Linked by Amjith Ramanujam on Wed 23rd Jul 2008 16:34 UTC, submitted by LinucksGirl
Linux In this article, learn how to be a more productive Linux systems administrator. These 10 essential tricks will lead you on your way to being one powerful Linux systems administrator. Learn about SSH tunnels, VNC, password recovery, console spying, and more. Examples accompany each trick, so you can duplicate them on your own systems.
Permalink for comment 324270
To read all comments associated with this story, please click here.
Does this guy actually know anything?
by tadams on Wed 23rd Jul 2008 23:41 UTC
tadams
Member since:
2008-07-23

"You'll see output in both screens telling you what the speed is. On a normal server with a Gigabit Ethernet adapter, you will probably see about 112MBps. This is normal as bandwidth is lost in the TCP stack and physical cables. By connecting two servers back-to-back, each with two bonded Ethernet cards, I got about 220MBps."

1 Gigbit per second is either 1073741824 bits per second or 1000000000 bits per second. Depending on the definition (binary or standard). To get bytes divide by 8 (bits per byte). 134,217,728 or ~134 megabytes per second. This doesn't include the overhead of the TCP/IP stack. (Many people divide a rate by 10 to get an approximate value AFTER overhead; which would give you 107 megabytes per second.) You will see his number, which is somehow magically low due to losses in cables is right on the money.

My point, you don't lose bandwidth in the cables unless they are causing errors. Bandwidth is also NOT lost in TCP/IP, or other, stacks. It is simply consumed for necessary overhead.

This guy wouldn't work for me making such stupid comments.

Reply Score: 0