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Entry  Mon Aug 14 19:41:46 2017, Jamie, Update, CDS, front-end/DAQ network down for kernel upgrade, and timing errors 
    Reply  Wed Aug 16 17:05:53 2017, Jamie, Update, CDS, front-end/DAQ network down for kernel upgrade, and timing errors 2017-08-16-163725_1366x495_scrot.png
       Reply  Wed Aug 16 17:14:02 2017, Koji, Update, CDS, front-end/DAQ network down for kernel upgrade, and timing errors 
          Reply  Wed Aug 16 18:01:28 2017, Jamie, Update, CDS, front-end/DAQ network down for kernel upgrade, and timing errors 
             Reply  Wed Aug 16 18:06:01 2017, Koji, Update, CDS, front-end/DAQ network down for kernel upgrade, and timing errors 
       Reply  Wed Aug 16 18:50:58 2017, Jamie, Update, CDS, front-end/DAQ network down for kernel upgrade, and timing errors 2017-08-16-184910_1394x488_scrot.png
          Reply  Mon Aug 28 16:20:00 2017, gautam, Update, CDS, 40m files backup situation 
             Reply  Mon Aug 28 17:13:57 2017, ericq, Update, CDS, 40m files backup situation 
             Reply  Fri Sep 15 15:54:28 2017, gautam, Update, CDS, FB wiper script 
                Reply  Mon Sep 18 17:17:49 2017, gautam, Update, CDS, FB wiper script 
                   Reply  Mon Sep 18 17:30:54 2017, Chris, Update, CDS, FB wiper script wiper.pl
                      Reply  Mon Sep 18 17:51:26 2017, gautam, Update, CDS, FB wiper script perlDiff.png
                         Reply  Mon Sep 18 18:40:34 2017, gautam, Update, CDS, FB wiper script 
             Reply  Tue Sep 26 15:55:20 2017, gautam, Update, CDS, 40m files backup situation 
                Reply  Thu Sep 28 10:33:46 2017, gautam, Update, CDS, 40m files backup situation 
                   Reply  Thu Sep 28 11:13:32 2017, jamie, Update, CDS, 40m files backup situation 
                      Reply  Thu Sep 28 23:47:38 2017, gautam, Update, CDS, 40m files backup situation 
                         Reply  Fri Sep 29 11:07:16 2017, gautam, Update, CDS, 40m files backup situation 
                            Reply  Thu Oct 5 13:58:26 2017, gautam, Update, CDS, 40m files backup situation 
                               Reply  Fri Oct 6 12:46:17 2017, gautam, Update, CDS, 40m files backup situation 
                                  Reply  Sat Oct 28 00:36:26 2017, gautam, Update, CDS, 40m files backup situation - ddrescue 415E2F09-3962-432C-B901-DBCB5CE1F6B6.jpegBFF8F8B5-1836-4188-BDF1-DDC0F5B45B41.jpeg
Message ID: 13205     Entry time: Mon Aug 14 19:41:46 2017     Reply to this: 13215
Author: Jamie 
Type: Update 
Category: CDS 
Subject: front-end/DAQ network down for kernel upgrade, and timing errors 

I'm upgrading the linux kernel for all the front ends to one that is supposedly more stable and won't freeze when we unload RTS models (linux-image-3.2.88-csp).  Since it's a different kernel version it requires rebuilds of all kernel-related support stuff (mbuf, symmetricom, mx, open-mx, dolphin) and all the front end models.  All the support stuff has been upgraded, but we're now waiting on the front end rebuilds, which takes a while.

Initial testing indicates that the kernel is more stable; we're mostly able to unload/reload RTS modules without the kernel freezing.  However, the c1iscey host seems to be oddly problematic and has frozen twice so far on module unloads.  None of the other hosts have frozen on unload (yet), though, so still not clear.

We're now seeing some timing errors between the front ends and daqd, resulting in a "0x4000" status message in the 'C1:DAQ-DC0_*_STATUS' channels.  Part of the problem was an issue with the IRIG-B/GPS receiver timing unit, which I'll log in a separate post.  Another part of the problem was a bug in the symmetricom driver, which has been resolved.  That wasn't the whole problem, though, since we're still seeing timing errors.  Working with Jonathan to resolve.

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