loadtest

var (
	// UploadWindow bounds the bytes ONE session may buffer: chunks held
	// ahead of the frontier plus the chunks being read. A frontier chunk is
	// always admitted (held chunks are evicted for it if need be, and re-sent by
	// the client, which got 202 and not 200 for them), so the window can never
	// deadlock a session.
	//
	// 64 MiB is headroom, not an appetite: the striped client sizes its live
	// chunk buffers as min(its own 16 MiB memory cap / 4 MiB chunk, window/chunk
	// - 2), so a 16 MiB window left it two live chunks — one per tunnel, with an
	// ack round trip between them — and cost ~20% of single-upload throughput.
	// At 64 MiB the client's memory cap (4 chunks) binds again, and inflight
	// plus held never comes near the window.
	UploadWindow int64 = 64 << 20
	// UploadSessions caps concurrent sessions, so the sink's ceiling is
	// window x sessions (256 MiB by default) on an exit that has been OOM-killed
	// for less (#4252).
	UploadSessions = 4
	// UploadIdle expires a session that stopped making progress; its
	// buffers go with it.
	UploadIdle = 2 * time.Minute
)