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Increase the duration of the EMA smoothing window (STREAM_LOAD_EMA_INTERVAL_COUNT) #10033

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Merged
alexpyattaev merged 2 commits into from
Jan 16, 2026
Merged

Increase the duration of the EMA smoothing window (STREAM_LOAD_EMA_INTERVAL_COUNT) #10033

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98486db
streamer/TPU: increase STREAM_LOAD_EMA_INTERVAL_COUNT from 10 to 40
stablebits Jan 14, 2026
3b743ee
Merge branch 'master' into increase-stream_load_ema_interval_count
stablebits Jan 16, 2026
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7 changes: 6 additions & 1 deletion streamer/src/nonblocking/stream_throttle.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -23,7 +23,12 @@ pub const STREAM_THROTTLING_INTERVAL_MS: u64 = 100;
pub const STREAM_THROTTLING_INTERVAL: Duration =
Duration::from_millis(STREAM_THROTTLING_INTERVAL_MS);
const STREAM_LOAD_EMA_INTERVAL_MS: u64 = 5;
const STREAM_LOAD_EMA_INTERVAL_COUNT: u64 = 10;
// EMA smoothing window to reduce sensitivity to short-lived load spikes at the start
// of a leader slot. Throttling is only triggered when saturation is sustained.
// The value 40 was chosen based on simulations: at a max target TPS of ~400K,
// it allows the system to absorb a burst of ~50K transactions over ~40 ms
// before throttling activates.
const STREAM_LOAD_EMA_INTERVAL_COUNT: u64 = 40;

const STAKED_THROTTLING_ON_LOAD_THRESHOLD_PERCENT: u64 = 95;

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