高带宽与低延迟？
高持续带宽比低延迟更重要。我们的大多数目标应用程序都非常重视高速批量处理数据，而很少有应用程序对单个读取或写入的响应时间有严格的要求。
拥有高持续带宽难道不会自动保证低延迟吗？
High sustained bandwidth is more important than low latency. Most of our target applications place a premium on processing data in bulk at a high rate, while few have stringent response time requirements for an individual read or write.
Wouldn't having a high sustained bandwidth automatically guarantee low latency?
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未必。例如，一架装满备份磁带的飞机从大陆的一侧飞往另一侧，其带宽非常高，因为它可以先于任何现有网络获取那里的所有数据。然而，它的延迟非常高，因为每条数据都需要很长时间才能到达那里。
当您有大量数据要发送/接收并且实际上不需要实时时（例如将大量数据传输到异地备份）时，带宽非常重要。 （您并不真正关心数据到达的顺序或另一方响应的速度，您只需要所有数据到达那里。）
当时间对于数据如何/何时到达至关重要时，延迟就很重要，例如在线游戏或视频流。 （只要“当前”数据包“立即”到达，您就不会关心可能丢失了多少数据。）
义务：“永远不要低估一辆装满磁带的旅行车在高速公路上疾驰的带宽。” —Tanenbaum, Andrew S. (1996)
（Google 第一个点击此引用的是 Sneakernet 的 Wikipedia 页面，该页面是另一个高带宽和高延迟的绝佳例子。）
（或者，就我而言，大约一个月前，一辆在高速公路上携带 2 TB 硬盘的 Scion 的带宽。我在两天内传输了 15 TB 的数据。对消费者来说不错- 级硬件。）
Not necessarily. For example, an airplane filled with backup tapes flying from one side of the continent to the other has very high bandwidth because it gets all of the data there before any existing network could. However, it has very high latency because each individual piece of data took a very long time to get there.
Bandwidth is important when you have a lot of data to send/receive and it doesn't really need to be real-time, such as transferring large amounts of data to an off-site backup. (You don't really care in what order the data arrives or how quickly the other side can respond, you just need all the data to get there.)
Latency is important when timing is critical in how/when the data arrives, such as online gaming or video streaming. (You don't care how much data may have been dropped as long as the "current" packet is arriving "right now.")
Obligatory: "Never underestimate the bandwidth of a station wagon full of tapes hurtling down the highway." —Tanenbaum, Andrew S. (1996)
(The first Google hit on this quote was the Wikipedia page for Sneakernet, which is another excellent example of high bandwidth and high latency.)
(Or, in my case about a month ago, the bandwidth of a Scion carrying 2 TB hard drives down the highway. I transferred 15 TB of data in two days. Not bad for consumer-grade hardware.)