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by ejolson
Sat Aug 24, 2019 10:54 pm
Forum: Off topic discussion
Topic: Wishful thinking for an additional product
Replies: 12
Views: 263

Re: Wishful thinking for an additional product

While the RPF case is "ergonomically pleasing" I do tend to shy away from those due to lack of ventilation ports. Even though official ventilation holes were discussed at length here when the Pi 3B+ came out, the case for the 4B allows for even less ventilation. The advantage of such a case is that...
by ejolson
Sat Aug 24, 2019 8:22 pm
Forum: General programming discussion
Topic: Liberation through Computer Literacy
Replies: 1095
Views: 41457

Re: Liberation through Computer Literacy

Kira says that tea and coffee is overrated and that pre-lactarinism is the one true way so that he can drink the milk before it is tainted by anything afterwards (and it had better be lactose free). I've never heard of lactose-free pre-lactarianism. The lead developer of FidoBasic prefers the biscu...
by ejolson
Sat Aug 24, 2019 8:14 pm
Forum: Troubleshooting
Topic: Raspberry Pi 4 Ethernet Port Issue
Replies: 3
Views: 140

Re: Raspberry Pi 4 Ethernet Port Issue

What model switch is it? There has been some negotiation issues with a D-Link DGS-108 that are worked around in a kernel patch. Along a similar line, I just discovered my Pi 4 won't connect with the gigabit switch here. I've done "apt-get update; apt-get upgrade" and the problem still persists. Sin...
by ejolson
Sat Aug 24, 2019 6:28 pm
Forum: General discussion
Topic: Raspberry Pi 4 usb boot?
Replies: 221
Views: 31319

Re: Raspberry Pi 4 usb boot?

In the classroom environment, we found the microSD cards to be problematic. No issues with reliability or performance, but they are so small that pilfering is potentially an issue, made worse by the fact that pupils often have smartphones which could use some extra storage--and a microSD card was p...
by ejolson
Sat Aug 24, 2019 6:19 pm
Forum: General discussion
Topic: Raspberry Pi 4 usb boot?
Replies: 221
Views: 31319

Re: Raspberry Pi 4 usb boot?

The other thing I don't get, is why those complaining are 1. so vocal, 2. so insistent (to the point of getting themselves banned) in their argument, 3. so unwilling to learn. As the person who could best answer those questions has been temporarily banned , I'll do my best to present the other side...
by ejolson
Sat Aug 24, 2019 4:54 pm
Forum: Troubleshooting
Topic: RPI 4 - broken twice
Replies: 11
Views: 308

Re: RPI 4 - broken twice

The SoC (main chip) needs are flow over it, not just a heightened air pressure over it, so where can the air blown into the case escape, to create a flow of air? In other words, where did you drill the holes that allow the air to escape? Without those you won't get much cooling! Would the perfect p...
by ejolson
Sat Aug 24, 2019 4:17 pm
Forum: Troubleshooting
Topic: Raspberry Pi 4 Ethernet Port Issue
Replies: 3
Views: 140

Re: Raspberry Pi 4 Ethernet Port Issue

What model switch is it? There has been some negotiation issues with a D-Link DGS-108 that are worked around in a kernel patch. Along a similar line, I just discovered my Pi 4 won't connect with the gigabit switch here. I've done "apt-get update; apt-get upgrade" and the problem still persists. Sin...
by ejolson
Sat Aug 24, 2019 3:54 pm
Forum: Troubleshooting
Topic: RPI 4 - broken twice
Replies: 11
Views: 308

Re: RPI 4 - broken twice

Have you tested the drive/usb adapter performance? I've tested adapters that appear to work at first but eventually hang. There should be some indication of this in the logs though. The best test I've found to cause a failure is bonnie++. The "rewriting" phase of the benchmark breaks bad controller...
by ejolson
Sat Aug 24, 2019 4:24 am
Forum: General programming discussion
Topic: Liberation through Computer Literacy
Replies: 1095
Views: 41457

Re: Liberation through Computer Literacy

It's a bit slower (6.8s vs 4s) on my PC but at least the RPi can comfortably run it, it only uses up 166 MB. My RPi3 does it in 24.6s, though half that time is spent in the GC. It appears liberating after all for a Raspberry Pi owner to be literate in reading and writing Haskell programs. Running o...
by ejolson
Fri Aug 23, 2019 4:35 pm
Forum: Off topic discussion
Topic: Best Raspberry Pi Alternatives 2019
Replies: 32
Views: 851

Re: Best Raspberry Pi Alternatives 2019

> how successful it's been in introducing youngsters to computing? My take: there is no one thing that magically makes many people interested in computing who didn't already have some interest. For those who are interested (of any age) the R-Pi is a great choice, and an unusually good value. My wif...
by ejolson
Fri Aug 23, 2019 3:43 pm
Forum: General discussion
Topic: RasPi 4 is on RDP slower than the RasPi 3
Replies: 4
Views: 170

Re: RasPi 4 is on RDP slower than the RasPi 3

insidERR wrote:
Fri Aug 23, 2019 10:31 am
My assumption is that the operating system (Buster) has to do with it.
Buster is an interesting theory. I would have suspected the vc6 video.

Have you tried pulling the SD card out of the Pi 4 and placing it in a Pi 3 to check? It should just work.
by ejolson
Fri Aug 23, 2019 3:08 pm
Forum: General discussion
Topic: Why moving to 64bit?
Replies: 203
Views: 9787

Re: Why moving to 64bit?

time dd if=/dev/zero bs=1M count=4096 status=progress | ssh localhost 'cat > /dev/zero' Pi4B 32: 52.9 MB/s 64: 51.9 MB/s Pi3B+ 32: 27.0 MB/s 64: 27.4 MB/s Note: ssh uses by default chacha20-poly1305, as can be seen by ssh -v localhost Thanks for the chacha20 timings. Does SSH use compression before...
by ejolson
Fri Aug 23, 2019 2:55 pm
Forum: Staffroom, classroom and projects
Topic: School timetabling with Pi. Benchmark Pi vs x86
Replies: 15
Views: 3684

Re: School timetabling with Pi. Benchmark Pi vs x86

Old topic, but i think still not out of date; because schools still need to do their timetables. I also done the benchmark with a 3+ some time ago and also with a Pi 4 today. Results: 4min 36s - Broadcom BCM2711, Raspberry Pi 4, ARM Cortex-A72, 1.5 GHz, Raspbian, Volker Dirr 7min 45s - Broadcom BCM...
by ejolson
Fri Aug 23, 2019 2:02 pm
Forum: General discussion
Topic: Why moving to 64bit?
Replies: 203
Views: 9787

Re: Why moving to 64bit?

While I'm not an expert, it is notable that wireguard --the fast, modern, secure VPN tunnel--avoids AES entirely. Wireguard instead employs chacha20 from the danceable-name family of cyphers. Not an expert either but i'm sceptical if this is as secure as they say. Curve 25519 is proven secure and t...
by ejolson
Fri Aug 23, 2019 5:44 am
Forum: General discussion
Topic: Why moving to 64bit?
Replies: 203
Views: 9787

Re: Why moving to 64bit?

Funny how such intricate consequences ultimately stemmed from the decision not to put ARMv8 cryptographic extensions in the Pi 4. By now some might suspect AES is not a convenient cypher for streaming data across the world wide web. Fortunately most uses of https are not cryptographic confidentiali...
by ejolson
Thu Aug 22, 2019 5:56 pm
Forum: Off topic discussion
Topic: double cpu's
Replies: 15
Views: 975

Re: double cpu's

Separate question on clusters; Given that some of us have a mixture of Pies, should the most or least "powerful" of them be used as the master ? e.g. Pi 4 with 4 Gig RAM at 1500MHz or Pi 3 with 1 Gig RAM at 1200MHz ? If the master will also provide a shared filesystem for the cluster, then use the ...
by ejolson
Thu Aug 22, 2019 4:49 pm
Forum: Gentoo
Topic: Bootable 64-bit Gentoo image for the RPi4 released (Xfce4 desktop)
Replies: 18
Views: 1276

Re: Bootable 64-bit Gentoo image for the RPi4 released (Xfce4 desktop)

If you have an RPi4 , and would like to try running under it under a 64-bit (kernel+userland) OS (whether for comparative benchmarking, access to aarch64-only packages, or just out of curiosity), you might like to check out my recently released gentoo-on-rpi-64bit bootable image (downloadable from ...
by ejolson
Thu Aug 22, 2019 3:05 pm
Forum: General programming discussion
Topic: Liberation through Computer Literacy
Replies: 1095
Views: 41457

Re: Liberation through Computer Literacy

At least one of the Python 3 versions uses a completely different optimized library based on the installed Python version. Buster on a Raspberry Pi 4 uses the faster library; maybe the Gentoo version doesn't. So far the prebuilt Gentoo image appears complete, functional and crash free. That is a go...
by ejolson
Thu Aug 22, 2019 2:38 pm
Forum: General discussion
Topic: Raspberry Pi 4 usb boot?
Replies: 221
Views: 31319

Re: Raspberry Pi 4 usb boot?

I just want to boot from USB, on the RPi4, just like I do on my RPi3B/B+/A+, or are you too thick to understand that! 8-) I think everyone commenting on the thread understands that. However, you are not the only one who wants the feature and not everyone else who wants it is willing to just set a P...
by ejolson
Thu Aug 22, 2019 4:46 am
Forum: General discussion
Topic: Garish display on RPi4 with Buster in VNC
Replies: 3
Views: 169

Re: Garish display on RPi4 with Buster in VNC

I'm running buster on an RPi4 from VNC Viewer on a 1920x1080 monitor. I've edited /boot/config.txt as follows: framebuffer_width=1900 framebuffer_Height-1024 The resulting display fills the screen, but the windows and the text on the taskbar are about twice as big as I want. The screen is garish. I...
by ejolson
Thu Aug 22, 2019 4:39 am
Forum: General programming discussion
Topic: Liberation through Computer Literacy
Replies: 1095
Views: 41457

Re: Liberation through Computer Literacy

Apart from Python, 64bit is about 10% faster. Are they all A72 optimized compilers? What speed difference between A53/A72/? I would have expected a bit better than 10% with the extra registers available in 64bit mode. Rust is looking good :D Not bad for someone still learning Rust :lol: Would a D v...
by ejolson
Thu Aug 22, 2019 2:39 am
Forum: General programming discussion
Topic: Liberation through Computer Literacy
Replies: 1095
Views: 41457

Re: Liberation through Computer Literacy

The canine coder said with a growl, de-mouser is just a clever way of saying cat and I'm not logging in as a cat. Consequently, there have been some delays with the 64-bit testing. I ran some of the insane British anagram challenge winners in 64-bit mode on the Raspberry Pi 4B using this Gentoo ima...
by ejolson
Thu Aug 22, 2019 1:25 am
Forum: General discussion
Topic: Why moving to 64bit?
Replies: 203
Views: 9787

Re: Why moving to 64bit?

Here are the openssl results for a Pi 4B running this 64-bit Gentoo image. $ openssl speed -evp aes-256-gcm Doing aes-256-gcm for 3s on 16 size blocks: 6665953 aes-256-gcm's in 3.00s Doing aes-256-gcm for 3s on 64 size blocks: 1789838 aes-256-gcm's in 3.00s Doing aes-256-gcm for 3s on 256 size block...
by ejolson
Wed Aug 21, 2019 6:18 pm
Forum: General discussion
Topic: Uses for Raspberry Pi Zero/Zero W?
Replies: 54
Views: 1455

Re: Uses for Raspberry Pi Zero/Zero W?

but what else could you use them for? In my case, as a USB gadget, firing F1 into a notional keyboard buffer, to get around my router's braindead BIOS (with the classic 'CMOS corrupt -- press F1 to continue' cretinism) and flat battery after a powercut. It's easier than replacing the battery. That ...
by ejolson
Wed Aug 21, 2019 6:04 pm
Forum: General discussion
Topic: Ideal SD Card Size for Raspberry PI 4
Replies: 16
Views: 525

Re: Ideal SD Card Size for Raspberry PI 4

At Micro Center for example, the store brand 16 GB is $3, 32 GB is $3.50, and 64 GB is $7. So 16 GB is out of the question, and I chose 32 GB which is probably more than enough. The card doesn't have stellar IOPS or speeds, but the system works just fine. I just purchased two 16GB cards with the Mi...

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