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Raspberry Pi 5

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Re: Raspberry Pi 5

#201

Post by eurekin »

peteforde wrote: post #197
dogma1138 wrote: post #183

Earlier quoted context omitted.

Won’t you still need an NTP or a GPS time module unless the RTC has a battery backup? How many applications would you have where timing is critical but you won’t have an external time reference that would be still viable without a guaranteed power backup?

Nobody said anything about not having NTP in the loop! Here's the deal: RPi The first thing we did was deliver 12V down the wire with a high quality power supply. Then we used UBEC buck converter modules (intended for RC quadcopters) to deliver power directly into the Pi via its pins. However, even now you're just chasing physics. There's no way to send a command to all of the Pis to do something right now . Instead,…

Oh my.. Please, can you share more about it? Some NDAs about the function of that pi fleet?

Re: Raspberry Pi 5

#202

Post by dmitrygr »

yjftsjthsd-h wrote: post #181
lloydatkinson wrote: post #114

Five generations in and it finally gets radical features such as: - a power button - a real time clock Crazy it took this long but finally, seriously. Downsides here are that it might need more active cooling whereas previous generations worked without it. Also, ugh: > Gigabit Ethernet, with PoE+ support (requires separate PoE+ HAT)

All I want is UEFI so we can stop having per-device images. Is that so much to ask?

rPI went from armv6 to armv7 to armv8. CortexA76 does not even support using 32 bit kernels. Rp1 requires an armv6 32 bit kernel. There is NO kernel build on earth that would run on both an pi1 and a pi5 and no amount of efi would help. (I am ignoring the possibility of custom nasty hacks to make a polyglot kernel). We’ll have per-device images until we standardize on a single architecture or at least a subset of one.

And no, you really wouldn’t want a lowest common denominator build anyways. That would leave a lot on the table.

Re: Raspberry Pi 5

#204

Post by dheera »

ytch wrote: post #68

Out of curiosity, does 5V/5A USB-C changer common? All of my USB-C Chargers has 5V/3A only.

Oof, this sucks. I wish they supported the wide variety of Anker/Apple/etc. USB-PD chargers out there that can deliver 100W so I can use my existing power bricks. None of them do 5V5A though, they just created yet another nonstandard piece of "USB-C" equipment and it's going to suck.

Re: Raspberry Pi 5

#205

Post by peteforde »

uxp8u61q wrote: post #200
peteforde wrote: post #197

Earlier quoted context omitted.

Nobody said anything about not having NTP in the loop! Here's the deal: RPi The first thing we did was deliver 12V down the wire with a high quality power supply. Then we used UBEC buck converter modules (intended for RC quadcopters) to deliver power directly into the Pi via its pins. However, even now you're just chasing physics. There's no way to send a command to all of the Pis to do something right now . Instead,…

I may be completely off base here, but maybe the rpi wasn't the best tool for the project then? What was it, if I may ask?

I mean, I'd be curious what you'd have suggested!

We needed it to be small, low power, low heat, provide hardware level access to a camera module, be ethernet accessible. Oh, and under $100 including a fixed M-mount lens.

At the time, it didn't seem like rolling our own hardware would have been faster.

I would argue - given we succeeded at sub 1ms syncronization - that the Pi was close to the perfect tool.

It just would have been even more perfect if it had an RTC.

Re: Raspberry Pi 5

#206

Post by futureshock »

I think it’s notable that the chip powering the RP5 is built on a 16nm process. (The RP4 was on 26nm).

This is a nearly 10 year old manufacturing process and it’s silly to compare the performance per watt to any Intel or Arm chip on the market today. On such an old node, it’s not surprising that the power draw is so high. Of course an M2 would smoke a RP5 at a much lower power. But the RP5 is 60 bucks!

Re: Raspberry Pi 5

#207

Post by dheera »

isoprophlex wrote: post #6

I'm happy that they're upgrading the pi, but it's not exactly lightweight computing in terms of power (they recommend a 27W PSU) or performance/watt (see: your cell phone) To me the charm of the raspi ecosystem was always in giving you a very low power, "always on, almost no power draw" linux environment. Oh well, I guess there's always the older versions or the zero for that.

The worst part about it is they require a nonstandard, USB-C standard-violating proprietary power brick that does 5V5A.

None of your 100W Anker or Apple power bricks will supply this. They'll do 12V3A, 12V5A, 20V5A, but not 5V5A.

Yet another piece of nonstandard USB-C equipment.

Re: Raspberry Pi 5

#208

Post by zweifuss »

mytailorisrich wrote: post #85
ytch wrote: post #68

Out of curiosity, does 5V/5A USB-C changer common? All of my USB-C Chargers has 5V/3A only.

5V/5A means at least 25W. Plenty of chargers at that level and above on Amazon.

I just did a quick review on Amazon of adapters ranging from 30 to 120W. Not a single one claimed to support 5V/5A DC. Only a couple claimed 5V/4.5A and they were expensive. 5V/3A is common in the $15+ category.

Re: Raspberry Pi 5

#209

Post by peteforde »

eurekin wrote: post #201
peteforde wrote: post #197

Earlier quoted context omitted.

Nobody said anything about not having NTP in the loop! Here's the deal: RPi The first thing we did was deliver 12V down the wire with a high quality power supply. Then we used UBEC buck converter modules (intended for RC quadcopters) to deliver power directly into the Pi via its pins. However, even now you're just chasing physics. There's no way to send a command to all of the Pis to do something right now . Instead,…

Oh my.. Please, can you share more about it? Some NDAs about the function of that pi fleet?

Unfortunately, I probably can't share much more than the above.

However, if you have more specific technical questions, I'll try to do my best.

Re: Raspberry Pi 5

#210

Post by moffkalast »

foggywin wrote: post #71
isoprophlex wrote: post #6

I'm happy that they're upgrading the pi, but it's not exactly lightweight computing in terms of power (they recommend a 27W PSU) or performance/watt (see: your cell phone) To me the charm of the raspi ecosystem was always in giving you a very low power, "always on, almost no power draw" linux environment. Oh well, I guess there's always the older versions or the zero for that.

Did you read the blog post? :) "Raspberry Pi 5 consumes significantly less power, and runs significantly cooler, than Raspberry Pi 4 when running an identical workload. However, the much higher performance ceiling means that for the most intensive workloads, and in particular for pathological “power virus” workloads, peak power consumption increases to around 12W, versus 8W for Raspberry Pi 4."

Alright so 27W with heavy peripheral draw then? But 12 W still means it'll be drawing 2.4 amps instead of 1.6 when a random process decides to 100% it. I guess we can always underclock it.

The real unanswered question is, does it finally have a damn sleep mode so it can save power when idle.

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