boun...@lists.digium.com] *On Behalf Of *Jonas Kellens *Sent:* Wednesday, November 24, 2010 11:44 AM *To:* Asterisk Users Mailing List - Non-Commercial Discussion *Subject:* [asterisk-users] kernel: dahdi: Detected time shift. Hello list, I'm experiencing a lot of server freezes lately. The server just... freezes. I notice in the log files (/var/log/asterisk/messages /var/log/messages) that logging stops at the time the server hangs. Logging continues when the server has been restarted (which is the only solution). So it is not a proces that hangs, it's the entire server (CentOS5.5 + Asterisk + MySQL). I really have no idea what can be causing these sudden freezes. Memory stays mostly at 250MB of 512 MB total, CPU is 97% to 100% idle... /var/log/asterisk/debug tells me nothing, no lines that indicate something strange before the freeze (debug level 9). I have no core.pid file in /tmp, when I look after rebooting the server. The only thing I have is a high level of mentionning of kernel: dahdi: Detected time shift. in /var/log/messages. What is causing this kernel message ? Could this be the cause of the server freeze ? Thank you for every feedback you can give me. Kind regards, Jonas. -- _ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- New to Asterisk? Join us for a live introductory webinar every Thurs: http://www.asterisk.org/hello asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
[asterisk-users] kernel: dahdi: Detected time shift.
Hello list, I'm experiencing a lot of server freezes lately. The server just... freezes. I notice in the log files (/var/log/asterisk/messages /var/log/messages) that logging stops at the time the server hangs. Logging continues when the server has been restarted (which is the only solution). So it is not a proces that hangs, it's the entire server (CentOS5.5 + Asterisk + MySQL). I really have no idea what can be causing these sudden freezes. Memory stays mostly at 250MB of 512 MB total, CPU is 97% to 100% idle... /var/log/asterisk/debug tells me nothing, no lines that indicate something strange before the freeze (debug level 9). I have no core.pid file in /tmp, when I look after rebooting the server. The only thing I have is a high level of mentionning of kernel: dahdi: Detected time shift. in /var/log/messages. What is causing this kernel message ? Could this be the cause of the server freeze ? Thank you for every feedback you can give me. Kind regards, Jonas. -- _ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- New to Asterisk? Join us for a live introductory webinar every Thurs: http://www.asterisk.org/hello asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
Re: [asterisk-users] kernel: dahdi: Detected time shift.
On Wed, Nov 24, 2010 at 11:43 AM, Jonas Kellens jonas.kell...@telenet.be wrote: Hello list, I'm experiencing a lot of server freezes lately. The server just... freezes. I notice in the log files (/var/log/asterisk/messages /var/log/messages) that logging stops at the time the server hangs. Logging continues when the server has been restarted (which is the only solution). So it is not a proces that hangs, it's the entire server (CentOS5.5 + Asterisk + MySQL). I really have no idea what can be causing these sudden freezes. Memory stays mostly at 250MB of 512 MB total, CPU is 97% to 100% idle... /var/log/asterisk/debug tells me nothing, no lines that indicate something strange before the freeze (debug level 9). I have no core.pid file in /tmp, when I look after rebooting the server. The only thing I have is a high level of mentionning of kernel: dahdi: Detected time shift. in /var/log/messages. What is causing this kernel message ? Could this be the cause of the server freeze ? Thank you for every feedback you can give me. Jonas, Do you have a monitor attached to the server? If the kernel is crashing, you might be able to catch the stack trace there. -M -- _ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- New to Asterisk? Join us for a live introductory webinar every Thurs: http://www.asterisk.org/hello asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
Re: [asterisk-users] kernel: dahdi: Detected time shift.
On 11/24/2010 10:43 AM, Jonas Kellens wrote: Hello list, I'm experiencing a lot of server freezes lately. The server just... freezes. I notice in the log files (/var/log/asterisk/messages /var/log/messages) that logging stops at the time the server hangs. Logging continues when the server has been restarted (which is the only solution). So it is not a proces that hangs, it's the entire server (CentOS5.5 + Asterisk + MySQL). I really have no idea what can be causing these sudden freezes. Memory stays mostly at 250MB of 512 MB total, CPU is 97% to 100% idle... /var/log/asterisk/debug tells me nothing, no lines that indicate something strange before the freeze (debug level 9). I have no core.pid file in /tmp, when I look after rebooting the server. The only thing I have is a high level of mentionning of kernel: dahdi: Detected time shift. in /var/log/messages. What is causing this kernel message ? Could this be the cause of the server freeze ? When a system does not have a hardware device installed DAHDI uses the system time in order to approximate a telephony clock source (what was previously referred to as dahdi_dummy). Since it uses the system time to accomplish this, if there is a large gap in the time (typically because NTP is adjusting the time) DAHDI just reports that it thinks it's very far behind or ahead of where it should be, and doesn't even try to mix any audio for that interval. So, I think the detected time shift is more a symptom of something else causing locks as opposed to the source. Is your server keeping accurate wall-time? -- Shaun Ruffell Digium, Inc. | Linux Kernel Developer 445 Jan Davis Drive NW - Huntsville, AL 35806 - USA Check us out at: www.digium.com www.asterisk.org -- _ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- New to Asterisk? Join us for a live introductory webinar every Thurs: http://www.asterisk.org/hello asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
Re: [asterisk-users] kernel: dahdi: Detected time shift.
On 11/24/2010 11:02 AM, Shaun Ruffell wrote: On 11/24/2010 10:43 AM, Jonas Kellens wrote: The only thing I have is a high level of mentionning of kernel: dahdi: Detected time shift. in /var/log/messages. What is causing this kernel message ? Could this be the cause of the server freeze ? When a system does not have a hardware device installed DAHDI uses the system time in order to approximate a telephony clock source (what was previously referred to as dahdi_dummy). Since it uses the system time to accomplish this, if there is a large gap in the time (typically because NTP is adjusting the time) DAHDI just reports that it thinks it's very far behind or ahead of where it should be, and doesn't even try to mix any audio for that interval. So, I think the detected time shift is more a symptom of something else causing locks as opposed to the source. Is your server keeping accurate wall-time? Another case where I regularly see detected time shift is when I'm running DAHDI in a virtual machine and go through a suspend / resume cycle. On resume when the system clock is updated DAHDI will notice the shift. -- Shaun Ruffell Digium, Inc. | Linux Kernel Developer 445 Jan Davis Drive NW - Huntsville, AL 35806 - USA Check us out at: www.digium.com www.asterisk.org -- _ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- New to Asterisk? Join us for a live introductory webinar every Thurs: http://www.asterisk.org/hello asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
Re: [asterisk-users] kernel: dahdi: Detected time shift.
I know there was a patch for dahdi to fix server lockups on time shift. (not sure what version, but if you changed the time, the server would just go crash.) Do you have the latest version ? Check your ntpd settings to make sure your time isn't bouncing all over the place. William Stillwell From: asterisk-users-boun...@lists.digium.com [mailto:asterisk-users-boun...@lists.digium.com] On Behalf Of Jonas Kellens Sent: Wednesday, November 24, 2010 11:44 AM To: Asterisk Users Mailing List - Non-Commercial Discussion Subject: [asterisk-users] kernel: dahdi: Detected time shift. Hello list, I'm experiencing a lot of server freezes lately. The server just... freezes. I notice in the log files (/var/log/asterisk/messages /var/log/messages) that logging stops at the time the server hangs. Logging continues when the server has been restarted (which is the only solution). So it is not a proces that hangs, it's the entire server (CentOS5.5 + Asterisk + MySQL). I really have no idea what can be causing these sudden freezes. Memory stays mostly at 250MB of 512 MB total, CPU is 97% to 100% idle... /var/log/asterisk/debug tells me nothing, no lines that indicate something strange before the freeze (debug level 9). I have no core.pid file in /tmp, when I look after rebooting the server. The only thing I have is a high level of mentionning of kernel: dahdi: Detected time shift. in /var/log/messages. What is causing this kernel message ? Could this be the cause of the server freeze ? Thank you for every feedback you can give me. Kind regards, Jonas. -- _ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- New to Asterisk? Join us for a live introductory webinar every Thurs: http://www.asterisk.org/hello asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
