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Author Topic: 22over7's packet loss on Plusnet  (Read 901 times)

ejs

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Re: 22over7's packet loss on Plusnet
« Reply #15 on: January 22, 2019, 05:49:55 PM »

Are there any graphs of the retransmissions rather than FEC? It would make much more sense if it were the retransmissions causing the increased latency, not FEC.
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22over7

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Re: 22over7's packet loss on Plusnet
« Reply #16 on: January 22, 2019, 08:26:10 PM »

Are there any graphs of the retransmissions rather than FEC? It would make much more sense if it were the retransmissions causing the increased latency, not FEC.

Well, the CRC is handy (attached, I hope), though not very dramatic.  That corrects 1-bit errors doesn't it?
Is there some graph in dslstats that directly shows retransmissions?



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ejs

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Re: 22over7's packet loss on Plusnet
« Reply #17 on: January 22, 2019, 09:06:03 PM »

CRCs are detected errors that have not been corrected.
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j0hn

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Re: 22over7's packet loss on Plusnet
« Reply #18 on: January 23, 2019, 02:08:35 AM »

G.INP tab, rtx_tx
rtx_uc and LEFTERS would also be interesting.

DslStats doesn't save any of these.

The G.INP tab only appears if enabled on the line.
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Plusnet FTTC 80/20 -  ECI now Huawei cab
retx low @ 3dB target SNRM
Zyxel VMG1312-B10A bridged with 1508 MTU + Asus RT-AC68U running Asuswrt-Merlin

22over7

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Re: 22over7's packet loss on Plusnet
« Reply #19 on: January 23, 2019, 02:16:35 PM »

G.INP tab, rtx_tx
rtx_uc and LEFTERS would also be interesting.

DslStats doesn't save any of these.

The G.INP tab only appears if enabled on the line.

I certainly have a G.INP tab. Unfortunately, dslstats has a gap from 20:30->08.50 (for the first time ever!),
making the graphs a bit rubbish. I aim to post them when they fill up again.

In the meantime, here is the "Data Summary"
Code: [Select]
Downstream Upstream
General
rtx_tx          132012362        0               
rtx_c            72139756        0               
rtx_uc          14228            0               
LEFTRS          1467760          0               
minEFTR          79999            0               
errFreeBits      3436881935      0               
Bearer 0
RxQueue          60              0               
TxQueue          20              0               
G.INP Framing    18              0               
G.INP Lookback  20              0               
RRC Bits        0                24             
Interleave depth 16              1               
INP              48.00            0.00           
INPRein          0.00            0.00           
Delay            0                0               
Bearer 1
Interleave depth 3                0               
INP              4.00            0.00           
INPRein          4.00            0.00           
Delay            3                0               

Other data, copied from the bottom of the dslstats window is:
Code: [Select]
 
Modem uptime 155days...   up speed : 18999          up SNRM  : 8.0dB            interleave D/U : 16/1
DSL uptime 155days ...      down speed: 79999        down SNRM : 3.3dB         ES D/U :  0/0.20

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22over7

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Re: 22over7's packet loss on Plusnet
« Reply #20 on: January 24, 2019, 12:02:06 PM »

Concerning retransmissions, my graphs have filled up again.

rtx_tx is attached
LEFTRS isn't because it seems to be almost identical. Likewise rtx_c. (Can this be right??)
rtx_uc isn't because it's just 0 along the x axis!








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j0hn

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Re: 22over7's packet loss on Plusnet
« Reply #21 on: January 24, 2019, 12:16:18 PM »

I forgot to mention that clicking the camera/snapshot button on rtx-tx, rtx-c and LEFTERS all return the same rtx-tx graph.
I don't know if rtx_uc works right as my graph is empty.

rtx_uc is correct.

I just learnt something new and that you can rewind in the graph and take a manual snapshot.
Scrolling back to a single rtx_uc a couple days ago it captures the correct graph.


Auto snapshots don't work on any of the G.INP tabs.

You would need to screenshot the actual DslStats app unfortunately.

edit: corrected info
« Last Edit: January 24, 2019, 01:56:42 PM by j0hn »
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Plusnet FTTC 80/20 -  ECI now Huawei cab
retx low @ 3dB target SNRM
Zyxel VMG1312-B10A bridged with 1508 MTU + Asus RT-AC68U running Asuswrt-Merlin

tiffy

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Re: 22over7's packet loss on Plusnet
« Reply #22 on: January 24, 2019, 12:52:31 PM »

Quote
I forgot to mention that clicking the camera/snapshot button on rtx-tx, rtx-c and LEFTERS all return the same rtx-tx graph.
I don't know if rtx_uc works right as my graph is empty.

For reference, have checked this on my RPi's/DSLStats by taking manually snapshots and comparing:
rtx-tx and rtx-c (snapshots v live DSLStats) do appear to be very similar if not identical, surely that's the objective of re-transmission (G.Inp), all or most of the rtx-tx errors corrected, under perfect conditions graphs identical, should always be difficult to tell the difference.

LEFTRS snapshot definately appears incorrect, looks like rtx-tx & rtx-c DSLStats displays as you have said.

rtx-uc snapshot would appear to produce the correct image by comparison to live DSLStats display.   
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Plusnet 40/10 - DSLStats/RPi - ZyXEL VMG1312-B10A - Huawei Cab - MDWS (sadly gone 12/03/18)

j0hn

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Re: 22over7's packet loss on Plusnet
« Reply #23 on: January 24, 2019, 01:49:55 PM »

Looking again rtx_tx and rtx_c do display the correct manually taken snapshots.
They differ slightly, as they should.

The LEFTERS manual snapshot definitely shows rtx_tx.

I never look at the OHFErr and RSCorr (bearer 1) G.INP tabs so no idea if their manual snapshots are correct.
Looking back at previous Telnet Data captures I have never had any of either, always 0

edited my post above.
« Last Edit: January 24, 2019, 01:57:24 PM by j0hn »
Logged
Plusnet FTTC 80/20 -  ECI now Huawei cab
retx low @ 3dB target SNRM
Zyxel VMG1312-B10A bridged with 1508 MTU + Asus RT-AC68U running Asuswrt-Merlin

22over7

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Re: 22over7's packet loss on Plusnet
« Reply #24 on: January 24, 2019, 02:02:58 PM »

Many thanks for the warnings about the camera icon.

Looking carefully through my dslstats pages (over realVNC, and via the webserver), it seems to be in a right pickle.
Some pages are stuck at 22 Jan, some are up to date. 

My  RSCorr (bearer 1) looks like it contains something (about 3 a minute), but it's 2 days old.

I'll have to investigate my configuration properly. Maybe restart dslstats, even reboot the pi.

Solid information, if any, will be some time ...

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tiffy

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  • Posts: 518
Re: 22over7's packet loss on Plusnet
« Reply #25 on: January 24, 2019, 02:46:14 PM »

Quote
I just learnt something new and that you can rewind in the graph and take a manual snapshot.
Scrolling back to a single rtx_uc a couple days ago it captures the correct graph.

Not aware of this feature either, good spot, thanks for sharing, just hold left mouse button and scroll.
Noted that graph returns to current time at the next auto sample.
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Plusnet 40/10 - DSLStats/RPi - ZyXEL VMG1312-B10A - Huawei Cab - MDWS (sadly gone 12/03/18)
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