数据包在北大西洋上/下传输的理论最短往返时间?
我正在为低延迟应用程序进行一些性能调整和容量规划,并有以下问题:
在伦敦的主机和伦敦的主机之间发送的数据包的理论最小往返时间是多少?纽约通过光纤连接?
I'm doing some performance tuning and capacity planning for a low-latency application and have the following question:
What is the theoretical minimum round-trip time for a packet sent between a host in London and one in New York connected via optical fiber?
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我相信光纤的折射率约为 1.5,互联网上报道从纽约到伦敦的距离约为 5600 公里,因此理论最小单程为
5600 公里/(c/1.5) =~ 28 毫秒.往返时间是该时间的两倍,即 56 毫秒。
由您来完成估计通过路由器等的延迟的实际工作。
PS电缆可能不是直的:p
编辑:关于光纤的维基百科文章的一些内容 几乎包含所有这些信息。
I believe the index of refraction of fiber is around 1.5, and the internet reports it's around 5600 km from NY to London, so the theoretical minimum one-way is
5600 km / (c/1.5) =~ 28 ms
. Round-trip is double that, 56 ms.Up to you to do the real work of estimating latency through your routers and all.
P.S. The cables might not be straight :p
Edit: A bit of the wikipedia article on optical fiber pretty much contains all this information.
问问 Hibernia 就知道了,他们目前的速度是 72 毫秒,预计到 2012 年中期将达到 60 毫秒。
http://www. a-teamgroup.com/article/andrews-blog-laying-cable-and-the-low-latency-gauntlet/
Just ask Hibernia, they currently are at 72ms and presently looking at 60ms by mid-2012.
http://www.a-teamgroup.com/article/andrews-blog-laying-cable-and-the-low-latency-gauntlet/