Constant zebrad::components::sync::downloads::VERIFICATION_PIPELINE_SCALING_MULTIPLIER

pub const VERIFICATION_PIPELINE_SCALING_MULTIPLIER: usize = 2;

A multiplier used to calculate the extra number of blocks we allow in the verifier, state, and block commit pipelines, on top of the lookahead limit.

The extra number of blocks is calculated using lookahead_limit * VERIFICATION_PIPELINE_SCALING_MULTIPLIER.

This allows the verifier and state queues, and the block commit channel, to hold a few extra tips responses worth of blocks, even if the syncer queue is full. Any unused capacity is shared between both queues.

If this capacity is exceeded, the downloader will tell the syncer to pause new downloads.

Since the syncer queue is limited to the lookahead_limit, the rest of the capacity is reserved for the other queues. There is no reserved capacity for the syncer queue: if the other queues stay full, the syncer will eventually time out and reset.