pik33 wrote: ↑
Fri Jun 28, 2019 5:19 pm
From my current experience:
- boot time from SD card (Sandisk, 16 GB, A1) ~18 seconds to the desktop
- boot time from Sandisk Ultra USB3 32GB pendrive (via root= in cmdline.txt) ~15 seconds
- SSD not yet tested
- using the case with a slow rotating (powered from 3v3 instead of 5V) 3 cm fan I got slightly higher temperature (~50C) when idle, compared to RPi3B+ (~42C), but slightly lower temperature (60..65 instead of 65..70) while in normal use. This means using RPi4 without active cooling or rather big heatsink is not recommended. It will throttle when loaded, as it does RPi3. There is no need for heatsink if you make even slow air flow around the RPi.
- I made a 4GB reall swap partition on this USB3 pendrive
Back when I first installed SuSE 9.2 on a dual-Opteron system with 2GB of ECC RAM, the install recommend a 1GB swap space. While using it for several years, I don't think it ever used any of that swap space. With a 4GB Pi4B, I seriously doubt swap space is need unless one is doing something that has an excessively large memory footprint. And even then, the swap file probably needn't be very large. I think your 4GB swap file falls into the "overkill" category.