Session delegates frontend login to FrontendLogin, first-backend dialing to
InitialRouter and the whole transfer state machine to TransferCoordinator
behind the TransferHost port. Per-frame PLAY handlers move to session.play and
dialing helpers to session.channel. Relay hot path is unchanged.
Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
The PLAY relay called writeAndFlush for every decoded frame. With
TCP_NODELAY, a socket read holding many small packets (a typical server
tick) cost one flush, write syscall and TCP segment per frame. Write each
frame and flush the peer on channelReadComplete. A per-batch event-loop
task flushes frames forwarded outside a socket read, such as delayed tab
completion. Paused-frame replay keeps writeAndFlush.
ProxySessionBenchmark gains --burst plus proxy I/O CPU and TCP segment
counters. On a 4 vCPU Linux container with 32 x 33-byte frames per write,
TCP segments/frame fell from 1.379 to 0.117 and proxy I/O CPU/frame from
4079 to 1827 ns (medians of six paired phases). The existing 1 KiB window
1 and 16 workloads showed no regression.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01KcCN2hYyqmU22X2Xfg1nwe
layue13andClaude Opus 5.5