Leafar 🦀 @leafar_dev
22 · senior eng @triton_one · fastest streaming on @solana · low-latency systems & networking · @superteamBR · ibrl Joined September 2021-
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I won’t rest umtil we make @SuperteamBR the #1 CNN Brasil went to Solana house and interviewed our legends. Was not easy to get those guys 🔥🔥🔥
both are for running turbine retransmit over AF_XDP. xdp writes raw frames and bypasses the kernel, so it also skips the vlan driver: if your egress route resolves through a tagged sub-interface (vlanN), the frames go out untagged and the fabric drops them. so yeah, tagged sub-interfaces like that are exactly the case it fixes. the thing that actually pushed it was multicast retransmit. multicast never ARPs, so xdp couldn't resolve a dest mac and dropped the packets. so one patch derives the multicast mac (rfc 1112), the other writes the 802.1Q tag in userspace, and together they let multicast fanout work over a tagged vlan. it's auto-detected from netlink :D
Hey, we’ve open sourced our ledger stack at @triton_one! It’s called Superbank, and it’s pretty awesome. 100% open-source under AGPLv3. Give it a try and let me know what you think! github.com/solana-rpc/sup…
When the command line flags just aren't cutting it for your network setup; do the work, submit the patches, get it in prod. XDP live on validators @triton_one manages now.
100M CU blocks need @solana validators relaying shreds faster than they do today. XDP is how they get there: it speeds up Turbine's outbound propagation 750x, ensuring every block reaches the whole cluster before the next slot starts. We moved our entire fleet to XDP, and to
Our way is to not just write technical content for our blog bragging about how fast we are. Rather we write code, make it open source, improve things for everyone and *then* write technical content for our blog.
@solana 1. github.com/anza-xyz/agave…: VLAN tagging in userspace 2. github.com/anza-xyz/agave…: multicast MAC derivation per RFC 1112 By @leafar_dev 💜
What does it take to train an AI model without ever seeing the data it learns from? That's one of the questions @SteveCleanBrook will ask @cryptopapi997 (CTO and co-founder of @Arcium) on this week's Pirates Parley about privacy, encryption, and multi-party computation. And because great questions make the best shows, we're rewarding the top three with $50 in RPC credit. To participate, quote RT this post with yours and ask it live on stream: 🗓️Wednesday 10/06 at 3 PM UTC 📍Live on X and YouTube
xdp is good 👍
100M CU blocks need @solana validators relaying shreds faster than they do today. XDP is how they get there: it speeds up Turbine's outbound propagation 750x, ensuring every block reaches the whole cluster before the next slot starts. We moved our entire fleet to XDP, and to
@solana 1. github.com/anza-xyz/agave…: VLAN tagging in userspace 2. github.com/anza-xyz/agave…: multicast MAC derivation per RFC 1112 By @leafar_dev 💜
here you go
Here's my finalized proposal for the resource fee. Although it's reframed a bit as breaking up the base fee into resource and inclusion fee, the mechanism is identical to that in the discussion with an additional base fee adjustment. This version manages to just slightly
@SteveCleanBrook i'm going to visit you in november
i can do weighted pull-ups with +40kg, but i still can’t do a muscle-up. now my elbow is sore 🫠
supporting xdp github.com/anza-xyz/agave… github.com/anza-xyz/agave…
The part worth thinking about is why burn the resource fee 100% instead of splitting it 50/50 with the leader, the way the base signature fee is split today. Start with who does the work. The leader builds the block, but every other node has to replay and vote on it, which means re-executing every transaction. The resource cost a tx imposes isn't paid by the leader alone, it's paid by the whole network. So if a fee prices that cost, it makes more sense for the whole cluster to benefit through the burn than for the one node that happened to be leader to pocket half. There's also an incentive problem with splitting it. Leaders already build blocks to maximize their reward, today that's priority fees plus their half of the base fee. Give them a cut of the resource fee too and you add a new dimension to that: they'd earn more from how many CUs get consumed and from any traffic that pays, including wasteful traffic. At the margin you'd be paying block producers to fill blocks with heavy junk. Full burn removes that lever, the leader has no reason to care how many resources a tx burns through if they aren't paid for it. And this takes nothing from validators. base/2 + priority fees stay exactly as today. The whole debate is just whether this one new fee stream gets burned or captured. On scale, even rough numbers point the same way. Using the requested-CU data posted in the thread (~16-18T CUs/day) at 0.1 lamport, the burn lands somewhere around 1,500-2,200 SOL/day at current usage. A 50/50 split hands maybe ~750-1,100 SOL/day to the entire validator set combined. Per validator, that's noise. Now weigh that against the base it's competing with. Very roughly, hundreds of millions of SOL are staked earning mid-single-digit APY, which is on the order of tens of millions of SOL/yr in rewards across validators and delegators. A validator's reward scales with SOL price across that whole base. I'm not claiming this burn moves price by any specific amount, but you don't need much, even a small improvement in tokenomics is worth more across that staked base than splitting a few hundred SOL/day, and it's shared instead of fought over. That's the trade: capture a tiny per-validator stream now, or burn it and let any value accrue to the whole staked base. The second is bigger in expectation and it's positive sum. Win for Solana.
Supporting @cavemanloverboy's resource-based base fee SIMD. Charge per cost unit requested, burn 100%. Ties the burn to the work the cluster does, keeps block producers neutral, upside goes to every SOL holder. Win for Solana. github.com/solana-foundat…
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