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Lease relay buffers from a shared pool (#3081)

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A connection's two 16 KiB relay buffers lived inline in its slot, so every
connection that had moved a byte kept those pages resident even while idle.
They now come from one ObjectPool with two buffers per connection slot: a
connection leases a buffer while bytes wait in it and returns it when it
drains, and the LIFO free list hands the same warm pages to the next busy
connection. The pool covers every direction of every slot, so a lease never
fails and reads never wait on it.

With 1,000 idle connections, ss-server drops from 35.4 to 27.2 KiB per
connection on Linux (C: 26.2) and from 73.9 to 42.2 KiB on macOS. The slot
shrinks from 104 to 68 KiB.

FixedBuffer gains a user-provided constructor so that value-initialising one
(a pool lease, a variant alternative) no longer zero-fills its storage.
This commit is contained in:
Max Lv
2026-10-15 10:19:05 +08:00
committed by GitHub
parent ee7539155d
commit db861130d7
5 changed files with 125 additions and 25 deletions
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docs/cpp-core.md
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@@ -97,7 +97,7 @@ Mbed TLS lacking it, `mbedtls_gcm_setkey` may still allocate.
| Setting | Default | Pool |
|---|---|---|
| `--max-connections` / `max_connections` | 1024 | TCP connections, about 104 KiB each |
| `--max-connections` / `max_connections` | 1024 | TCP connections: a 68 KiB slot each, plus two 16 KiB relay buffers leased from a shared pool while data is in flight |
| `--max-udp-sessions` / `max_udp_sessions` | 256 (ss-server 512) | UDP associations; the least recently used is dropped when full |
| `--max-dns-queries` / `max_dns_queries` | the connection limit (ss-server +64) | DNS lookups in flight |