Rayhaan JaufeerallyandClaude Fable 5.1
eab891567b
bgp_rib::table::RibTable holds every route from every peer and the best
one for each prefix. It is not used by the server yet; this adds it with
its tests and benchmarks.
- Organised by prefix. A row holds the prefix's routes from all peers in
one array; choosing again after a change reads that row and nothing else.
- A route is sixteen bytes: a pointer to its attribute set and one word
holding the peer and the first three steps of selection (LOCAL_PREF, AS
path length, ORIGIN) as a single number. That number alone settles most
changes; a tie goes on to MED, compared only within a neighbouring AS
and in a way that does not depend on arrival order, and the tie-breaks.
- Attribute sets are stored once, in wire form, with what selection needs
from them worked out when they are stored.
- Sharded by hash of the prefix, a lock per shard. A session applies its
own UPDATEs; there is no queue or owning thread in front of the table.
- Readers take one shard at a time for reading and look at rows in place.
Route selection is checked against a plain implementation with no
shortcuts by a property test over random announcements, withdrawals and
session flaps, for both the chosen route and the count of changes.
On a RIPE RIS dump from AMS-IX (148 peers, 39.3 million routes), against
the Adj-RIB-In actor, which does no selection:
actor table
memory 11.0 GiB 1.8 GiB (279 -> 48 bytes a route)
load, 1 thread 10.2 s 12.3 s
load, 12 threads (no gain) 2.1 s (19 million routes a second)
read every route 1.6 s, copying 8 GiB, table stopped
0.2 s, in place, table running
The benchmark crate counts memory only with --features count-memory: the
counters are shared between threads and distort the timings.
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
26 lines
530 B
TOML
26 lines
530 B
TOML
[package]
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name = "bgp-rib"
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authors.workspace = true
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edition.workspace = true
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homepage.workspace = true
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license.workspace = true
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repository.workspace = true
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version.workspace = true
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[dependencies]
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bgp-packet.workspace = true
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bgp-primitives.workspace = true
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bytes.workspace = true
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foldhash.workspace = true
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hashbrown.workspace = true
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serde.workspace = true
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thiserror.workspace = true
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tokio = { workspace = true, features = ["full"] }
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tracing.workspace = true
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[dev-dependencies]
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proptest.workspace = true
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[lints]
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workspace = true
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