Daphne Periodic Freeze Question

Riverstorm

@beastrow said in Daphne Periodic Freeze Question:

Your help has been awesome, thanks! Quick question... I'm able to get to the /boot/config.txt using an FTP program. Will editing it that way and re-saving it essentially be the same as using the sudo nano command?

Yes it would but I would but their's a permissions issue so it wouldn't save. I would defer to the guru's if there's a better way. I do prefer to use WinSCP but their is issues with permissions on certain files. You won't be able to save it most likely. I hope I don't butcher this to badly but I think the sudo is like running it as root so it can write to the system file sort to speak. Without it it will fail when you try to save. Ctrl-X to save, then press y for yes, then press enter to save the file as the same name. You can add the lines anywhere in the config.txt file but be careful you don't duplicate settings or remember to change them all if you do. :)

Finhead

@Riverstorm You can get around that by loging into WinSCP as root. Just setup a root password first and login with that.

Riverstorm

@Finhead said in Daphne Periodic Freeze Question:

@Riverstorm You can get around that by loging into WinSCP as root. Just setup a root password first and login with that.

You're awesome Fin, I've been dropping out to a command prompt. This will save me a bunch of time!

beastrow

Thanks guys... MOST helpful!

So, using another site, I've overclocked to the following:

arm_freq=1350
over_voltage=5
gpu_freq=550

#sdram overclock
sdram_freq=550
sdram_schmoo=0x02000020
over_voltage_sdram_p=6
over_voltage_sdram_i=4
over_voltage_sdram_c=4

It's definitely running better, (or seems to be - have only tested one game so far), but I did, eventually, have the same issue. Possibly the overclock heating up and it throttling down again? If that's the case, I have heat sinks getting here on Wednesday.

caver01

@beastrow A heat sink should really help a lot. I was running into performance issues on my Pi3 (RetroPie setup from 3.6 image) without any overclock tweaking at all. It didn't take much to notice throttling and stuttering on any number of games. However, I also noticed a yellow, then orange, then RED square appearing on the display which indicates the heat issue.

Once I added a heatsink those problems completely disappeared.

Riverstorm

@caver01 said in Daphne Periodic Freeze Question:

@beastrow A heat sink should really help a lot.

Yeah it seems heat is more of an issue with the Pi 3 than it was with the 2. It's like the 3 was pushed to its limits with little overclock headroom, without going to extremes. For quick testing I use that same case Twitch uses in the video with a fan. I think the fan lowered it additional 18 to 20C, big difference. Inside my case I have a heatsink with a fan mounted on it. It's about 10mm's, just a little tiny thing. I would have snatched up a few more off Amazon but don't see them anymore. I also liked those tall copper heatsinks but don't see them either. It seems there's a lot of aluminum now.

That's a good point you might want to watch the upper right corner for colored squares, the red is overheating and the rainbow is signaling a power issue.

Riverstorm

@beastrow said in Daphne Periodic Freeze Question:

Possibly the overclock heating up and it throttling down again? If that's the case, I have heat sinks getting here on Wednesday.

I think 85C is the threshold for auto downclocking but it's adjustable in the config.txt too.

Here's a script I "borrowed" to watch my speed and temps through SSH while playing. :)

#!/bin/bash
cpuSpeed0=$(cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq)
cpuSpeed1=$(($cpuSpeed0/1000))

cpuTemp0=$(cat /sys/class/thermal/thermal_zone0/temp)
cpuTemp1=$(($cpuTemp0/1000))
cpuTemp2=$(($cpuTemp0/100))
cpuTempM=$(($cpuTemp2 % $cpuTemp1))

gpuTemp0=$(/opt/vc/bin/vcgencmd measure_temp)
gpuTemp0=${gpuTemp0//\'/°}
gpuTemp0=${gpuTemp0//temp=/}

echo
echo CPU Speed: $cpuSpeed1" MHz"
echo
echo CPU Temp: $cpuTemp1"."$cpuTempM"°C"
echo GPU Temp: $gpuTemp0

Finhead

@beastrow said in Daphne Periodic Freeze Question:

Thanks guys... MOST helpful!

So, using another site, I've overclocked to the following:

arm_freq=1350
over_voltage=5
gpu_freq=550

#sdram overclock
sdram_freq=550
sdram_schmoo=0x02000020
over_voltage_sdram_p=6
over_voltage_sdram_i=4
over_voltage_sdram_c=4

It's definitely running better, (or seems to be - have only tested one game so far), but I did, eventually, have the same issue. Possibly the overclock heating up and it throttling down again? If that's the case, I have heat sinks getting here on Wednesday.

Not sure why your having the pause issue. I don't have mine overclocked at all and have no issues with the 3 roms I use DL, DL2 and SA. What is the rating on your powersupply? I know from reading the Pi3 is power hungry and needs a full 2.5 amps to run properly.

caver01

@beastrow I haven't had to do any of those temp+performance tweaks. The Pi3 has been fast enough using stock settings in RetroPie 3.6 image without any any slowdown in Daphne at all. Arcade games that were previously choppy on older Pi hardware also run well (games like Golden Tee 2k, Mortal Kombat 2,3 etc.), and many of them are now running the CRT-PI shader with scanlines and curvature.

Regarding the heat sink, @Riverstorm a tiny fan is great, but how are you holding it on? The Pi3 doesn't have a good spot to clamp stuff down. For my sink, I had a big square of aluminum fingers-style from an ancient CPU (maybe an old Pentium?) laying around, so I just cut a piece to size and cleaned it very smooth using 600 grit sandpaper on glass. My sink isn't even very high--maybe a 3/8". Then, a dab of ArcticSilver thermal compound to hold it and get good heat transfer and that's it. I really don't think it takes much. I haven't had a single heat issue since doing this.

Finhead

@caver01 I see you directed that at me? "Regarding the heat sink, @Finhead a tiny fan is great, "

I don't run any kind of heatsink or fan on my RPi3 so I'm not sure why you tagged me, I have zero issues stock no overclock no fan no heatsink.

caver01

@Finhead Sorry. Meant to mention @Riverstorm

Riverstorm

@caver01 said in Daphne Periodic Freeze Question:

Regarding the heat sink, @Finhead a tiny fan is great, but how are you holding it on?

Caver is the AS5 itself creating "suction" to hold it in place?

I tried lapping heatsinks (regular computer) but find the work/gain ratio pretty low. My brother does auto-body work on the side so I can get a hold of some pretty high grit sand paper and the final lap was all wet sanding. Looked almost like a mirror but the temp gain was only a degree or two. I find making sure the spring loaded screws providing "even" pressure turned out to be more important. Push/pull fan config. was the same it's a degree or two but hey each degree counts when you're tweaking. :)

This is what I am using but no longer available. I liked these little guys.

Raspberry Pi copper heatsink with fan

Finhead

@Riverstorm
Google search brings these up, pretty high price for few degs

caver01

Yeah, you use very little thermal paste and it sticks fine, but I'd feel better if I had a way to keep it secure since my PI mounts upside down in my cabinet. So far it hasn't moved, but it could. According to the manufacturer, the compound changes over time, which I seem to recall means that it hardens somewhat, but it's never going to be like glue.

Looks like your little fan/sink is stuck on with a self adhesive tape. Maybe that works better. I think it probably sticks better, but may not transfer heat as well. I'd like to rig up a gizmo to secure it--maybe something with zip ties. I hate to spend more $ on it. The only reason I was sanding was because I was reusing part of an old sink. I had to completely clean it of old , crusty compound. Flatter is better, but the compound helps fill in microscopic gaps.

I really wish my Pi3 wasn't running hot. I have read reports that some do, some don't.

Riverstorm

@Finhead said in Daphne Periodic Freeze Question:

@Riverstorm
Google search brings these up, pretty high price for few degs

Ouch, yeah at that price point it's hard to justify. They know they have a decent product. They are as bad as pay day lenders interest rates. The cost is almost 72% of the whole Pi! I appreciate the link. I had no idea they were still available.

Finhead

@caver01 said in Daphne Periodic Freeze Question:

Yeah, you use very little thermal paste and it sticks fine, but I'd feel better if I had a way to keep it secure since my PI mounts upside down in my cabinet. So far it hasn't moved, but it could. According to the manufacturer, the compound changes over time, which I seem to recall means that it hardens somewhat, but it's never going to be like glue.

Looks like your little fan/sink is stuck on with a self adhesive tape. Maybe that works better. I think it probably sticks better, but may not transfer heat as well. I'd like to rig up a gizmo to secure it--maybe something with zip ties. I hate to spend more $ on it. The only reason I was sanding was because I was reusing part of an old sink. I had to completely clean it of old , crusty compound. Flatter is better, but the compound helps fill in microscopic gaps.

I really wish my Pi3 wasn't running hot. I have read reports that some do, some don't.

I was going to use some of this for a heatsink if I had issues with heat, so far I haven't.

beastrow

I ordered Arctic Silver thermal adhesive to go with my heat sinks. Don't have experience with them in terms of products that hold the heat sink on by themselves, but I've had good PC CPU experience with Arctic Silver as a company.

@Finhead - My Power supply is Canakit 2.5A Micro USB Power Supply. I ordered the Pi 3 on Amazon and the deal I got came with the supply. I've now overclocked the board AND the mini SD port. Things are definitely running better, but I still got the freezes, (just a little further in).

I'm starting to think it could very well be the memory card. It's rated acceptably in terms of specs, but is on the generic side. Makes me wonder if it has speed issues.

Finhead

@beastrow Could be. This is the card I switched to, Samsung Evo Pro very happy with it.

caver01

Someone with experience probably should weigh-in on this this, but there is definitely a difference between thermal compound and thermal adhesive. The adhesives are permanent, usually 2-part products like epoxy. If you go to Acrtic Silver website, they don't recommend the adhesives for CPUs. They recommend compounds. @Finhead 's link above is to a product that has an ambiguous name. Is it Arctic Silver, or is it Arctic Alumina? They have Arctic Silver Compound, Arctic Silver Thermal Adhesive, and Alumina Thermal Adhesive, but not Arctic Silver Alumina Thermal Adhesive.

Anyway, the Alumina appears to be recommended for CPU, but not their Arctic Silver Thermal Adhesive. I am probably splitting hairs. Maybe it doesn't really matter in the end and either product will conduct heat to the sink properly.

Riverstorm

@beastrow said in Daphne Periodic Freeze Question:

I'm starting to think it could very well be the memory card. It's rated acceptably in terms of specs, but is on the generic side. Makes me wonder if it has speed issues.

Did you try and set the governor to "performance" at least for testing?

I know there's a lot of cards that work well that people could share. I've had good luck with SanDisk Ultra, Ultra PLUS, and Extreme PLUS.

Is the adhesive removable and expoy permanent? I prefer something that's not permanent if possible as I like to reuse the heatsinks and then pass the old Pi's along to whoever wants them. I usually order 3 or 4 from each gen.

Caver that's funny. I can appreciate splitting hairs. I do it all the time when it's probably unnecessary but I can't help it and sometimes it makes for some interesting and educational conversation. I try to embrace my "faults", as well as, my strengths. Now those programmers, they are a different breed that have to think very logical and methodical which spills over into real life! ;)