Bufferbloat: Dark Buffers in the Internet (ACM Queue) [LWN.net]

Bufferbloat: Dark Buffers in the Internet (ACM Queue)

Posted Dec 7, 2011 12:36 UTC (Wed) by dlang (✭ supporter ✭, #313)
In reply to: Bufferbloat: Dark Buffers in the Internet (ACM Queue) by mtaht
Parent article: Bufferbloat: Dark Buffers in the Internet (ACM Queue)

If the buffer size is root(flows) * bandwidth * delay and the bandwidth is 1/1000 of what it was before (with all else being equal) doesn't that make the required buffer size 1/1000 as well?

I'm missing something here, but I don't see how the sqrt piece matters when we are talking about the bandwidth changing

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Bufferbloat: Dark Buffers in the Internet (ACM Queue)

Posted Dec 7, 2011 13:04 UTC (Wed) by mtaht (✭ supporter ✭, #11087) [Link]

In your example, you missed the delay component.

'All else' is not equal in your example.

And I was mentally going from the 1Mbit link UP to the 1000Mbit link, where
delay factors in a lot. Your typical 1Mbit internet link can have an inherent next-hop delay of 1-60ms on wired technologies which is a significant component of that portion of the BDP. Wireless is far worse,
of course.

And I was still kicking myself about the sqrt part from my mis-spent weekend. And I conflated the three together in trying to explain myself.

I really shouldn't post stuff before my third cup of coffee. I may just delete what I tried to post and start over. If there is a way to explain it better (if you can explain it back to me!) I'm either going to make another pot of coffee or go to bed and pull a pillow over my head. Or both.