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by chwe
Sat Jan 26, 2019 2:43 pm
Forum: General discussion
Topic: SD Card speed - Pi limitation ?
Replies: 20
Views: 11418

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: 11418

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: 45105

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: 11418

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: 11418

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: 11418

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: 3308

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: 3308

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: 16
Views: 2877

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: 2115

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: 738

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: 4345

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: 4345

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: 4345

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: 28709

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: 28709

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: 9958

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: 9958

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...
by chwe
Wed Jan 02, 2019 7:36 pm
Forum: General discussion
Topic: Rpi with onboard EMMC storage
Replies: 105
Views: 9958

Re: Rpi with onboard EMMC storage

https://en.wiktionary.org/wiki/blue-sky_thinking (1) Synonyms: open-minded thinking well, I still hope that the devs here are open minded.. otherwise you'll hit the ground quite soon. Yes it is an investment for the next generation of Pis to have an eMMC connector but it might be worth it. For the ...
by chwe
Wed Jan 02, 2019 5:08 pm
Forum: General discussion
Topic: M.2 on Raspberry Pi 4
Replies: 13
Views: 28709

Re: M.2 on Raspberry Pi 4

4 x the price of the Raspberry Pi and about the best you will find, though does not support PCIe graphics: http://shop.t-firefly.com/goods.php?id=45 Please can you purchase and report back quality of product and what if any community support. or https://www.pine64.org/?page_id=61454 for roughly dou...
by chwe
Mon Dec 31, 2018 1:59 pm
Forum: General discussion
Topic: Rpi with onboard EMMC storage
Replies: 105
Views: 9958

Re: Rpi with onboard EMMC storage

Which uses a completely different SOC, which means a completely different way of wiring everything up, perhaps less overlapping traces, maybe more layers, who knows. Its certainly a lot more expensive than a Pi. which is roughly the same size or bigger than the RPi SoC (don't have a Pi at hand to c...
by chwe
Mon Dec 31, 2018 3:38 am
Forum: General discussion
Topic: Rpi with onboard EMMC storage
Replies: 105
Views: 9958

Re: Rpi with onboard EMMC storage

xxx Of all the above, I understand that the new versions of Raspberry will have no progress. It will be the same thing in a different size, as Raspberry Pi 3 Model A + is the same as Raspberry Pi 3 Model B +. We have no evolution and improvement Everything we have done so far has evolved the origin...
by chwe
Sat Dec 29, 2018 9:17 pm
Forum: General discussion
Topic: Rpi with onboard EMMC storage
Replies: 105
Views: 9958

Re: Rpi with onboard EMMC storage

chwe I really don't understand your argument. On the one hand you appear to be pro eMMC but part of you argument contradicts this. You've later stated "I don't argue pro eMMC" so which is it? There's no black and white here.. why must it always be the one or the other? Seems to be trendy in those d...
by chwe
Sat Dec 29, 2018 12:00 pm
Forum: General discussion
Topic: Rpi with onboard EMMC storage
Replies: 105
Views: 9958

Re: Rpi with onboard EMMC storage

Did you miss my post above? Indeed that one got missed... Sorry for that. TL;DR. Suffice to say, we are very unlikely to put EMMC on the standard boards, there just isn't the demand for it (and no, three people in here does not constitute demand). It's a cost that would put the price up for everyon...
by chwe
Sat Dec 29, 2018 10:21 am
Forum: General discussion
Topic: Rpi with onboard EMMC storage
Replies: 105
Views: 9958

Re: Rpi with onboard EMMC storage

At this point in time eMMC is not going to happen for the currently available Raspberry Pi SBC's. So as already stated further discussion is not needed. you must have some insider knowledge here.. normally people here are quite surprised what the 'new RPi' will have. :lol: Regards other SBC's havin...

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