[mythtv-users] the lost minute

Claude Gélinas agr. claude at phyto.qc.ca
Sat Apr 14 21:52:27 UTC 2007


Le samedi 14 avril 2007 à 13:36 -0700, Romain Kang a écrit :
> My mythbox lost time (about 2.5 sec/minute) when I went to ivtv-0.10.
> I reported this issue the ivtv-devel list.  I never got any kind of
> acknowledgement or request for more information, but I managed to
> workaround by turning off closed captioning in mythtvsetup:
> 
> General -> Global Backend Setup -> VBI format: None
> 
> Regarding NTP, the standard daemon from UDel cannot compensate if
> the system is drifting by more than +/- 500 parts per million, and
> 2.5 secs/minute is about 42,000 ppm.  
> 
> Interesting /var/log/messages entries included:
> 
> Mar  3 21:27:45 nero kernel: warning: many lost ticks.
> Mar  3 21:27:45 nero kernel: Your time source seems to be instable or some driver is hogging interupts
> Mar  3 21:27:45 nero kernel: rip __do_softirq+0x53/0xd5
> 
> Mar  3 22:36:25 nero kernel: ivtv1 warning: CX2341X_ENC_SET_VBI_LINE took 411 jiffies (1000 per HZ)
> 
> I conjecture this could result from funny interaction between ivtv
> and a single CPU system running with an SMP kernel.  (My mythbox
> is running amd64 3000+ and the x86_64 kernels from Fedora Core are
> all SMP).  However, I haven't had the opportunity to test the
> hypothesis.

I'm running FC6 on AMD Athlon(tm) 64 Processor 3200+ freshly compile
kernel
2.6.20.4 #1 SMP (not a fedora kernel)
and compiled IVTV-0.10.1

My problem seems to have started when I upgrade to ivtv 0.10.0.

I'll try to change VBI setting to see if it can help and also to update
ivtv to the latest 

Thanks
-- 
-----
Claude Gélinas agr., dta
Phyto Ressources inc.
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