Re: [P2PSIP] AD evaluation: draft-ietf-p2psip-diagnostics-17

"Songhaibin (A)" <haibin.song@huawei.com> Thu, 19 November 2015 05:56 UTC

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From: "Songhaibin (A)" <haibin.song@huawei.com>
To: Alissa Cooper <alissa@cooperw.in>
Thread-Topic: [P2PSIP] AD evaluation: draft-ietf-p2psip-diagnostics-17
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Date: Thu, 19 Nov 2015 05:56:39 +0000
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Subject: Re: [P2PSIP] AD evaluation: draft-ietf-p2psip-diagnostics-17
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OK. Sure.

Best Regards!
-Haibin

From: Alissa Cooper [mailto:alissa@cooperw.in]
Sent: Thursday, November 19, 2015 5:42 AM
To: Songhaibin (A)
Cc: p2psip; draft-ietf-p2psip-diagnostics@tools.ietf.org
Subject: Re: [P2PSIP] AD evaluation: draft-ietf-p2psip-diagnostics-17

I should have also said: I think we can continue the discussion on this one point during IETF LC. So once you post the rev with the changes to section 5 I will initiate IETF LC.

Thanks,
Alissa

On Nov 18, 2015, at 1:38 PM, Alissa Cooper <alissa@cooperw.in<mailto:alissa@cooperw.in>> wrote:

Hi Haibin,

On Nov 16, 2015, at 10:44 PM, Songhaibin (A) <haibin.song@huawei.com<mailto:haibin.song@huawei.com>> wrote:

Hi Alissa,

I can accept the second suggestion.

But for the first comment, I’m not sure. IMO, it does not distinguish the bytes sent/rcvd to/from upstream or downstream peer, but only calculate that in total.

Ok. Please answer the questions below, though. The answers are not evident from the draft.

Thanks,
Alissa



Best Regards!
-Haibin

From: Alissa Cooper [mailto:alissa@cooperw.in]
Sent: Thursday, November 12, 2015 7:10 AM
To: Songhaibin (A)
Cc: p2psip; draft-ietf-p2psip-diagnostics@tools.ietf.org<mailto:draft-ietf-p2psip-diagnostics@tools.ietf.org>
Subject: Re: [P2PSIP] AD evaluation: draft-ietf-p2psip-diagnostics-17

Thanks Haibin. This looks good but there are still a few unresolved issues from our earlier mail exchange:

The definitions of EWMA_BYTES_SENT and EWMA_BYTES_RCVD seem problematic.

sent = alpha x sent_present + (1 - alpha) x sent
rcvd = alpha x rcvd_present + (1 - alpha) x rcvd

As written these equations are not right because sent/rcvd appear on both sides. It would be clearer to use last_sent and last_rcvd or some such on the right-hand side of these equations. But this begs some bigger questions:

- Does this place a requirement on all nodes implementing this specification to have to calculate these values every 5 seconds?
- How are the values calculated the first time?
- How was the value of 5 seconds chosen?

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