Questions tagged [performance]

Questions about software, hardware or network performance. Please use as a supplement for other, more specific tags.

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performance problem on download with vlan and bridge

I have a weird performance problem with a Rpi with Raspbian 11: when I take a speedtest with Ookla CLI I obtain download speed no better than 30Mbs but upload speed over 60Mbs and I know it's not a ...
Grabbi's user avatar
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RaspiOS 64 bit running much slower than 32 bit

I have two RPi 4's running Bitcoin Core v25.0. One is 32-bit RPiOS and the other is 64-bit. 32-bit / 64-bit ARM versions of Bitcoin Core are installed respectively. Both computers are fitted with the ...
pinhead's user avatar
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1 answer
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Raspberry Pi 3 has only 128MB memory available at OS level

I don't know why but my Raspbian installation say me that the Total RAM is 128MB instead of near to 1024MB. total used free shared Mem: 116672 kB 54912 kB 26292 kB 192 kB Swap: 102396 kb 98160 kB ...
riofly's user avatar
  • 143
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252 views

Using DMA for efficient memory copying

Some background info about my problem: I have an external device that is constantly giving me data through SPI I handle SPI reads with DMA from userspace, as kernel based solutions (already ...
PookyFan's user avatar
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1 vote
2 answers
117 views

Why 10% CPU when sleep() on Pi 1B

I'm writing a simple application in C to handle switching relays on an old Pi 1B. When the Pi is supposed to wait for the next action to handle, I use the sleep() system call. I checked with top, only ...
D.Bugger's user avatar
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3 votes
0 answers
194 views

How can I reduce the memory usage of my python3 scripts on a Raspberry Pi Zero 2? [closed]

I created 9 python scripts that I run as cron jobs. When I run them on a VirtualBox virtual machine running Ubuntu Server 20.04 with 512MB of RAM with a single processor, everything runs smoothly and ...
Serge Charbonneau's user avatar
1 vote
1 answer
564 views

Benchmarking performance RPi vs Old Laptop

with the current shortage in RPi availability, I found myself looking for good deals of second hand computers. Basically, I only want the RPi to perform computation and act as a server, nothing more, ...
Myoch's user avatar
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Port forward fails on high data traffic, how can I fix it?

I wanted to test the bandwidth over port forwarding via iperf: On the first terminal: ssh myraspberry -R 5001:localhost:5001 -L 5002:localhost:5001 On the second terminal: iperf -s On the third ...
ceremcem's user avatar
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1 vote
1 answer
651 views

Performance of Minecraft Server on rPi 400

I want to create a Minecraft server at home, and have two spare machines that are candidates for this: A power hungry Xeon WS-2140B A power-sipping rPi 400 I like the low power-usage of the rPi, but ...
Bram's user avatar
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310 views

Windows 10 -> Raspberry PI 4 Samba Share Speed extremely slow unless pause and resume

I've been trying to set up my Raspberry PI 4 as a home media server and was planning to use Samba to transfer files from my Windows 10 PC to the Raspberry PI. Currently, I get speeds of <5 MB/s ...
schu's user avatar
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1 answer
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bluetoothd CPU usage constant at 100 %

I've had this problem for a few months where the Pi 4 gets very hot to the touch, and it invariably turns out that bluetoothd is stuck at 100 % CPU usage, saturating one core. Currently htop tells me ...
Andreas's user avatar
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30 views

5-second increment pauses on Pi Zero W

I've recently set up a Pi Zero W with the as-of-writing most recent Pi OS Lite image. It is connected to my home network via Ethernet and has Pi-hole installed on it. I found that during setup and, ...
Nightfirecat's user avatar
0 votes
1 answer
387 views

Performance of Raspberry Pi 4B Bullseye VNC headless

I have headless Raspberry Pi 4B 4GB Bullseye connected over USB-C to iPad Pro and I am using VNC to connect to it directly over a USB-C cable which also powers it. I have increased GPU memory to 256 ...
Ragnar's user avatar
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Why Raspberry Pi 4b is slower when boot up from USB flash drive than boot up from microSD card?

Providing that what I've read in this article is true I'm wondering why it's faster to run Raspberry Pi 4b from microSD, than it is to run it from a decent speed (200MB/s read) USB Flash Drive? Is the ...
michal roesler's user avatar
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1k views

SD card speed (IOPS) is awful

For a long time, I'm noticing that my Raspberry Pi 4 is slow in some scenarios, especially when some disk-consuming operations are running. For example, docker pull something might take around 5-10 ...
ihorc's user avatar
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1 vote
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300 views

VNC poor performance on PI4 8GB Bullseye 64bit

I've a PI4 8gb model with a fresh install of Bullseye 64bit and Im getting really poor VNC performance over 2.4ghz wifi network, both devices the client (a mac book pro i9 w/64gb ram) and the server (...
bmaggi's user avatar
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1 vote
3 answers
2k views

My RPi2 became very slow suddenly

I am running Raspbian on my RPi2 and on top of that a Node.js server. This morning the Node.js server went down, but I still have access to the SSH terminal. I ran top but couldn't see any processes ...
Ionică Bizău's user avatar
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125 views

Run Blynk server, Mosquitto and Node-Red on RasPi Zero?

Never used a pi before so I'm not sure how powerful they are/how much can they run at the same time. (Yes, I obviously know that it depends on what you're running). I was wondering, is there a good ...
Randomaker's user avatar
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717 views

OpenCV image processing incredibly slow on Pi 3B+

I have a computer vision algorithm on my Pi 3B+ that uses the following function, myVision(), that takes in a frame and outputs the pixel coordinates of a certain colored dot (tuned according to the ...
kieransquared's user avatar
1 vote
1 answer
1k views

RPi 4B 4GB: Excessive Shut Down time using the GUI shutdown

I have 5 - 4B-4GB's and 1-8GB systems. One of the 4GB systems is experiencing an excessive shutdown (power off) time of 4.5 minutes. All the other systems take about 15-20 seconds, all my systems ...
Korbendallaz's user avatar
1 vote
2 answers
7k views

Raspberry Pi 3 B insanely slow on basically all tasks

My Raspberry Pi 3 B is only connected via Ethernet to the network and running a couple of server tasks, among them an HTML web server (nginx PostgreSQL Typo3). This was working perfectly fine for ...
kleines Filmröllchen's user avatar
2 votes
0 answers
101 views

Overclocking Raspberry Pi after the device has booted

I using a Raspberry-Pi 3B+ device and I am trying to change the maximum frequency after the device has booted. From my understanding, this can be done by editing the files under /sys/devices/system/...
noobcoder's user avatar
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1 answer
501 views

Writing to a NAS from a Raspberry Pi 2B - SMB or NFS?

I'm familiar with Windows but a Linux newbie. I have a Synology NAS which I want to use with my Raspberry Pi 2B (which is running Tvheadend). The NAS supports NFS, SMB and AFP. I want to minimise ...
serialhobbyist's user avatar
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0 answers
71 views

Performance and Media player OS for old Pi model B

I want to replace my old OSes (RaspBMC and Libreelec8) for Raspberry pi B by a more modern distribution but I also I want to ensure that the performance is not much worse. As modern distributions ...
Daniel Perez's user avatar
3 votes
1 answer
1k views

Can I record HD 1080 p 60 fps through USB on a Raspberry Pi 3 or 4?

I have a set-top box with HDMI output and want to record some programs from it on a Raspberry Pi (model 3 or 4). I found some HDMI to USB 3.0 converters with HDMI 'loop-out' which would enable us to ...
HarryH's user avatar
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1 answer
1k views

Slow Pi (running pihole) due to large MicroSD with only one partition?

My piholePi seems somewhat slow. It is a Raspberry Pi 2 Model B Rev 1.1, so 4 cores @ 900 mhz. Runs Pi OS Buster Running the Pi OS Lite version Here is the general load, of top -d 10 Sometimes, ...
TheGlasses's user avatar
1 vote
2 answers
1k views

Differences between B0 and C0 steppings of the BCM2711

I just acquired a Raspberry Pi 4 Model B with 4GB RAM. The processor stepping (revision) is B0 (the heat spreader says 2711ZPKFSB06B0T). It seems to be stable at 2.0 GHz with over_voltage=6; it'll ...
bwDraco's user avatar
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1 vote
1 answer
87 views

How to get more samples from ADC converter using SPI

I am trying to use ADC converter in my raspberry which has speed around 100k smp/s. I am setting clock as producent of converter recomend for 20 Mhz. But I only recive around ~ 43k samples/s and I can'...
Johny_Puszka's user avatar
1 vote
2 answers
4k views

Max networking performance with RPi 4 (Gigabit ethernet), with/without a USB3 external disk connected

I want to use my RPi4 as a small home NAS. To do that, I'm trying to benchmark the maximum file transfer performance. Workflow: Rpi4 connected to home router with a 1 Gbit cable computer connected ...
Basj's user avatar
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0 answers
435 views

Samsung 64GB EVO Select U1 Failing SD Card Speed Test

I have a 64 GB EVO Select U1 SD Card (link). I ran the Raspberry Pi Diagnostics SD Card Speed test on it. The card always fails the random write test by a large margin (the target speed for this test ...
plafratt's user avatar
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3 votes
2 answers
4k views

sudo apt-get upgrade is extremely slow

I run a new installation of Minimal image based on Debian Buster on Raspberry Pi 3B. sudo apt-get update gone as usuall - 1-2 minutes. However, sudo apt-get upgrade is running already 1:30 or so. And ...
Roman Matveev's user avatar
2 votes
1 answer
174 views

How many parallel server applications are too much?

I am curious what general recommendations are. I would like to set up the following application, ideally on one device (RPi4, 4GB): InfluxDB and Grafana PiHole PiVPN and SSH nginx (simple) ...
Markus's user avatar
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2 votes
1 answer
255 views

Comparison between Object Detection Solutions on Raspberry PI

I have only little experience with embedded systems. I have a Raspberry Pi 4 with 1gb RAM and a Camera Module v2.1 and want to do object detection and tracking on it. By best solution I mean a ...
Karl's user avatar
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0 votes
1 answer
759 views

Is it possible to use PAPI on a Raspberry Pi 4B with raspbian buster?

I want to use the PAPI library to record hardware performance counters during benchmarks, but it does not seem to work on my Raspberry Pi 4 B. Installing PAPI was not a problem, but there are no ...
Vetii's user avatar
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0 votes
1 answer
4k views

Improving web browsing performance on the Raspberry Pi 3

Web browsing on the raspberry pi 3 has become rather dreadful with a later version of raspbian. I am running raspbian on a Samsung EVO+ (which is supposedly faster than most SD cards..). I don't ...
9a3eedi's user avatar
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5 votes
1 answer
303 views

How is CPU in Raspberry Pi 4 +36% faster than for Raspberry Pi 3?

CPU benchmarks show that the Raspberry Pi 4 outperforms Raspberry Pi 3 by +36% https://www.geeks3d.com/20190930/raspberry-pi-4-vs-raspberry-pi-3-cpu-and-gpu-benchmarks/ How is this possible given the ...
Ramces Gonzalez's user avatar
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0 answers
55 views

Network speed problem on Raspberry Pi 3

Both my desktop (running Windows Subsystem for Linux) and raspberry pi 3 connect to router via WiFi. Download speed from internet on desktop is decent : ~/tmp$ wget https://cdimage.debian.org/debian-...
Philippe's user avatar
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1 vote
1 answer
2k views

Does this flat heat sink even work for cooling?

I bought a raspberry pi 4 case, and it came with these heat sinks you see in the picture + a fan. From the sizes, I guess the flat heat sink is for the CPU. I kind of find it hard to believe that this ...
The Quantum Physicist's user avatar
1 vote
0 answers
85 views

How to power RPi with fan from single source?

Electronics beginner here. I have Raspberry Pi 4 GB variant. I have the following power requirements: power a 5V cooling fan 12V cooling fan (a spare cooler master)thanks @Milliways safely (i.e. ...
RinkyPinku's user avatar
3 votes
1 answer
2k views

External SSD-Drive very slow when using mounted encrypted container

I have a Raspberry Pi4 (4GB) with a 250GB SSD connected via USB3. The SSD has a write speed of about 70MB/s, which is very nice. The SSD is mounted via fstab and the following settings: LABEL=DATA /...
Florian's user avatar
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1 vote
0 answers
850 views

UV4L huge CPU load on streaming audio

I'm building a little baby monitor using RaspberryPi ZeroW and UV4L and run into a little problem. I'm using WebRTC to cast video and audio to my browser from RPI camera (used facedetect demo, ...
user2872173's user avatar
0 votes
1 answer
1k views

Raspberry Pi 4 Low Voltage performance

I am looking what exactly happens when a Raspberry Pi 4 is powered with low voltage. I am not looking whether this will hurt the Raspberry (as this has been asked before) or how to fix this. I ...
Ole Albers's user avatar
1 vote
1 answer
103 views

Raspberry pi 3 A+ [closed]

The Raspberry Pi 3 A+ ,I think is memory-constrained,in that Chromium does not work well. I wanted to code Scratch 3 on it as Scratch 2 is only available offline. Using the web seems off limits and so ...
Bluelion7's user avatar
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1 vote
0 answers
550 views

Why does Pi 3 have better WebGL than Pi 4?

Based on https://webglsamples.org/fishtank/fishtank.html Pi 3B, Raspbian Buster, GL driver on, Chromium reports 18 FPS. Pi 4B4, Raspbian Buster, GL driver on, Chromium reports 12 FPS. Any idea why ...
Botspot's user avatar
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0 votes
0 answers
365 views

Raspberry pi 3 B+ Disk IO Bottleneck

I have a RP3 with several docker containers (11) running at home, some for network purposes, other for IoT. The thing is, I've notice several issues related to disk IO, specially when performing unzip ...
jtomasrl's user avatar
  • 113
4 votes
4 answers
4k views

Performance of Raspberry Pi 4 in luks?

I found previous version was quite slow (3MB/s), but this newer Pi has more power. What speeds can I expect with external hdd and standard installation of luks (I believe aes 256, xts, plain 64)?
menfon's user avatar
  • 149
1 vote
1 answer
142 views

How many blocks can a RPi 2B load per day as a Bitcoin full node?

My Raspi 2B is running a full node over a >20MBit/s internet provider (I subtracted another) and it seems that it only loads about 6 blocks a day which would amount to about 1GB per day. Is it ...
bomben's user avatar
  • 309
6 votes
3 answers
6k views

What sort of throughput is achievabe over the USB 3.0 port on the Pi-4?

Looking to run a router application on the rPi-4, and was wondering if anyone has experience using usb 3.0 -> gigabit ethernet adapters on it - specifically what adapter/chipset worked with what ...
user2813274's user avatar
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1 vote
1 answer
661 views

Unusably slow performance on Model B Revision 2.0 using latest Raspbian kernel - advice?

I finally decided to try out a RBP that was given to me years ago. It's a Pi 1 Model B Revision 2.0 (PCB 2011.12). I installed and set up the latest Raspian kernel using NOOBS, no problem. However, ...
devoidzer0's user avatar
3 votes
2 answers
1k views

Cost-effectiveness of Pi cluster

Does it make sense to use Pi cluster for real computation? My use case is to carry out intensive computation tasks 24/7. The tasks are pleasantly parallel, and there will be minimum inter-node ...
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