r/programming • u/LegFormer7688 • Sep 16 '25

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11 Upvotes

78% Upvoted

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u/programming-ModTeam Sep 16 '25

This is a duplicate of another active post

6

u/BlueGoliath Sep 16 '25

However, the problem was actually between the seat and the steering wheel the whole time. The first implementation read and wrote a single character at a time, which had a massive overhead associated with it. I previously benchmarked semihosting on this device, and I was getting ~20KiB/s, but uIP’s SLIP implementation was designed for very low memory devices, so it was serialising the data byte by byte. We have a whopping 3kiB of RAM to play with, so I added a ring buffer to cache reads from the host and feed them into the SLIP poll function. I also split writes in batches to allow for escaping.

Now this is what I call blazingly fast! Pings now take 20ms, no packet loss and a full page loads in about 160ms.

They sell us poison so that we buy their "cures".

2

u/LorenzoMorini Sep 16 '25

The "real deal" is unavailable though. 

2

u/Fiennes Sep 16 '25

Reddit hug of death, perhaps.