majke
Joined 17 years ago
Karma
5,510
Submissions
903
Member since
Oct 29
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Recent submissions
Comment · 10 days ago
To solve the networking setup, typically some sort of "slirp" is needed. Slirp on one hand takes (fake or real) packets from somewhere and then on the other side pass it to a normal Linux process that does CONNECT / BIND / SEND / RECV.
It turns out you can do all the packet processing magic (connection tracking, syn handling, etc) in userspace totally fine, and then indeed hand it over this to userspace syscalls.
Being upset with classic C-based slirp and rust smoltcp (not enough features) I've dug up Fuchsia userspace tcp/ip stack - netstack - and wrapped it in slirp a-like envelope.
https://github.com/cloudflare/slirpnetstack
So this beast is basically that - on one hand you pass it packets (potentially from inside container) on the other hand it does connect/bind/etc to host OS.
This approach, in one form or another, is used by tailscale, podman and many other container runtimes.
Comment · 1 month ago
8. 80.239.216.210. 0.0% 78 123.2 64.6 42.9 141.8 30.6
9. vl202.zur-itx1-dist-1.cdn77.com. 0.0% 78 60.1 58.8 43.7 136.5 24.2
10. 89-187-165-194.bunnyinfra.net. 0.0% 78 45.9 63.5 41.8 131.9 31.0
Comment · 2 months ago
First version was a three layer VM monster, with the main entrance done as HTTP proxy written in PHP.
Comment · 2 months ago
>> made the internet better
One of the measures of "making The Internet" could be looking at RFC contributions:
Comment · 3 months ago
I don't think you can buy a single "MI300X" unit, right? Only the box with x8 of these at a cost of ~250K EUR.
Comment · 3 months ago
> Across all tested generations, divergent paths serialize linearly with the number of paths k, following T(k)≈sk with no super-linear reconvergence penalty. Warp execution efficiency falls as 32/k, the penalty is independent of occupancy, and predication removes the serialization cost
So... Nvidia did a good job?
Comment · 3 months ago
There is more! I started to figure out how ADC/DAC chips actually work. I believe our CM6533 and its competitor the CM108 both use delta-sigma. The output isn't a staircase of those samples but a rapidly switching (MHz rates) 1-bit modulator (think: PCM) output, and a final analog filter smooths it into a continuous waveform.
Comment · 3 months ago
Many countries now assume you have a phone. For example getting UK visa requires a smartphone. I don't think going without a phone is feasible nowadays.
Another question is if going with a burner phone that has just sim card and bank card, sufficient. But then you need appleid/google account on the device, and this again links back to your phone number, and it's not easy in practice to have proper clean device.
Comment · 3 months ago
I'm a heavy user of NVIDIA LOP3 instruction (uint32). I wonder when AMD will finally support it well.
Comment · 3 months ago
If you want to know more about the cache invalidation in the whole pipeline of DNS requests, take a look at this
https://blog.cloudflare.com/tld-glue-sticks-around-too-long/
I hinted there how the NS chain of lookups works from . to your domain. The point is that we wanted to be able to move name servers around the ip addresss, but that wouldn't work for many domains. So - in some contexts moving IP's rapidly is possible, in some it's not. Fun.
Comment · 4 months ago
sockmap has been through a lot of changes since then. Some done by CF (hi Jakub!) some by others, including bytedance and isovalent.
Recently there has been a push to figure out the backpressure situation, so it's worth checking again.
Marek
Comment · 4 months ago
This is great. So proper 386 on an fpga? How cool is that.
Comment · 4 months ago
> A lot of self-hosters running CF tunnels because they don't know better also contributes.
Are you saying CF documentation is better than Computer Science / Networking education resources? Why don't people know better? I thought the tunnels are mostly used to bypass NAT's.
> Static blogs hiding behind bot protection
I'm not sure what is the proportion of the static vs dynamic sites, but I would argue that for wordpress CF is adding real value.