Re: Lossy cogent p2p experiences?

2023-09-04 Thread Masataka Ohta
William Herrin wrote: Hi David, That sounds like normal TCP behavior over a long fat pipe. No, not at all. First, though you explain slow start, it has nothing to do with long fat pipe. Long fat pipe problem is addressed by window scaling (and SACK). As David Hubbard wrote: : I've got a non

Re: Lossy cogent p2p experiences?

2023-09-04 Thread Masataka Ohta
Mark Tinka wrote: ECMP, surely, is a too abstract concept to properly manage/operate simple situations with equal speed multi parallel point to point links. I must have been doing something wrong for the last 25 years. Are you saying you thought a 100G Ethernet link actually consisting of 4

Re: Lossy cogent p2p experiences?

2023-09-04 Thread Nick Hilliard
Masataka Ohta wrote on 04/09/2023 12:04: Are you saying you thought a 100G Ethernet link actually consisting of 4 parallel 25G links, which is an example of "equal speed multi parallel point to point links", were relying on hashing? this is an excellent example of what we're not talking about i

Re: Lossy cogent p2p experiences?

2023-09-04 Thread William Herrin
On Mon, Sep 4, 2023 at 12:13 AM Masataka Ohta wrote: > William Herrin wrote: > > That sounds like normal TCP behavior over a long fat pipe. > > No, not at all. First, though you explain slow start, > it has nothing to do with long fat pipe. Long fat > pipe problem is addressed by window scaling (a

Re: Lossy cogent p2p experiences?

2023-09-04 Thread Masataka Ohta
William Herrin wrote: No, not at all. First, though you explain slow start, it has nothing to do with long fat pipe. Long fat pipe problem is addressed by window scaling (and SACK). So, I've actually studied this in real-world conditions and TCP behaves exactly as I described in my previous em

Re: Lossy cogent p2p experiences?

2023-09-04 Thread William Herrin
On Mon, Sep 4, 2023 at 7:07 AM Masataka Ohta wrote: > William Herrin wrote: > > So, I've actually studied this in real-world conditions and TCP > > behaves exactly as I described in my previous email for exactly the > > reasons I explained. > > Yes of course, which is my point. Your problem is tha

Re: Lossy cogent p2p experiences?

2023-09-04 Thread Masataka Ohta
William Herrin wrote: Well it doesn't show up in long slow pipes because the low transmission speed spaces out the packets, Wrong. That is a phenomenon with slow access and fast backbone, which has nothing to do with this thread. If backbone is as slow as access, there can be no "space out" p