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To put these data rates into
perspective, consider this: 100 Mb/s is more than 10 megabytes in one
second, or 600 megabytes (an entire CD-R image) in one minute. Clearly
very few people see these data rates. However, some experts can get
very high data rates (for example see the Land Speed Records). Why? The biggest strength of the Internet is the way in which the TCP/IP "hourglass" hides the details of the network from the application and vice versa. An unfortunate but direct consequence of the hourglass is that it also hides all flaws everywhere. Network performance debugging (often euphemistically called "TCP tuning") is extremely difficult because nearly all flaws have exactly same symptom: reduced performance. For example insufficient TCP buffer space is indistinguishable from excess packet loss (silently repaired by TCP retransmissions) because both flaws just slow the application, without any specific identifying symptoms. -- PGP Fingerprint: 6695 794A B84E D922 88FB 73CC 6CBD 8036 B3CD 7304 ****************************************************************** We can't become what we need to be by remaining what we are ****************************************************************** |
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