Questions tagged [performance]

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

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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 ...
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 ...
0 votes
0 answers
26 views

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 ...
1 vote
1 answer
148 views

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 ...
0 votes
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, ...
3 votes
2 answers
2k views

Raspberry PI 3 - Browser, bad performance (Website with HTML5 canvas)

Abandoned post by Unregistered user. I have encountered a problem while developing a dashboard which is supposed to run on a Raspberry Pi 3. It is a combination of a HTML5 canvas as background to ...
1 vote
0 answers
147 views

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 ...
0 votes
1 answer
141 views

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 ...
3 votes
1 answer
1k views

Execution time performance when counting up to 1,000,000,000

I have made a simple C++ program that simply counts up a variable to 1,000,000,000 and then displays the time it took. I used a simple for loop to do this. for(long n=0;n<1000000000;n++); The ...
0 votes
0 answers
250 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 ...
3 votes
2 answers
6k views

Does being undervoltage decreases the Pi's performance?

I recently blew up the 5V 2A PSU that came with my Pi. Since then, I am using my phone's charger, 5v 1A to run my Pi. And while it runs fine most of the time, I see the undervoltage warning, while it ...
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 ...
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 ...
18 votes
7 answers
61k views

How to change the default governor?

I want to change the default governor on my pi from ondemand to performance. Is there a way of doing this?
1 vote
1 answer
558 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, ...
1 vote
1 answer
645 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 ...
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 ...
1 vote
0 answers
30 views

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 ...
1 vote
0 answers
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 ...
12 votes
3 answers
8k views

Lxpanel using 100% CPU (1 core)

On my Raspbian 2018-11-13 installation with all updates (sudo apt-get update and sudo apt-get upgrade), I see the CPU graph in the task bar (top right corner) at constant 25%. I opened a terminal and ...
65 votes
6 answers
132k views

How do I determine the current MHz?

I've been trying to get an accurate reading of my Raspberry Pi's MHz, since I overclocked it in /boot/config.txt My /boot/config.txt is as following: pi@raspbmc:~$ cat /boot/config.txt arm_freq=900 ...
0 votes
0 answers
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, ...
23 votes
6 answers
86k views

How can I stress test my Raspberry Pi

I recently picked up a battery powered USB cell phone charger and I'm running some tests to see what kind of battery life I will get. Right now I'm just testing at Idle. I want to also run a test ...
-1 votes
1 answer
110 views

Is a Raspberry Pi 3 B+ "usable" enough for our coding/development, entertainment, gaming needs?

I'm planning on buying 2 units. One for myself for the purposes of learning web development, and one for my sister for entertainment purposes. I know that the latest iteration of the device will ...
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 ...
1 vote
0 answers
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 ...
2 votes
2 answers
2k views

Performance with an encrypted disk

Is Raspberry Pi (model B, rev. 2) suitable for a home file server with external disks encrypted with LUKS? In particular, is the de/encryption throughput reasonable? I used to have such a disk in a ...
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)?
1 vote
0 answers
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 (...
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 ...
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 ...
27 votes
5 answers
34k views

Why is my SD card slow?

My SD card seems to be running slow. I have an ADATA 16 GB SDHC Class 10 card. I checked the compatibility list which lists a card with similar specifications, and it states that it is "working". Even ...
0 votes
1 answer
757 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 ...
3 votes
1 answer
262 views

Transputer Emulation

Given that next year is the 30th anniversary of the Inmos Transputer, I'd like to try to set up a sort of emulation of the distributed architecture using the RPi. Although I'm only at the planning ...
0 votes
0 answers
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 ...
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'...
0 votes
0 answers
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 ...
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 ...
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 ...
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/...
0 votes
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 ...
0 votes
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 ...
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 ...
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 ...
-1 votes
1 answer
1k views

Raspberry Pi 3 Model B+ vs Odroid C2 huge performance difference

So i benchmarked my Raspi 3 B+ and an Odroid C2 with sysbench by in single and multithread operation by using sysbench --test=cpu --cpu-max-prime=20000 --num-threads=4 run The results are kinda ...
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 ...
2 votes
1 answer
8k views

Pi 3 overall slow performance [closed]

I recently bought my first Pi 3 Model B with a 32GB SD Card. I find overall it is very slow. My Atom (Android) is much faster compared to a Pi. Do I need to do something for the Pi to perform better? ...
0 votes
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 ...
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 ...
3 votes
3 answers
6k views

Optimising raspbian performance for python script

(I know this is probably the most overkilled question but) I've designed a pretty heavy code/script in python, which yes would have been better implemented in c, but in saying that short of over ...

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