Hello, We are now able to reproduce the problem faster and easier (using the patched version of szap-s2 and the scripts included in the tar.gz : http://article.gmane.org/gmane.linux.drivers.video-input-infrastructure/17334 and http://cache.gmane.org//gmane/linux/drivers/video-input-infrastructure/17334-001.bin ) 0) su -c "rmmod ngene && modprobe ngene one_adapter=0" 1) ./run_szap-s2_adapter0.sh | grep Delay 2) in parallel to 1) szap-s2 -S 1 -H -c channels_DVB-S2_transponder_switch.conf -a 1 -n 1 -r -Q 7 (better: by adding "-Q" the program is terminated, and all devices are closed after approx. 8 to 9 secs) => while 2) is running 1) will show increased tuning times Delay : 0.541970 Delay : 0.606943 Delay : 1.410069 [ HERE 2) was started ] Delay : 1.369592 Delay : 1.261879 Delay : 1.766680 3) after 2) has terminated simply let 1) continue for 30-40 iterations. you will see .. Delay : 1.845793 Delay : 1.772285 Delay : 2.045703 Delay : 1.817985 Delay : 0.982030 Delay : 1.769856 Delay : 1.769782 Delay : 0.537857 Delay : 21.628382 4) At this point, immediately press Ctrl-C and restart 1) - you will see Delay : 0.577599 Delay : 0.549717 Delay : 0.593816 Delay : 0.593758 Delay : 0.549584 Delay : 0.546012 ==> BAD: Problem seems to happen due to one adapter being opened and closed again ==> GOOD: we are now able to easily and quickly reproduce both problems without Ctrl-C thanks for your help, Andreas Besse Andreas Besse wrote: > Hello, > > we discovered several problems with the ngene based dual DVB cards. The > problems occur with the Digital Devices Cine S2 Dual DVB-S2 device > (Linux4Media cineS2 DVB-S2 Twin Tuner), the clones like Mystique SaTiX > S2 Dual should also be affected. > > We are using the ngene drivers from the linuxtv repository > http://linuxtv.org/hg/v4l-dvb and the firmware version 15 provided by > Digital Devices. > > *Setup* ******************************************* > > OpenSuse Linux 11.0 > Linux anna 2.6.25.20-0.5-pae #1 SMP 2009-08-14 01:48:11 +0200 i686 i686 > i386 GNU/Linux > DVB drivers: http://linuxtv.org/hg/v4l-dvb (ngene) > 2e0444bf93a4 (changeset 14233:2e0444bf93a4, date: Mon Feb 22 10:58:43 > 2010 -0300) > > module loaded with > modprobe ngene one_adapter=0 > > *Usage* ******************************************* > > We slightly modified the latest version of szap-s2 (available from > http://mercurial.intuxication.org/hg/szap-s2/ ); see attached .tar.gz > > tar xvfz modified_szap_s2.tar.gz > > make > > Most importantly, the modified version prints out the total delay in > seconds of main() to allow for easier debugging. > > *Problem A* ******************************************* > > Two running instance of szap-s2 are used: > > a) one for changing channels between "Das Erste" (Astra 19.2E) and > "ZDF" (Astra 19.2E) > > b) the other one for recording from "Das Erste" (or any other channel) > > Result: > > When only a) is running, channel tuning times between the two > different transponders of "Das Erste" and "ZDF" are around 0.5 > secs. This is really good. > > However, when b) is started in parallel, these times increase to 1.5 > to 1.8 seconds. This is not good. > > How to reproduce? > > 1) in one shell, run > > ./run_szap-s2_adapter0.sh | grep Delay > > You will see > > Delay : 0.560508 > Delay : 0.545771 > Delay : 0.609781 > Delay : 0.593796 > Delay : 0.649772 > Delay : 0.614023 > .. > > 2) in parallel in another shell, run > > ./szap-s2 -S 1 -H -c channels_DVB-S2_transponder_switch.conf -a 1 -n 1 -r > > Immediately, you will see in 1) > > Delay : 1.525178 > Delay : 1.781971 > .. > > *Problem B* ******************************************* > > After reproducing Problem A, we terminate process 2) by hitting > Ctrl-C. > > Even then, channel tuning time stay high in process 1), you will still see > > Delay : 1.773303 > Delay : 1.781734 > Delay : 1.749948 > .. > > This is not good. > > *Problem C* ******************************************* > > What is even worse: > > Very often, you will soon run into trouble: After a very iterations, > you will see: > > Delay : 21.616521 > Delay : 21.773475 > Delay : 21.765678 > > This means that tuning was not possible anymore at all. In this > situation, it always helps to re-load the module by runing: > > su -c "rmmod ngene && modprobe ngene one_adapter=0" > > *Problem D* ******************************************* > > When terminating process 1) and immediately restarting it, channel > tuning times - again - stay high. This is not good. > > Often you will also see Problem C then. > > *Problem E* ******************************************* > > Go back to reproducing Problem A (process 1 and 2 are running), and > the continuously start and terminate process 2) by hitting Ctrl-C > again and again. Sooner or later, you will see Problem C occur then. > > *Remark* ******************************************* > > It _seems_ that, after terminating all szap-s2 processes, and waiting 1 > to 2 minutes, and then restarting szap-s2 again, the failures/problems > seem to be gone _without_ reloading the module. > > thanks for your help, > Andreas Besse > > > -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
