13:29 <wwilly> hi krzk, https://krzk.eu/pub/krzk_testing_setup_-_april_2019.jpg you should tidy up :)

13:30 <wwilly> I'm currious, is you relay switch enough? I'm using a similar setup, with the 16th relay module, 5v 10a, but lastly I found out that some relay are not reliable anymore, voltage drop, causing dcache_parity errors

13:31 <wwilly> since how long you run with that in place?

13:50 <krzk> wwilly: hey! cables are more-or-less organized and on one level with limited space I have trouble to bring it yo a better shape :)

13:51 <krzk> I was thinking about rack tower or some drawer system...

13:51 <krzk> about relay, I was using one 4-channel relay for 3-4 years and recently bought bigger one

13:51 <krzk> but only because of need of bigger (8 CH) because old one was still working fine

13:52 <wwilly> and are you just testing kernel usable sanity of new patches? or proper long run benchmark that exhaust the board?

13:52 <krzk> Are you sure that voltage drops are effect of relay? I had many unknown reboots. I suspected insufficient power but at the end it were screws on relay - not tight enough

13:53 <wwilly> the power supply I use is the same kind as you, but 5v 70a max

13:53 <wwilly> so should far from enough

13:54 <krzk> check voltage drop at the end during load - maybe that's the case?

13:54 <wwilly> I'm working on intensive workload (still working on my phd with the temperature management)

13:54 <krzk> wwilly: I run my test suite but recently slightly trimmed it by removing few stressful patches

13:55 <krzk> It is personal project - no funding from Samsung or Hardkernel at all so I am not that much interested in buying new boards every one year :)

13:55 <wwilly> even without nothing pluged, I've voltage drop, the 5v isn't sustained correctly and flutuate, even without nothing pluged

13:56 <wwilly> krzk, ok :) hope I finish the phd within the scholar year

13:56 <krzk> wwilly: then maybe your power supply is a problem? the voltage drop could be a reason of poor cables or connectors

13:56 <krzk> I have chosen 1mm cables to stay on the safe side :)

13:57 <wwilly> I have bigger cables than this

13:57 <krzk> but even 0.5 mm should be good (you can measure the resistance and expected voltage drop)

13:57 <krzk> bigger than 1? that's a lot of safe margin, I guess

13:58 <wwilly> stollen from the workshop we have in the basement, don't tell that to anybody :)

13:59 <wwilly> when I have fluctuation, I admit that I haven't check if the flutuation appeared on all relays, if so, that should be the power supply I guess

14:00 <wwilly> if not, maybe the relay of that channel is old? I don't know, I'm not an eletronician

14:00 <wwilly> I don't know what could happen if a relay get old...

14:01 <krzk> relay quality might differ - I once bought from AliExpress and 1/8 channels was working

14:01 <krzk> I guess that the relay itself might stop working - get stuck iin connected or disconnected mode

14:01 <krzk> and maybe in worst case be half-open?

14:07 <wwilly> I just check video on youtube, someone explain that even if it's clicking, doesn't mean it's fully working

14:07 <wwilly> I will have to check mine