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Alexey Dolotov
026ec74dfd
- Use sync.Pool for relay buffers instead of stack-allocated arrays. A [16379]byte on the goroutine stack forces Go to grow it to 32KB (next power of two). Pooled buffers keep goroutine stacks small. - Same fix for doppelganger write buffer ([16384]byte in conn.start). - Replace idle goroutines with context.AfterFunc in proxy.ServeConn and relay.Relay. These goroutines existed only to wait on ctx.Done() and close connections. AfterFunc achieves the same without allocating a goroutine until the context is actually cancelled. Net effect: at 3000 concurrent connections on a 1-vCPU/961MB VPS, the unmodified binary drops 246 connections and falls to 10 MB/s. With these changes: zero failures, 63 MB/s, 31% lower RSS. Closes #412