44b11154ca
Current broadcast code is computing stakes for each slot before sending them down the channel: https://github.com/solana-labs/solana/blob/049fb0417/core/src/broadcast_stage/standard_broadcast_run.rs#L208-L228 https://github.com/solana-labs/solana/blob/0cf52e206/core/src/broadcast_stage.rs#L342-L349 Since the stakes are a function of epoch the slot belongs to (and so does not necessarily change from one slot to another), forwarding the slot itself would allow better caching downstream. In addition we need to invalidate the cache if the epoch changes (which the current code does not do), and that requires to know which slot (and so epoch) current broadcasted shreds belong to: https://github.com/solana-labs/solana/blob/19bd30262/core/src/broadcast_stage/standard_broadcast_run.rs#L332-L344