Shulou(Shulou.com)06/01 Report--

There is really no time, so this article is very short!

At present, OC-768 is a normal link, not to mention OC-192!

For routers, exit queuing requires N acceleration ratio. Take OC-192 as an example, 4-interface routers need the bandwidth of 40Gbps to meet the queuing demand. It is raining heavily outside, so you can't let people queue outside. And this is a huge challenge, so all switch to the input queue, but the challenge is pushed to the software, that is, the scheduling algorithm! At present, there is nothing better, only space for time, but with the further improvement of bandwidth (too much APP, mobile Internet era, Internet of things generation, this is inevitable, in the past, your family only has people surfing the Internet, but now your electric fan and microwave oven also have to surf the Internet.), there will always be a unit of storage efficiency is not enough, so no matter how large the space can not get back time.

In fact, taking the OC-768 link as an example, the RTT of a TCP takes about 0.25s, so it is necessary to buffer at least * 0.25g of OC-768 bandwidth, that is, 10G of data and 10G of data per second. Even DDR4 is very difficult. Besides, large-scale caching mechanism, after all, it is not appropriate to use DDR. This is a challenge to storage technology. Explode!

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