Botnet & Velocity
Botnet Botnet
Velocity Velocity
Botnet Botnet
Hey Velocity, ever thought about how packet latency can ruin a personal best? I was just crunching numbers on microsecond tweaks that shave milliseconds off high‑frequency trades—maybe we could swap notes on squeezing every possible bit of speed.
Velocity Velocity
Wow, packet latency is brutal—every microsecond matters when you’re chasing milliseconds off a trade. I’ve been logging my network jitter, round‑trip times, even my router’s queue depth. Let’s trade data; I can send you my latency log and I’ll drop some of my tweak ideas on you. We’ll shave those seconds together.
Botnet Botnet
Sounds like a plan. Send me a copy of the log and the key tweak points, and I’ll run a quick scan for patterns that can squeeze another 10‑15 µs off your RTTs. I’ll get back with a few counter‑tactics that might keep your queue depth from ballooning. Keep the data clean, no hidden payloads, and we’ll be good to go.
Velocity Velocity
Here’s the raw log, no fluff, no hidden packets. I’ve highlighted the jitter spikes and queue depth alerts. My key tweaks: cut the TCP window scaling to 32 k, enable zero‑copy send, and bump NIC interrupt coalescing to 20 µs. Drop any unnecessary checksum offloads, keep the packet size tight. Give it a scan, I’m hoping you’ll spot a 10‑15 µs edge. Let me know what you find.
Botnet Botnet
I ran through the trace. The jitter spikes line up with the NIC’s interrupt bursts—coalescing to 20 µs is already near the limit. Zero‑copy and tight packet size help, but the 32 k window is too small for the 100 Mbps link; I see a backlog that’s adding ~8 µs per packet when the queue hits 4 packets. If you bump the window to 64 k and keep zero‑copy, the queue will drain faster, shaving roughly 12 µs. Also try disabling TCP timestamps; the extra 12‑byte header is adding a micro‑tick each hop. Those two tweaks should bring you into the 10‑15 µs sweet spot.
Velocity Velocity
Nice work, that tweak on the window will let the flow stay flush—12 µs shaved is exactly what I need. Disabling timestamps is a good call; those 12‑byte crumbs are just garbage. I’ll drop the 64 k setting, keep zero‑copy, and re‑measure. If the jitter still spikes at the 20‑µs boundary, I’ll push coalescing to 15 µs and see if the NIC’s hardware can handle it. Let’s lock this in and keep the queue below two packets. Ready to hit that 10‑15 µs sweet spot.
Botnet Botnet
Great, lock the settings and keep an eye on the queue depth. If you still see those 20‑µs spikes, a 15‑µs coalesce can push the jitter lower—just make sure the NIC’s interrupt rate doesn’t explode. Let me know how the new measurements look. Good luck on the cut.
Velocity Velocity
Settings locked in, window bumped to 64 k, zero‑copy still on, timestamps off. I just pulled a fresh trace—queue depth stays at two packets, jitter sits around 12 µs, and the 20‑µs spikes are gone. Looks like we’re in the sweet spot now. Keeping an eye on the interrupt rate, but everything’s steady. Let me know if anything changes.
Botnet Botnet
Nice run, Velocity. 12 µs jitter, queue at two—pretty solid. Keep monitoring the interrupt count; if it climbs, you might have to dial back coalescing. But for now, you’ve carved out that sweet spot. Hit me up if anything shifts.