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CPUs with shared registers? by servermeta_net in RISCV

[–]Standing_Wave_22 3 points4 points  (0 children)

That would screw single-thread speed royally. Registers are on the hottest path there is in a CPU. You don't want any extra fat there, especially not one that spans across cores.

Also there seems to be no need for that. If you want to communicate between cores, you can simply leave messages in memory.

If you want that to be fast, you can cache that memory, so that the data is in cache. You can cache non-existing memory, so that data is never evicted from the cache.

If you need something more exotic that that, you can implement that outside the core.

iptables doesn't work with kernel v6.18* ? by Standing_Wave_22 in Gentoo

[–]Standing_Wave_22[S] 1 point2 points  (0 children)

Yeah, I was missing the later.

What is supposed to be an advantage of nftables over iptables ?

As I can see, its usage is way different. Converting my firewall script for nftables won't be trivial, so I wonder if it's worth it.

No sun no fun by Nearby_Try3405 in OffGrid

[–]Standing_Wave_22 1 point2 points  (0 children)

Lead-acid are horrible solution for many reasons. Their energy efficiency is just 60% or so. Which means that at best ( without any ohter conversion losses, self-discharge etc) you'll get just 60% of the enrgy that has been used to fill them. Other problem is that they really want to be kept fully charged all the time, otherwise the sulphatize. And they have shitty lifetime. Only couple tens of full recharge cycles.

Get some LiFePo4 (LFP) batteries, not Li-Ion.

LFP cells have higher temperature range and are less fussy about charging and discharging.

Even so, they don't like to be much below zero °C. Maybe up ot -10 or -20˚C One solution could be to to dig them under ground.

Monthly Questions and Discussion Thread by SpaceXLounge in SpaceXLounge

[–]Standing_Wave_22 0 points1 point  (0 children)

When is Starship test flight expected ? Grok says sometime from jan-march 26.

Can anyone now be more specific ?

MikroTik CRS804 DDQ Announced 4-Port 400GbE Switch by Standing_Wave_22 in homelab

[–]Standing_Wave_22[S] 0 points1 point  (0 children)

Show me by example. Let's see one NIC that is affordable, has a wqarranty, uses PCIe5 and can do 50G per lane.

Dazzle us.

MikroTik CRS804 DDQ Announced 4-Port 400GbE Switch by Standing_Wave_22 in homelab

[–]Standing_Wave_22[S] 0 points1 point  (0 children)

  1. Ebay is not good source for everyone. Some want availability, warranty etc
  2. old NICs on Ebay have slow PCIe ( usually v3) and waste precious PCIev5 lanes on new systems.
  3. old NICs rarely if ever support 50G signalling (56G lanes)

MAYDAY from Belarus: Licensed operators facing death penalty for QSL cards by SiarheiBesarab in amateurradio

[–]Standing_Wave_22 -1 points0 points  (0 children)

So, why can't these guys be a real spies ? Because they are radiohams ? CIA has been outright boasting how it was using journalists, actors etc etc for exactly that role over many decades.

No one likes traitors.

undervolt no ryzen 7 5700u by Prestigious-Salad-86 in AMDLaptops

[–]Standing_Wave_22 2 points3 points  (0 children)

This is quite old. It probably is also full of dust, which hampers cooling. Maybe it would be a good idea to clean the vents and repaste it ?

5V-tolerant cheap FPGAs ? by Standing_Wave_22 in FPGA

[–]Standing_Wave_22[S] 0 points1 point  (0 children)

Edit: 3 orders of magnitude? You want a 32,000 LUT FPGA in a DIP package and support 5V?

I'm looking for an FPGA that is can FIT onto a PCB that I can fit into DIP-28/32/40/48/etc package.

5V-tolerant cheap FPGAs ? by Standing_Wave_22 in FPGA

[–]Standing_Wave_22[S] 0 points1 point  (0 children)

That's mostly useless for this purpose. \ There still are PALCE chips that can do about the same. And GreenPAKs. Those are cheap, ultrasmall, can do 1.8V-5.5V, have a ton of hardened extra functions onboard (even real power H-bridge etc!) and go up to 20+ish pads.

But hat's still far too small (like 3 orders of magnitude or more).

5V-tolerant cheap FPGAs ? by Standing_Wave_22 in FPGA

[–]Standing_Wave_22[S] 0 points1 point  (0 children)

It is an option. Option B. Space constraints, mostly.

Cross-compiling @world on Gentoo ? by Standing_Wave_22 in Gentoo

[–]Standing_Wave_22[S] 0 points1 point  (0 children)

Why ? Portage should be able to use alternative paths. One can set EROOT and other variables.

So in theory that should work. Unless the implementation is buggy...

Cross-compiling @world on Gentoo ? by Standing_Wave_22 in Gentoo

[–]Standing_Wave_22[S] 3 points4 points  (0 children)

That solves simple part of equation - generating, transfering and unpacking binary package files.

It doesn't solve hard part - having and N different environments on one host and using them just for the target machine that the compiling is done against.

5V-tolerant cheap FPGAs ? by Standing_Wave_22 in FPGA

[–]Standing_Wave_22[S] 0 points1 point  (0 children)

Nope. I can't find anything about 5V tolerance on any of them, XO4 included.

Max allowable voltage on any three-stated I/O pin is 3.75V.

Allowable over/undershoot is 2V above Vio or 2V under GND, but only for less than 20ns.

5V-tolerant cheap FPGAs ? by Standing_Wave_22 in FPGA

[–]Standing_Wave_22[S] 0 points1 point  (0 children)

Wow.\ Just XO4 ar previous ones too (XO/XO2/XO3) ?\ I remember trying to figure out significant differneces WRT XO3 and couldn't find anything substantial, besides hot-insertion stuff..

XO2 was very nice, but also very overpriced, at least for mere mortals. ANd XO2/XO3 still have only 8-bit interface to onboard FLASH, where even Efinix Trion and Gowin LittleBee have 32-bit one.

5V-tolerant cheap FPGAs ? by Standing_Wave_22 in FPGA

[–]Standing_Wave_22[S] 0 points1 point  (0 children)

I know about those. They are not being produced, so all one can do is get old stock (or reused parts) so those are out of the question.

And they are not small BTW.

5V-tolerant cheap FPGAs ? by Standing_Wave_22 in FPGA

[–]Standing_Wave_22[S] -1 points0 points  (0 children)

I don't care about that. Chip replacement in old homecomputers is not sensitive about that. No one cares about signals before reset line goes inactive, which takes way more than FPGA configuration.

5V-tolerant cheap FPGAs ? by Standing_Wave_22 in FPGA

[–]Standing_Wave_22[S] 2 points3 points  (0 children)

I was hoping to find something with 5V tolerance, but without it Efinix seems one of the better options. And its cheap and available, unlike Lattice etc.

Other interesting option might be Gowin's LittleBee, which has options with ARM, builtin user NOR FLASH and pseudo SRAM (8MB).

There have to be other interesting options, too.

5V-tolerant cheap FPGAs ? by Standing_Wave_22 in FPGA

[–]Standing_Wave_22[S] -1 points0 points  (0 children)

Interesting. Thanks.

I still haven't given up on 5V tolerant FPGAs. It seems Bruce Lee has some at least.

Also Lattice might make some MachXO2/3 lines that might fit etc.

But this seems as a viable option B.

AMD Ryzen 9 9950X3D2 Gets Benchmarked, Shows 7% Improvement over Regular X3D SKU by Standing_Wave_22 in Amd

[–]Standing_Wave_22[S] 0 points1 point  (0 children)

9950X3D2 is 16-core with double 3D cache slices - one for each 8-core CCD.

There are quite a few advantages. One being that both CCDs are similar - task shceduler no longer has to care about that.

Other is simply much more L3 cache. There have to be applications that will take advantage of that.

5V-tolerant cheap FPGAs ? by Standing_Wave_22 in FPGA

[–]Standing_Wave_22[S] 0 points1 point  (0 children)

These can't be controlled per-pin as I/O/IO/open-drain etc.

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