const internal/poll.maxSpliceSize

3 uses

	internal/poll (current package)
		splice_linux.go#L25: 	maxSpliceSize = 1 << 20
		splice_linux.go#L41: 		max := maxSpliceSize
		splice_linux.go#L235: 	unix.Fcntl(fds[0], syscall.F_SETPIPE_SZ, maxSpliceSize)