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by chwe
Tue Jan 29, 2019 11:21 am
Forum: Off topic discussion
Topic: A step forward: LTE
Replies: 26
Views: 2611

Re: A step forward: LTE

what's the goal. having Kali Linux with an SBC... I don't know if it uses a linux kernel with a couple of unofficial drivers or many unofficial drivers or a android kernel ?! The case 1 is ok, the case 2 i dont know, the case 3 NO! Then there is another problem, that soc (MT6797X) is a bit old and ...
by chwe
Mon Jan 28, 2019 3:48 pm
Forum: Off topic discussion
Topic: A step forward: LTE
Replies: 26
Views: 2611

Re: A step forward: LTE

what's the goal. having Kali Linux with an SBC which has a cellular? Find a cellular stick which works and then debootstrap your own Kali.. armhf/arm64 packages are there - it's just a sort of debian so getting kali to run on random SBC isn't much an issue as long as someone got a debian running on ...
by chwe
Sat Jan 26, 2019 11:02 pm
Forum: General discussion
Topic: Worth an upgrade for speed?
Replies: 20
Views: 982

Re: Worth an upgrade for speed?

If you had read the thread yourself, you would know that Powerline adaptors are not necessarily capable of the maximum specified, that could well be the bottleneck. By ignoring that you damage your own credibility. and that's why people use iperf... to nail down if it's the wiring or not (iperf can...
by chwe
Sat Jan 26, 2019 7:35 pm
Forum: General discussion
Topic: Worth an upgrade for speed?
Replies: 20
Views: 982

Re: Worth an upgrade for speed?

However, I had assumed the OP has a 100baseT network, which may have been presumptious. If it's 100baseT there's no need for and update.. If the wires anyway only allow fullspeed, why should you go to a 3b+ any fullspeed capable pi will do it. RPi2 to OrangePi PC+ (both fullspeed onlycapable SBCs) ...
by chwe
Sat Jan 26, 2019 5:45 pm
Forum: General discussion
Topic: SD Card speed - Pi limitation ?
Replies: 20
Views: 4452

Re: SD Card speed - Pi limitation ?

Back to A1 and A2... Can the Pi make use of A2 yet? Have drivers or whatever is needed been made? Good question. A2 cards work fine on the Pi of course, I use them on three Pi's. But I don't know if the drivers are sorted yet and the full 4000 IOPS are available. If not, I doubt it will be long to ...
by chwe
Sat Jan 26, 2019 5:29 pm
Forum: General discussion
Topic: Worth an upgrade for speed?
Replies: 20
Views: 982

Re: Worth an upgrade for speed?

You should get at least double the ethernet speed on the 3B+, and the Wifi will be faster as well. seriously? recommending just the newest RPi and everything is fine? What's about finding first the bottleneck and then suggesting a fix? Is it the reason why RPT sold roughly 20M boards? :lol: The pi3...
by chwe
Sat Jan 26, 2019 4:46 pm
Forum: Off topic discussion
Topic: A step forward: LTE
Replies: 26
Views: 2611

Re: A step forward: LTE

Thats exactly what I was talking about ! There are a lot of cellular SOCs but (almost) none can be installed a linux! Also, no dev boards. Why ? Why would a chip maker develop the support for android and not linux ??? Qualcom website is extreamly closed. Find support for a product is a tresure hunt...
by chwe
Sat Jan 26, 2019 2:43 pm
Forum: General discussion
Topic: SD Card speed - Pi limitation ?
Replies: 20
Views: 4452

Re: SD Card speed - Pi limitation ?

just saw the first 400gb SanDisk A1 for 90$ in a local store (if they cheat, I could simply replace it.. ) obviously it's a dump idea to buy 400gb SD-Cards.. :D SSD is the better storage.. in terms of durability & speed, that's no question. But then I would go for an SBC which is focused for such an...
by chwe
Fri Jan 25, 2019 7:20 pm
Forum: General discussion
Topic: SD Card speed - Pi limitation ?
Replies: 20
Views: 4452

Re: SD Card speed - Pi limitation ?

it's a waste of money to connect a fast SSD to a RPi which only has a shared USB2 port.. Didn't say it's a waste of money to buy a Pi and boot it with a SD-Card... If you spend >100$ for a reliable fast SSD then there are better SBCs to use it.. they cost (mostly) a bit more but there are a bunch of...
by chwe
Fri Jan 25, 2019 6:59 pm
Forum: General discussion
Topic: Auto running a program after boot
Replies: 41
Views: 34210

Re: Auto running a program after boot

didn't read the whole thread (so I might miss something obvious :lol: ).. but why do you guys not use a process manager to fire up your node.js programs? E.g. similar to this tutorial for node-red?
https://diyprojects.io/install-node-red ... EtbuS0o_b0
by chwe
Fri Jan 25, 2019 6:53 pm
Forum: General discussion
Topic: SD Card speed - Pi limitation ?
Replies: 20
Views: 4452

Re: SD Card speed - Pi limitation ?

general use involves random 4k/16k... drivers get called, logs get written etc. the USB, which the RPi has only one, which is shared between all USB ports and network limits your 400mbit/s quite soon.. whereas the SDIO interface for SD-Cards is independent.. IMO the only two reasons to attach USB st...
by chwe
Fri Jan 25, 2019 4:19 pm
Forum: General discussion
Topic: SD Card speed - Pi limitation ?
Replies: 20
Views: 4452

Re: SD Card speed - Pi limitation ?

What about using an external SSD? Is it still 23MB/s or is it up to the USB Hub bus speed? It's up to the USB speed as it has nothing to do with the SD card interface. So my SD card would perform better if Instead, I booted the Raspberry Pi with an SD card, but the SD card is in USB SD card reader?...
by chwe
Fri Jan 25, 2019 2:51 pm
Forum: General discussion
Topic: SD Card speed - Pi limitation ?
Replies: 20
Views: 4452

Re: SD Card speed - Pi limitation ?

http://www.iozone.org/ also available for arm.. ;) The SD cards that we supply preformatted with NOOBS are optimised for random read/write performance - typically 1.5MB/s random write, ~6MB/s random read. Dedicated performance testers like bonnie++ or Crystaldiskmark can test these access partterns....
by chwe
Fri Jan 25, 2019 1:51 pm
Forum: Off topic discussion
Topic: A step forward: LTE
Replies: 26
Views: 2611

Re: A step forward: LTE

if you find a 4g capable SoC with decent mainline Linux support (we're talking here about linux not some crappy android bsp kernel) which only adds 5$ to a pi.. definitively yes! :lol: http://www.orangepi.org/Orange%20Pi%204G-IOT/ .. I spend quite a few hours with the sources for the 4G-IoT, kernel...
by chwe
Fri Jan 25, 2019 1:12 pm
Forum: Off topic discussion
Topic: A step forward: LTE
Replies: 26
Views: 2611

Re: A step forward: LTE

I've explained above why built in LTE is a non-starter. Do you still think it would be a good idea if it added $5 to the price of every Pi with it on, even if the vast majority of people never actually used it? if you find a 4g capable SoC with decent mainline Linux support (we're talking here abou...
by chwe
Wed Jan 16, 2019 12:27 pm
Forum: General discussion
Topic: DSI 5 inch screen
Replies: 15
Views: 1821

Re: DSI 5 inch screen

I wonder how they got access to the closed source drivers required??? i think they are do reverse engineering(China's best of do :lol: ). hardest point is resolution and it is same with 7" orginal device. only different is screen size. it is not so hard after cloning DSI communication using signal ...
by chwe
Tue Jan 08, 2019 10:19 pm
Forum: General discussion
Topic: Using RPI with camera below 0 Celsius?
Replies: 27
Views: 1236

Re: Using RPI with camera below 0 Celsius?

Condensation kills electronics, not subzero temperatures. you're aware of 'tin pest' (aka alpha tin or gray tin). I don't know what alloys you use for soldering but it's definitively not always only a condensation issue.. It may not fail immediately but it can happen over time... So all those reall...
by chwe
Tue Jan 08, 2019 1:19 am
Forum: General discussion
Topic: Observation fluorescence with the Raspberry Pi camera
Replies: 6
Views: 399

Re: Observation fluorescence with the Raspberry Pi camera

I have found 'the' spectra response curves for the raspberry pi camera v2 on https://khufkens.github.io/pi-camera-response-curves/, project maintained by khufkens. But why are there three curves? Cause it's a composition of three sensors, one for green one for red and one for blue ( https://en.wiki...
by chwe
Fri Jan 04, 2019 3:35 pm
Forum: General discussion
Topic: Default swap file size
Replies: 20
Views: 1307

Re: Default swap file size

IMO those are two 'solutions' to have even more trouble.. :lol: swap is supposed to be fast! It's just a protection mechanism to avoid oom situations.. therefore swap has to be on the fastest memory (besides ram) available.. keep in mind we talk here about random access so random reads and writes ar...
by chwe
Thu Jan 03, 2019 11:54 pm
Forum: General discussion
Topic: Default swap file size
Replies: 20
Views: 1307

Re: Default swap file size

yeah, you only have 50% of ram after its.. But the goal is then to let swap happening.. you've a bit of overhead but who cares? It's still a way faster than accessing some small junk files on swap. you can then start to play around with swappiness.. don't set it to low, we want that swapping happens...
by chwe
Thu Jan 03, 2019 8:50 pm
Forum: General discussion
Topic: Default swap file size
Replies: 20
Views: 1307

Re: Default swap file size

did you guys ever played with zram? https://wiki.ubuntuusers.de/zRam/ actually RPis 4.14 kernel should allow it ( https://github.com/raspberrypi/linux/blob/a0911976a8732eb0d9ad1088865e60e1f28c0099/arch/arm/configs/bcmrpi_defconfig#L402 ). Never used it in desktop scenarios but for headless, it does ...
by chwe
Thu Jan 03, 2019 3:52 pm
Forum: General discussion
Topic: M.2 on Raspberry Pi 4
Replies: 13
Views: 10197

Re: M.2 on Raspberry Pi 4

the m.2 isn't that much a mess.. It's a perfect connector to see if people do their homework first before they start buying stuff.. ;) for your size problem there are adapters made.. One of the competitors sells them (hint, they recently made a board which has the same formfactor except they use USB...
by chwe
Thu Jan 03, 2019 3:20 am
Forum: General discussion
Topic: M.2 on Raspberry Pi 4
Replies: 13
Views: 10197

Re: M.2 on Raspberry Pi 4

Future gen? Not very likely. Why would anyone spend time, money and effort adding what is, basically a x86-64 interface to an ARM-based SoC that isn't planned to be stuck in server farm? That said, technological crystal balls are notoriously cloudy. But I still wouldn't expect to see any sort of PC...
by chwe
Thu Jan 03, 2019 2:51 am
Forum: General discussion
Topic: Rpi with onboard EMMC storage
Replies: 105
Views: 5442

Re: Rpi with onboard EMMC storage

smart.. those guys.. as said.. those problems are solved.. ;) I think you've once again countered your argument for eMMC to built in to a Pi. why? this adapter isn't supposed to be used the whole time.. :lol: It's only there if you want to program it! e.g. for a Rockchip device and people who don't...
by chwe
Wed Jan 02, 2019 11:02 pm
Forum: General discussion
Topic: Rpi with onboard EMMC storage
Replies: 105
Views: 5442

Re: Rpi with onboard EMMC storage

:D OK will admit I am totally wrong. Raspberry Pi Trading should move to China and use Chinese Government subsidies to produce a multitude of SBCs with ARM64 and x86-64 CPUs. Therefore whenever someone has the next must have idea it can be implemented. :D Unfortunately Raspberry Pi Foundation would...

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