[Nfd-dev] Help needed with ASF measurement
Lan Wang (lanwang)
lanwang at memphis.edu
Mon Oct 24 11:21:49 PDT 2016
Junxiao,
Thank you very much for the quick feedback.
Ashlesh: have you found anything suspicious?
Lan
On Oct 24, 2016, at 11:00 AM, Junxiao Shi <shijunxiao at email.arizona.edu<mailto:shijunxiao at email.arizona.edu>> wrote:
Hi Ashlesh
This is probably a forwarding pipelines bug, but I won't have time to diagnose this until at least Thursday.
Things to look at:
1. Find every code line that updates last renewed field.
2. Find which forwarding pipelines calls the function that updates last renewed field.
3. Determine if there's a code path that generates an out record without updating last renewed field.
Yours, Junxiao
On Oct 24, 2016 08:52, "Ashlesh Gawande (agawande)" <agawande at memphis.edu<mailto:agawande at memphis.edu>> wrote:
Hi Junxiao
I am testing ASF in Mini-NDN.
The following line calculates the steady RTT by subtracting outRecord->getLastRenewed()
from time::steady_clock::now()
https://github.com/named-data/NFD/blob/master/daemon/fw/asf-measurements.cpp#L117
(which is called from beforeSatisfyInterest https://github.com/named-data/NFD/blob/master/daemon/fw/asf-strategy.cpp#L115)
Sometimes the value of this steadyRTT is huge (ex: 200000 seconds) or negative.
This makes ASF change faces to a higher RTT face.
So what could be the reason that this happening? I see much better and expected results if I ignore these high/negative values.
(I see that https://github.com/named-data/NFD/blob/master/daemon/table/pit-face-record.cpp#L34
initializes getLastRenewed to time::steady_clock::TimePoint::min(). So maybe for some reason getLastRenewed does not get updated?)
Thanks
Ashlesh
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