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Network

Stake-Weighted QoS (SWQoS)

A Quality of Service system introduced in Solana that allocates TPU packet bandwidth to staked validators proportionally to their stake weight, preventing unstaked or lightly staked nodes from flooding leaders with transactions at the expense of stake-backed traffic. Validators that have delegated stake can forward transactions and receive preferential access to leader bandwidth, making it economically meaningful to route transactions through staked RPC or validator nodes. SWQoS is a key defense against spam and denial-of-service attacks that plagued Solana during high-traffic periods.

IDstake-weighted-qosAliasSWQoS
Plain meaning

Plain meaning

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A Quality of Service system introduced in Solana that allocates TPU packet bandwidth to staked validators proportionally to their stake weight, preventing unstaked or lightly staked nodes from flooding leaders with transactions at the expense of stake-backed traffic. Validators that have delegated stake can forward transactions and receive preferential access to leader bandwidth, making it economically meaningful to route transactions through staked RPC or validator nodes. SWQoS is a key defense against spam and denial-of-service attacks that plagued Solana during high-traffic periods.

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Stake-Weighted QoS (SWQoS) (stake-weighted-qos)
Category: Network
Definition: A Quality of Service system introduced in Solana that allocates TPU packet bandwidth to staked validators proportionally to their stake weight, preventing unstaked or lightly staked nodes from flooding leaders with transactions at the expense of stake-backed traffic. Validators that have delegated stake can forward transactions and receive preferential access to leader bandwidth, making it economically meaningful to route transactions through staked RPC or validator nodes. SWQoS is a key defense against spam and denial-of-service attacks that plagued Solana during high-traffic periods.
Aliases: SWQoS
Related: Stake, Validator, TPU (Transaction Processing Unit)
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Concept graph

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Branch

Stake

SOL tokens that are delegated to a validator to increase its voting weight and earn staking rewards. Staking is non-custodial—stakers retain ownership of their SOL. Stake activates/deactivates at epoch boundaries with a warmup/cooldown period. Validators with more stake are assigned more leader slots and have proportionally more influence in consensus.

DelegatorStake Account
Open term
Branch

Validator

A node that participates in the Solana network by validating transactions, voting on blocks, and (when selected as leader) producing new blocks. Validators run the Agave, Firedancer, or Jito client software, require significant hardware (128+ GB RAM, high-core CPU, NVMe SSD), and earn rewards from inflation and transaction fees.

Vote AccountLeader Schedule
Open term
Branch

TPU (Transaction Processing Unit)

Transaction Processing Unit—the pipeline within a leader validator that ingests, verifies, and executes transactions. The TPU has stages: fetch (receive packets via QUIC), sigverify (verify Ed25519 signatures), banking (execute against current bank state), and broadcast (shred and send via Turbine). Non-leader validators forward transactions to the current leader's TPU.

TVU (Transaction Validation Unit)Transaction
Open term
Next concepts to explore

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Core Protocol

Stake

SOL tokens that are delegated to a validator to increase its voting weight and earn staking rewards. Staking is non-custodial—stakers retain ownership of their SOL. Stake activates/deactivates at epoch boundaries with a warmup/cooldown period. Validators with more stake are assigned more leader slots and have proportionally more influence in consensus.

Open term
Core Protocol

Validator

A node that participates in the Solana network by validating transactions, voting on blocks, and (when selected as leader) producing new blocks. Validators run the Agave, Firedancer, or Jito client software, require significant hardware (128+ GB RAM, high-core CPU, NVMe SSD), and earn rewards from inflation and transaction fees.

Open term
Core Protocol

TPU (Transaction Processing Unit)

Transaction Processing Unit—the pipeline within a leader validator that ingests, verifies, and executes transactions. The TPU has stages: fetch (receive packets via QUIC), sigverify (verify Ed25519 signatures), banking (execute against current bank state), and broadcast (shred and send via Turbine). Non-leader validators forward transactions to the current leader's TPU.

Open term
Network

Staking Rewards

SOL earned by validators and their delegators each epoch as compensation for participating in consensus and securing the network, funded by protocol inflation rather than solely transaction fees. Rewards are proportional to a validator's active stake and are credited at the end of each epoch to stake accounts automatically; the effective APY depends on the current inflation rate, the percentage of total SOL staked, and the validator's commission rate. Validators set a commission (0–100%) representing the fraction of rewards they keep before passing the remainder to delegators.

Open term
Commonly confused with

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Networkstake-activation

Stake Activation

The process by which newly delegated stake becomes active and begins earning staking rewards. After a user delegates SOL to a validator, the stake enters a warmup phase and becomes fully active at the next epoch boundary (within one epoch, approximately 2-3 days). During activation, the stake does not contribute to the validator's voting weight or earn rewards. This delay prevents rapid stake shifts that could destabilize consensus.

Open term
Networkstake-deactivation

Stake Deactivation

The process of unstaking SOL from a validator, which requires a cooldown period of one epoch before the SOL can be withdrawn. After initiating deactivation, the stake stops earning rewards at the next epoch boundary and enters a cooling-down state. Once the cooldown epoch completes, the SOL becomes available for withdrawal back to the stake authority's wallet. This delay mirrors stake activation and prevents sudden large stake removals from disrupting network stability.

Open term
Related terms

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Core Protocolstake

Stake

SOL tokens that are delegated to a validator to increase its voting weight and earn staking rewards. Staking is non-custodial—stakers retain ownership of their SOL. Stake activates/deactivates at epoch boundaries with a warmup/cooldown period. Validators with more stake are assigned more leader slots and have proportionally more influence in consensus.

Open term
Core Protocolvalidator

Validator

A node that participates in the Solana network by validating transactions, voting on blocks, and (when selected as leader) producing new blocks. Validators run the Agave, Firedancer, or Jito client software, require significant hardware (128+ GB RAM, high-core CPU, NVMe SSD), and earn rewards from inflation and transaction fees.

Open term
Core Protocoltpu

TPU (Transaction Processing Unit)

Transaction Processing Unit—the pipeline within a leader validator that ingests, verifies, and executes transactions. The TPU has stages: fetch (receive packets via QUIC), sigverify (verify Ed25519 signatures), banking (execute against current bank state), and broadcast (shred and send via Turbine). Non-leader validators forward transactions to the current leader's TPU.

Open term
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Network

Mainnet Beta

Solana's primary production cluster where real SOL and real economic activity occur; the "beta" designation reflects the network's ongoing protocol development despite being fully live since March 2020. It uses the same architecture as other clusters but with real validator stakes, live staking rewards, and permanent on-chain state. All production dApps, tokens, and NFTs exist on Mainnet Beta.

Open term
Network

Devnet

A persistent public Solana cluster intended for application development and testing, running the same software version as Mainnet Beta but with no real economic value. Devnet SOL can be freely airdropped via the CLI or faucet APIs, and the ledger may be reset periodically by Solana Labs. Developers use Devnet to test programs and integrations before deploying to Mainnet Beta.

Open term
Network

Testnet

A public Solana cluster used primarily by the Solana core team and validators to test new software releases, performance benchmarks, and network upgrades under real network conditions before they reach Mainnet Beta. Testnet SOL has no monetary value, and the ledger is reset more frequently than Devnet; it is less suitable for application development and more suited for validator operators validating their infrastructure.

Open term
Network

TPS (Transactions Per Second)

The rate at which a Solana cluster processes and commits transactions; Solana's theoretical maximum exceeds 65,000 TPS due to its parallel execution model, though real-world sustained throughput on Mainnet Beta typically ranges from 2,000–5,000 non-vote TPS under normal load. Vote transactions (used for consensus) make up a significant portion of all on-chain activity and are counted separately. High TPS is enabled by Proof of History timestamps, Sealevel parallel execution, and Gulf Stream mempool-less forwarding.

Open term