[−][src]Struct quinn::TransportConfig
Parameters governing the core QUIC state machine
Default values should be suitable for most internet applications. Applications protocols which
forbid remotely-initiated streams should set stream_window_bidi
and stream_window_uni
to
zero.
In some cases, performance or resource requirements can be improved by tuning these values to suit a particular application and/or network connection. In particular, window sizes for streams, stream data, and overall connection data can be tuned for a particular expected round trip time, link capacity, memory availability, and rate of stream creation. Tuning for higher bandwidths and latencies increases worst-case memory consumption, but does not impair performance at lower bandwidths and latencies. The default configuration is tuned for a 100Mbps link with a 100ms round trip time, with remote endpoints opening at most 320 new streams per second.
Fields
stream_window_bidi: u64
Maximum number of bidirectional streams that may be initiated by the peer but not yet accepted locally
Must be nonzero for the peer to open any bidirectional streams.
Any number of streams may be in flight concurrently. However, to ensure predictable resource use, the number of streams which the peer has initiated but which the local application has not yet accepted will be kept below this threshold.
Because it takes at least one round trip for an endpoint to open a new stream and be notified of its peer's flow control updates, this imposes a hard upper bound on the number of streams that may be opened per round-trip. In other words, this should be set to at least the desired number of streams opened per unit time, multiplied by the round trip time.
Note that worst-case memory use is directly proportional to stream_window_bidi * stream_receive_window
, with an upper bound proportional to receive_window
.
stream_window_uni: u64
Variant of stream_window_bidi
affecting unidirectional streams
idle_timeout: u64
Maximum duration of inactivity to accept before timing out the connection (ms).
The actual value used is the minimum of this and the peer's own idle timeout. 0 for none.
stream_receive_window: u64
Maximum number of bytes the peer may transmit without acknowledgement on any one stream before becoming blocked.
This should be set to at least the expected connection latency multiplied by the maximum
desired throughput. Setting this smaller than receive_window
helps ensure that a single
stream doesn't monopolize receive buffers, which may otherwise occur if the application
chooses not to read from a large stream for a time while still requiring data on other
streams.
receive_window: u64
Maximum number of bytes the peer may transmit across all streams of a connection before becoming blocked.
This should be set to at least the expected connection latency multiplied by the maximum desired throughput. Larger values can be useful to allow maximum throughput within a stream while another is blocked.
send_window: u64
Maximum number of bytes to transmit to a peer without acknowledgment
Provides an upper bound on memory when communicating with peers that issue large amounts of flow control credit. Endpoints that wish to handle large numbers of connections robustly should take care to set this low enough to guarantee memory exhaustion does not occur if every connection uses the entire window.
max_tlps: u32
Maximum number of tail loss probes before an RTO fires.
packet_threshold: u32
Maximum reordering in packet number space before FACK style loss detection considers a packet lost.
time_threshold: u16
Maximum reordering in time space before time based loss detection considers a packet lost. 0.16 format, added to 1
delayed_ack_timeout: u64
The length of the peer’s delayed ack timer (μs).
initial_rtt: u64
The RTT used before an RTT sample is taken (μs)
max_datagram_size: u64
The sender’s maximum UDP payload size. Does not include UDP or IP overhead.
Used for calculating initial and minimum congestion windows.
initial_window: u64
Default limit on the amount of outstanding data in bytes.
Recommended value: min(10 * max_datagram_size, max(2 * max_datagram_size, 14720))
minimum_window: u64
Default minimum congestion window.
Recommended value: 2 * max_datagram_size
.
loss_reduction_factor: u16
Reduction in congestion window when a new loss event is detected. 0.16 format
persistent_congestion_threshold: u32
Number of consecutive PTOs after which network is considered to be experiencing persistent congestion.
keep_alive_interval: u32
Number of milliseconds of inactivity before sending a keep-alive packet
Keep-alive packets prevent an inactive but otherwise healthy connection from timing out.
0 to disable, which is the default. Only one side of any given connection needs keep-alive enabled for the connection to be preserved. Must be set lower than the idle_timeout of both peers to be effective.
crypto_buffer_size: usize
Maximum quantity of out-of-order crypto layer data to buffer
allow_spin: bool
Whether the implementation is permitted to set the spin bit on this connection
This allows passive observers to easily judge the round trip time of a connection, which can be useful for network administration but sacrifices a small amount of privacy.
datagram_receive_buffer_size: Option<usize>
Maximum number of incoming application datagram bytes to buffer, or None to disable datagrams
The peer is forbidden to send single datagrams larger than this size. If the aggregate size of all datagrams that have been received from the peer but not consumed by the application exceeds this value, old datagrams are dropped until it is no longer exceeded.
datagram_send_buffer_size: usize
Maximum number of outgoing application datagram bytes to buffer
While datagrams are sent ASAP, it is possible for an application to generate data faster than the link, or even the underlying hardware, can transmit them. This limits the amount of memory that may be consumed in that case.
Trait Implementations
impl Debug for TransportConfig
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impl Default for TransportConfig
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fn default() -> TransportConfig
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Auto Trait Implementations
impl RefUnwindSafe for TransportConfig
impl Send for TransportConfig
impl Sync for TransportConfig
impl Unpin for TransportConfig
impl UnwindSafe for TransportConfig
Blanket Implementations
impl<T> Any for T where
T: 'static + ?Sized,
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T: 'static + ?Sized,
impl<T> Borrow<T> for T where
T: ?Sized,
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T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
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T: ?Sized,
fn borrow_mut(&mut self) -> &mut T
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impl<T> From<T> for T
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impl<T, U> Into<U> for T where
U: From<T>,
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U: From<T>,
impl<T, U> TryFrom<U> for T where
U: Into<T>,
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U: Into<T>,
type Error = Infallible
The type returned in the event of a conversion error.
fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>
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impl<T, U> TryInto<U> for T where
U: TryFrom<T>,
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U: TryFrom<T>,
type Error = <U as TryFrom<T>>::Error
The type returned in the event of a conversion error.
fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>
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impl<V, T> VZip<V> for T where
V: MultiLane<T>,
V: MultiLane<T>,