Chapter 307: Lines and Leeway

When the old test machine was carried into the server room, the side of its chassis still bore the dust of the secondhand electronics market. Su Man had already removed the back panel and slotted two 16MB RAM sticks into the motherboard. The faint scrape of the gold fingers against the slots sounded unusually sharp in the quiet space. She snapped the side panel back on, tightened the screws, and glanced up at the wall clock. 1:40 AM.

“Power it on,” she said.

Lin Chen pressed the power button. The fans groaned to life, then gradually settled into a steady hum. The motherboard's POST lights flickered on in sequence, finally resting on green. He connected the monitor and keyboard, entered the BIOS, and confirmed the memory was recognized correctly. 32MB. For a test rig that had been in service for over six years, this was the physical limit. Hardware doesn't lie. Compute has boundaries, and every architectural design must find its optimal solution within them.

He opened the terminal and began deploying Redis. He didn't chase the latest version, opting instead for the stable branch. In the config file, he manually disabled persistence snapshots and set the memory eviction policy to allkeys-lru. The demo didn't need data written to disk; it just needed the queue to hold. He wrote a lightweight scheduler to take over the data ingress using async coroutines. The logic was straightforward: external requests hit the Redis cache queue first, the scheduler pulled samples at a fixed frequency and fed them into the core desensitization module, then returned the results. Full-volume data was silently redirected to an offline batch pipeline, sparing the demo pipeline's compute.

The code was written with restraint. No showy syntax, just clear boundaries. He planted logging hooks at critical nodes to track queue depth, processing latency, and memory usage. Every line had a circuit-breaker condition baked in. If latency exceeded 200 milliseconds or memory usage breached 85%, the system would automatically degrade and return a preset compliance prompt. No brute-forcing, no hiding. The essence of a tech demo isn't to showcase perfection, but controllability. Capital values certainty; auditors value traceability. He left interfaces for both.

By 3:00 AM, the environment was deployed. Lin Chen imported the simulated data packets and initiated the stress test. The monitoring curves on the screen began to climb. Request volume held at 50 per second, queue depth stabilized around 300. Average latency sat at 92 milliseconds, peaking at 118. The old machine's I/O bottleneck surfaced in the fourth minute, causing brief disk read/write stalls. Lin Chen didn't panic. He adjusted Redis's tcp-backlog parameter, expanded the network buffer, and stretched the sampling interval from one second to 1.2 seconds. The curves smoothed out again.

“Enough headroom,” he said, leaning back into his chair and rubbing his stiff neck.

Su Man sat across from him, holding a printed copy of the demo flowchart. She circled several key nodes with a red pen. “During the Q&A, they'll ask three questions. First, why not use full-volume real-time streaming. Second, how to guarantee data consistency in the cache layer. Third, the scaling cost post-launch.” She paused, setting the pen down. “For the first, cite the phased requirements of compliance auditing. For the second, explain the dual-track mechanism of sampling verification and offline reconciliation. For the third, point to the reserved interfaces in the cloud-native architecture. No dodging, no promising what we can't deliver.”

Lin Chen nodded. He pulled open a drawer, took out his mistake notebook, and flipped to a fresh page. He wrote: Pseudo-real-time architecture. Redis cache layer. Sampling rate 1.2s. Circuit-breaker threshold 85%. The pen tip hovered, then he added another line: Capital looks at efficiency, auditors look at trails. The demo only proves a closed logical loop, not production capacity.

He closed the notebook and fished a painkiller from his pocket. Swallowing it dry, a bitter taste rose in his throat. The numbness in his left foot had already crept up to his calf, his muscles occasionally twitching out of control. He shifted his weight entirely onto the chair's backrest, adjusting his posture to let the blood flow back slightly. The body was an aging server: poor heat dissipation, unstable power supply, but as long as the core processes didn't crash, it could hold out until delivery. From the earthen stove in Qingshi Village to the provincial server room, and now to the office towers of a tier-one city, he had long learned to treat pain as a background daemon process. No interruptions, no extra attention allocated. As long as the main thread kept running, the system wouldn't go down.

By 5:00 AM, all tests had passed. Lin Chen began packing the equipment. Chassis, monitor, Ethernet cables, adapters, backup power supply. Each item was labeled and boxed in order of use. Su Man organized the demo USB drives and paper materials nearby. She printed three copies of the compliance boundary statement, securing them with paper clips. Her movements were crisp, devoid of unnecessary chatter. Neither pleasantries nor pep talks were needed between them. They knew each other's boundaries and understood the weight of this closed-door meeting. Zhao Qiming's people wouldn't listen to technical idealism, and the ethics committee experts wouldn't care about business canvases. They only looked at two things: whether the data could pass review, and whether the logic could run.

“We leave at seven,” Lin Chen said, zipping up his backpack. “If traffic is light, we'll arrive by 8:30. We'll get in half an hour early to familiarize ourselves with the network environment.”

Su Man glanced out the window. The sky was still dark, only the streetlights casting a dim yellow glow through the morning fog. “Alright. I'll bring two sandwiches. We'll eat on the way.”

As the car pulled out of the industrial park, the city hadn't fully woken up. Only scattered freight trucks dotted the elevated highway. Lin Chen sat in the passenger seat, eyes closed. No rehearsed lines ran through his mind, only the topology of the scheduling logic. Data flow, queue states, circuit-breaker conditions, degradation strategies. Every node was clearly visible. He wasn't nervous. Nervousness stems from the unknown, and the unknown had already been broken down into executable steps. All that remained was to press Enter in sequence.

8:20 AM. Ethics Committee Building. Underground parking garage. Lin Chen and Su Man carried the equipment cases toward the elevator. The metal doors reflected their silhouettes. Their shirts were ironed, but the collars showed signs of wear. Su Man's hair was pulled back tightly, her gaze calm. They were like two calibrated instruments, ready to plug into a high-specification system.

The elevator ascended. A soft ding, and the doors slid open. The corridor was carpeted in dark gray, offering excellent sound absorption. Their footsteps were swallowed. At the end lay Conference Room 3. The door was ajar, low voices already drifting out from within.

Lin Chen pushed the door open. Four people were already seated around the long conference table. Zhao Qiming's representatives. Impeccably dressed in suits, laptops open, screens flashing with financial models and competitor comparison charts. Seeing them enter, one of them looked up, his gaze lingering on the equipment cases for two seconds before shifting away. No greetings, just a professional nod.

Lin Chen set the case down beside the reserved interface table. He opened it, pulled out an Ethernet cable, and searched for the wall network panel. It was a standard RJ45 port, but next to it was a yellow label: Internal network isolation. Static IP access only. DHCP disabled.

His fingers paused.

Su Man was already at his side, speaking in a low voice. “Their network topology is closed. Our Redis cache layer relies on dynamic port allocation. If the firewall blocks non-whitelisted traffic, the demo link will drop immediately.”

Lin Chen didn't speak. He crouched down, opened the equipment case, and took out a backup switch and a crossover cable. He ran through network configuration scenarios in his head. Static IPs could be manually bound, but Redis cluster communication required specific open ports. If the committee's network policy strictly blocked unconventional ports, they'd either have to rewrite routing rules on the spot, or abandon the cache layer and switch to a single-machine memory queue. The latter meant latency would spike, severely compromising the demo.

He glanced at the wall clock. 8:35 AM. The closed-door meeting started promptly at 9:00. Twenty-five minutes left for network integration.

“Plug in the crossover cable,” Lin Chen said, standing up, his voice steady. “I'll capture packets to check their policy first. You prepare the single-machine fallback plan. If the ports are locked, switch to the local memory queue and drop the sampling rate to 0.8 seconds. Latency will be higher, but the logic won't break.”

Su Man nodded and turned to dig out the backup drive. Lin Chen inserted the cable into the panel and opened his terminal. The screen lit up, a command-line window popping up. He typed in diagnostic commands and waited for a response. The cursor blinked. Data packets searched for an exit within the closed network.

The final twenty-five minutes before nine o'clock were as quiet as a vacuum. Only the clack of keyboards and the low hum of chassis fans filled the air. Lin Chen stared at the routing table on the screen, his finger hovering over the Enter key. The next step was penetration.