“超售”是低价 VPS 的常态——商家卖超物理上限，赌你不会满载。轻则便宜够用，重则又卡又慢。怎么判断手里这台超得狠不狠？
什么会被超售
CPU、内存、磁盘 IO、带宽都可能超售（也叫”超开”）。详见 黑话词典 里的”超售”。
怎么判断
- CPU steal time：
top/vmstat里的st值——偏高说明 CPU 被邻居抢占，超售明显。 - 跑分波动：多次 CPU 跑分 忽高忽低 = 受邻居影响大。
- 磁盘掉速：磁盘 IO 在高峰明显变慢。
- 晚高峰对比：白天流畅、晚 8–11 点卡顿，是超售 + 线路拥堵的典型。
应对
退款期内不同时段多测几次，重点测晚高峰；优先选口碑好、不狂超售的商家。便宜得离谱的，多半超得狠。
挑机器趁退款期多测几次；想看在售机型去 库存监控。
Overselling is the norm with low-cost VPS — providers sell more capacity than physically exists, betting that most users won’t hit full load. Light overselling means cheap and usable; heavy overselling means sluggish and unreliable. Here’s how to check how bad yours is.
What Gets Oversold
CPU, RAM, disk I/O, and bandwidth can all be oversold (also called “over-provisioned”). See the Jargon Glossary entry for “overselling.”
How to Check
- CPU steal time: the
stvalue intop/vmstat— if it’s elevated, your CPU cycles are being stolen by neighboring VMs. A clear sign of heavy overselling. - Benchmark variance: run CPU benchmarks multiple times — wild swings mean heavy neighbor interference.
- Disk slowdown: Disk I/O that drops noticeably during peak hours.
- Evening vs. daytime comparison: smooth during the day, choppy between 8–11 PM — a classic sign of overselling combined with network congestion.
What to Do
During the refund window, test at multiple times of day — especially during evening peak hours. Favor providers with a good reputation for not overselling aggressively. If the price looks too good to be true, overselling is probably severe.
Test thoroughly during the refund window. To browse available VPS options, visit the stock monitor.
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