* Re: [Flent-users] [tohojo/flent] flent: extremely high ping times on macOS (#178)
2019-09-06 11:57 [Flent-users] [tohojo/flent] flent: extremely high ping times on macOS (#178) Rich Brown
@ 2019-09-06 14:49 ` Dave Täht
2019-09-06 15:15 ` Rich Brown
` (15 subsequent siblings)
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From: Dave Täht @ 2019-09-06 14:49 UTC (permalink / raw)
To: tohojo/flent; +Cc: Subscribed
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Rich Brown <notifications@github.com> writes:
> Using Flent 1.3.0 with fping 4.2 on macOS 10.2.6:
>
> I see high ping times (>100 msec in the following report) despite the
> fact that actual ping times (measured by fping during the flent test)
> are 20-30 msec, and none higher that 47 msec. (I am on 7mbps/768kbps
> DSL, so the 6.95mbps seems accurate.)
>
> Here is the data file.
> tcp_ndown-2019-09-06T074544.888052.Rich_Test.flent.gz
>
> What other information could I provide? Thanks.
>
> bash-3.2$ flent -x -H flent-fremont.bufferbloat.net -t "Rich_Test" --te=download_streams=4 tcp_ndown
> Started Flent 1.3.0 using Python 2.7.15.
> Starting tcp_ndown test. Expected run time: 70 seconds.
> Data file written to ./tcp_ndown-2019-09-06T074544.888052.Rich_Test.flent.gz.
>
> Summary of tcp_ndown test run from 2019-09-06 11:45:44.888052
> Title: 'Rich_Test'
>
> avg median # data pts
> Ping (ms) ICMP : 104.03 105.00 ms 350
I have seen this statistic be wildly wrong in the summary but correct in
the graph.
> TCP download avg : 1.71 1.74 Mbits/s 300
> TCP download sum : 6.83 6.95 Mbits/s 300
> TCP download::1 : 1.55 1.56 Mbits/s 281
> TCP download::2 : 1.85 1.83 Mbits/s 282
> TCP download::3 : 1.53 1.54 Mbits/s 282
> TCP download::4 : 1.91 1.90 Mbits/s 287
> bash-3.2$
> bash-3.2$ fping --version
> fping: Version 4.2
> fping: comments to david@schweikert.ch
>
> bash-3.2$ fping -c 1000 gstatic.com -D
> [1567770338.594778] gstatic.com : [0], 84 bytes, 20.7 ms (20.7 avg, 0% loss)
> [1567770339.600662] gstatic.com : [1], 84 bytes, 21.7 ms (21.2 avg, 0% loss)
> [1567770340.602339] gstatic.com : [2], 84 bytes, 21.5 ms (21.3 avg, 0% loss)
> [1567770341.605205] gstatic.com : [3], 84 bytes, 22.2 ms (21.5 avg, 0% loss)
> [1567770342.608899] gstatic.com : [4], 84 bytes, 21.0 ms (21.4 avg, 0% loss)
> [1567770343.613397] gstatic.com : [5], 84 bytes, 21.4 ms (21.4 avg, 0% loss)
> [1567770344.618612] gstatic.com : [6], 84 bytes, 21.5 ms (21.4 avg, 0% loss)
> [1567770345.618789] gstatic.com : [7], 84 bytes, 20.8 ms (21.3 avg, 0% loss)
> ...
>
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* Re: [Flent-users] [tohojo/flent] flent: extremely high ping times on macOS (#178)
2019-09-06 11:57 [Flent-users] [tohojo/flent] flent: extremely high ping times on macOS (#178) Rich Brown
2019-09-06 14:49 ` Dave Täht
@ 2019-09-06 15:15 ` Rich Brown
2019-09-06 17:58 ` Toke Høiland-Jørgensen
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From: Rich Brown @ 2019-09-06 15:15 UTC (permalink / raw)
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Hmmm, not this time... What else could I check?
![image](https://user-images.githubusercontent.com/1094930/64439228-7e5a5880-d097-11e9-9068-1f80fd634be7.png)
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* Re: [Flent-users] [tohojo/flent] flent: extremely high ping times on macOS (#178)
2019-09-06 11:57 [Flent-users] [tohojo/flent] flent: extremely high ping times on macOS (#178) Rich Brown
2019-09-06 14:49 ` Dave Täht
2019-09-06 15:15 ` Rich Brown
@ 2019-09-06 17:58 ` Toke Høiland-Jørgensen
2019-09-06 18:58 ` Rich Brown
` (13 subsequent siblings)
16 siblings, 0 replies; 18+ messages in thread
From: Toke Høiland-Jørgensen @ 2019-09-06 17:58 UTC (permalink / raw)
To: tohojo/flent; +Cc: Subscribed
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Rich Brown <notifications@github.com> writes:
> Hmmm, not this time... What else could I check?
>
> ![image](https://user-images.githubusercontent.com/1094930/64439228-7e5a5880-d097-11e9-9068-1f80fd634be7.png)
If you turn on debug logging during the test run (-L option), that log
will include the actual output of the ping tool being used, which you
can then compare to the graphs...
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* Re: [Flent-users] [tohojo/flent] flent: extremely high ping times on macOS (#178)
2019-09-06 11:57 [Flent-users] [tohojo/flent] flent: extremely high ping times on macOS (#178) Rich Brown
` (2 preceding siblings ...)
2019-09-06 17:58 ` Toke Høiland-Jørgensen
@ 2019-09-06 18:58 ` Rich Brown
2019-09-06 22:46 ` Toke Høiland-Jørgensen
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From: Rich Brown @ 2019-09-06 18:58 UTC (permalink / raw)
To: tohojo/flent; +Cc: Subscribed
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Here's the log file: https://pastebin.com/aBXCgjD1
NB I'll be away for the weekend, so won't follow up for a while. Thanks.
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* Re: [Flent-users] [tohojo/flent] flent: extremely high ping times on macOS (#178)
2019-09-06 11:57 [Flent-users] [tohojo/flent] flent: extremely high ping times on macOS (#178) Rich Brown
` (3 preceding siblings ...)
2019-09-06 18:58 ` Rich Brown
@ 2019-09-06 22:46 ` Toke Høiland-Jørgensen
2019-09-08 22:33 ` Rich Brown
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From: Toke Høiland-Jørgensen @ 2019-09-06 22:46 UTC (permalink / raw)
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Rich Brown <notifications@github.com> writes:
> Here's the log file: https://pastebin.com/aBXCgjD1
>
> NB I'll be away for the weekend, so won't follow up for a while.
> Thanks.
Looks like those are the actual ping times reported by fping:
[1567795827.309700] flent-fremont.bufferbloat.net : [175], 84 bytes, 95.5 ms (104 avg, 0% loss)
[1567795827.514875] flent-fremont.bufferbloat.net : [176], 84 bytes, 99.3 ms (104 avg, 0% loss)
[1567795827.715928] flent-fremont.bufferbloat.net : [177], 84 bytes, 100 ms (104 avg, 0% loss)
[1567795827.925782] flent-fremont.bufferbloat.net : [178], 84 bytes, 108 ms (104 avg, 0% loss)
[1567795828.129695] flent-fremont.bufferbloat.net : [179], 84 bytes, 111 ms (104 avg, 0% loss)
[1567795828.334842] flent-fremont.bufferbloat.net : [180], 84 bytes, 116 ms (104 avg, 0% loss)
[1567795828.528711] flent-fremont.bufferbloat.net : [181], 84 bytes, 110 ms (104 avg, 0% loss)
[1567795828.735846] flent-fremont.bufferbloat.net : [182], 84 bytes, 114 ms (105 avg, 0% loss)
[1567795828.918825] flent-fremont.bufferbloat.net : [183], 84 bytes, 96.8 ms (104 avg, 0% loss)
[1567795829.129416] flent-fremont.bufferbloat.net : [184], 84 bytes, 103 ms (104 avg, 0% loss)
-Toke
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* Re: [Flent-users] [tohojo/flent] flent: extremely high ping times on macOS (#178)
2019-09-06 11:57 [Flent-users] [tohojo/flent] flent: extremely high ping times on macOS (#178) Rich Brown
` (4 preceding siblings ...)
2019-09-06 22:46 ` Toke Høiland-Jørgensen
@ 2019-09-08 22:33 ` Rich Brown
2019-09-08 23:04 ` Toke Høiland-Jørgensen
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From: Rich Brown @ 2019-09-08 22:33 UTC (permalink / raw)
To: tohojo/flent; +Cc: Subscribed
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Ahah! I see the difference. I was testing against `gstatic.com` with Terminal; Flent was testing against `flent-fremont.bufferbloat.net`
This seems a pretty big disparity between test results. Is there an option to tell Flent to ping a more local host? Thanks.
```
bash-3.2$ fping -c 1000 gstatic.com -D
[1567981240.102843] gstatic.com : [0], 84 bytes, 20.6 ms (20.6 avg, 0% loss)
[1567981241.103361] gstatic.com : [1], 84 bytes, 20.3 ms (20.4 avg, 0% loss)
[1567981242.107343] gstatic.com : [2], 84 bytes, 20.4 ms (20.4 avg, 0% loss)
^C
gstatic.com : xmt/rcv/%loss = 3/3/0%, min/avg/max = 20.3/20.4/20.6
bash-3.2$ fping -c 1000 flent-fremont.bufferbloat.net -D
[1567981266.195681] flent-fremont.bufferbloat.net : [0], 84 bytes, 92.9 ms (92.9 avg, 0% loss)
[1567981267.197573] flent-fremont.bufferbloat.net : [1], 84 bytes, 92.5 ms (92.7 avg, 0% loss)
[1567981268.199153] flent-fremont.bufferbloat.net : [2], 84 bytes, 92.9 ms (92.8 avg, 0% loss)
[1567981269.200396] flent-fremont.bufferbloat.net : [3], 84 bytes, 92.9 ms (92.8 avg, 0% loss)
...
```
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* Re: [Flent-users] [tohojo/flent] flent: extremely high ping times on macOS (#178)
2019-09-06 11:57 [Flent-users] [tohojo/flent] flent: extremely high ping times on macOS (#178) Rich Brown
` (5 preceding siblings ...)
2019-09-08 22:33 ` Rich Brown
@ 2019-09-08 23:04 ` Toke Høiland-Jørgensen
2019-09-09 0:06 ` Rich Brown
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From: Toke Høiland-Jørgensen @ 2019-09-08 23:04 UTC (permalink / raw)
To: tohojo/flent; +Cc: Subscribed
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Rich Brown <notifications@github.com> writes:
> Ahah! I see the difference. I was testing against `gstatic.com` with Terminal; Flent was testing against `flent-fremont.bufferbloat.net`
>
> This seems a pretty big disparity between test results. Is there an
> option to tell Flent to ping a more local host? Thanks.
You cannot (easily) override the existing ping host, but you can add an
additional one with --test-parameter ping_hosts=gstatic.com
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* Re: [Flent-users] [tohojo/flent] flent: extremely high ping times on macOS (#178)
2019-09-06 11:57 [Flent-users] [tohojo/flent] flent: extremely high ping times on macOS (#178) Rich Brown
` (6 preceding siblings ...)
2019-09-08 23:04 ` Toke Høiland-Jørgensen
@ 2019-09-09 0:06 ` Rich Brown
2019-09-09 12:25 ` Toke Høiland-Jørgensen
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From: Rich Brown @ 2019-09-09 0:06 UTC (permalink / raw)
To: tohojo/flent; +Cc: Subscribed
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Hmmm... The `--test-parameter=ping_hosts=gstatic.com` information appears in the command-line summary but not in the charts. Is this correct?
If so, the charts display significantly different latency depending on which -H host gets used. The Terminal display (bottom) shows fairly consistent ping times and transfer rate measurements using either of the two hosts.
This raises two questions:
1. Could flent charts use the `--test-parameter=ping_hosts=...` instead of values from the -H host?
2. Why is there a discrepency between the `--test-parameter=ping_hosts=...` reading (showing 30-38 msec in my tests) and a separate, concurrent fping test (see original post, where it was running 20-22 msec)?
Thanks.
**Test to flent-fremont.bufferbloat.net gives latency > 100 msec:**
<img width="586" alt="image" src="https://user-images.githubusercontent.com/1094930/64496066-28d8a400-d26f-11e9-89ea-8b1a03b69872.png">
**Test to netperf.bufferbloat.net gives latency 55-65 msec:**
<img width="586" alt="image" src="https://user-images.githubusercontent.com/1094930/64496060-1d857880-d26f-11e9-9793-a36c7e0b0423.png">
**Text summary from flent-fremont.bufferbloat.net:**
```
bash-3.2$ flent -x -H flent-fremont.bufferbloat.net -t "Rich_Test" --test-parameter=ping_hosts=gstatic.com --te=download_streams=4 tcp_ndown
Started Flent 1.3.0 using Python 2.7.15.
Starting tcp_ndown test. Expected run time: 70 seconds.
Data file written to ./tcp_ndown-2019-09-08T193622.518606.Rich_Test.flent.gz.
Summary of tcp_ndown test run from 2019-09-08 23:36:22.518606
Title: 'Rich_Test'
avg median # data pts
Ping (ms) ICMP : 104.28 105.00 ms 350
Ping (ms) ICMP gstatic.com (extra) : 33.10 33.65 ms 350
TCP download avg : 1.72 1.74 Mbits/s 301
TCP download sum : 6.87 6.95 Mbits/s 301
TCP download::1 : 1.72 1.68 Mbits/s 285
TCP download::2 : 1.85 1.77 Mbits/s 287
TCP download::3 : 1.62 1.61 Mbits/s 284
TCP download::4 : 1.70 1.70 Mbits/s 283
bash-3.2$
```
**Text summary from netperf.bufferbloat.net:**
```
bash-3.2$ flent -x -H netperf.bufferbloat.net -t "netperf.bufferbloat.net" --test-parameter=ping_hosts=gstatic.com --te=download_streams=4 tcp_ndown
Started Flent 1.3.0 using Python 2.7.15.
Starting tcp_ndown test. Expected run time: 70 seconds.
Data file written to ./tcp_ndown-2019-09-08T194842.664611.netperf_bufferbloat_net.flent.gz.
Summary of tcp_ndown test run from 2019-09-08 23:48:42.664611
Title: 'netperf.bufferbloat.net'
avg median # data pts
Ping (ms) ICMP : 54.51 56.30 ms 349
Ping (ms) ICMP gstatic.com (extra) : 35.73 38.00 ms 349
TCP download avg : 1.73 1.74 Mbits/s 300
TCP download sum : 6.92 6.95 Mbits/s 300
TCP download::1 : 2.40 2.28 Mbits/s 279
TCP download::2 : 1.19 1.09 Mbits/s 259
TCP download::3 : 2.47 2.32 Mbits/s 278
TCP download::4 : 0.96 0.92 Mbits/s 253
bash-3.2$
```
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* Re: [Flent-users] [tohojo/flent] flent: extremely high ping times on macOS (#178)
2019-09-06 11:57 [Flent-users] [tohojo/flent] flent: extremely high ping times on macOS (#178) Rich Brown
` (7 preceding siblings ...)
2019-09-09 0:06 ` Rich Brown
@ 2019-09-09 12:25 ` Toke Høiland-Jørgensen
2019-09-09 15:07 ` Rich Brown
` (7 subsequent siblings)
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From: Toke Høiland-Jørgensen @ 2019-09-09 12:25 UTC (permalink / raw)
To: tohojo/flent; +Cc: Subscribed
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Rich Brown <notifications@github.com> writes:
> Hmmm... The `--test-parameter=ping_hosts=gstatic.com` information
> appears in the command-line summary but not in the charts. Is this
> correct?
>
> If so, the charts display significantly different latency depending on
> which -H host gets used. The Terminal display (bottom) shows fairly
> consistent ping times and transfer rate measurements using either of
> the two hosts.
>
> This raises two questions:
>
> 1. Could flent charts use the `--test-parameter=ping_hosts=...` instead of values from the -H host?
Well, it should probably show both by default. For now, there's a
separate plot type you can use to see the extra flows (-p ping_extra).
> 2. Why is there a discrepency between the
> `--test-parameter=ping_hosts=...` reading (showing 30-38 msec in my
> tests) and a separate, concurrent fping test (see original post, where
> it was running 20-22 msec)?
Good question. IPv4 vs IPv6 maybe?
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* Re: [Flent-users] [tohojo/flent] flent: extremely high ping times on macOS (#178)
2019-09-06 11:57 [Flent-users] [tohojo/flent] flent: extremely high ping times on macOS (#178) Rich Brown
` (8 preceding siblings ...)
2019-09-09 12:25 ` Toke Høiland-Jørgensen
@ 2019-09-09 15:07 ` Rich Brown
2019-09-09 15:10 ` Rich Brown
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From: Rich Brown @ 2019-09-09 15:07 UTC (permalink / raw)
To: tohojo/flent; +Cc: Subscribed
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> > 1. Could flent charts use the `--test-parameter=ping_hosts=...` instead of values from the -H host?
> Well, it should probably show both by default. For now, there's a separate plot type you can use to see the extra flows (-p ping_extra).
I don't see how to use the `-p` option. When I use it in `flent --gui -p ping_extra ...filename.gz` I see the following message:
`ERROR: Plot 'ping_extra' failed: Error loading plotter: Unable to find plot configuration 'ping_extra'. Falling back to default plot 'totals'.`
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* Re: [Flent-users] [tohojo/flent] flent: extremely high ping times on macOS (#178)
2019-09-06 11:57 [Flent-users] [tohojo/flent] flent: extremely high ping times on macOS (#178) Rich Brown
` (9 preceding siblings ...)
2019-09-09 15:07 ` Rich Brown
@ 2019-09-09 15:10 ` Rich Brown
2019-09-09 15:13 ` Rich Brown
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From: Rich Brown @ 2019-09-09 15:10 UTC (permalink / raw)
To: tohojo/flent; +Cc: Subscribed
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> > 2. Why is there a discrepency between the
`--test-parameter=ping_hosts=...` reading (showing 30-38 msec in my
tests) and a separate, concurrent fping test (see original post, where
it was running 20-22 msec)?
> Good question. IPv4 vs IPv6 maybe?
I don't think so. Here's fping for both atl.richb-hanover.com (IPv4 only) and atl6 (IPv6)...
```
bash-3.2$ fping -c 1000 atl.richb-hanover.com -D
[1568033075.420184] atl.richb-hanover.com : [0], 84 bytes, 40.4 ms (40.4 avg, 0% loss)
[1568033076.423893] atl.richb-hanover.com : [1], 84 bytes, 40.9 ms (40.6 avg, 0% loss)
[1568033077.426595] atl.richb-hanover.com : [2], 84 bytes, 41.7 ms (41.0 avg, 0% loss)
[1568033078.430768] atl.richb-hanover.com : [3], 84 bytes, 40.8 ms (40.9 avg, 0% loss)
^C
bash-3.2$ fping -c 1000 atl6.richb-hanover.com -D -6
[1568033063.252647] atl6.richb-hanover.com : [0], 64 bytes, 40.0 ms (40.0 avg, 0% loss)
[1568033064.254237] atl6.richb-hanover.com : [1], 64 bytes, 40.8 ms (40.4 avg, 0% loss)
[1568033065.257423] atl6.richb-hanover.com : [2], 64 bytes, 40.7 ms (40.5 avg, 0% loss)
[1568033066.261700] atl6.richb-hanover.com : [3], 64 bytes, 40.8 ms (40.6 avg, 0% loss)
^C
atl6.richb-hanover.com : xmt/rcv/%loss = 4/4/0%, min/avg/max = 40.0/40.6/40.8
```
And the results using atl.richb-hanover.com for the Flent: 54.77 msec during the test with 40-ish msec readings from fping and ping immediately thereafter.
```
bash-3.2$ flent -x -H atl.richb-hanover.com -t "atl.richb-hanover.com" --te=download_streams=4 tcp_ndown
Started Flent 1.3.0 using Python 2.7.15.
Starting tcp_ndown test. Expected run time: 70 seconds.
Data file written to ./tcp_ndown-2019-09-09T110116.988820.atl_richb-hanover_com.flent.gz.
Summary of tcp_ndown test run from 2019-09-09 15:01:16.988820
Title: 'atl.richb-hanover.com'
avg median # data pts
Ping (ms) ICMP : 54.77 57.05 ms 350
TCP download avg : 1.73 1.74 Mbits/s 300
TCP download sum : 6.94 6.96 Mbits/s 300
TCP download::1 : 2.09 2.02 Mbits/s 274
TCP download::2 : 1.56 1.44 Mbits/s 268
TCP download::3 : 0.99 0.90 Mbits/s 251
TCP download::4 : 2.39 2.31 Mbits/s 278
bash-3.2$ fping -D atl.richb-hanover.com -c 4
[1568041403.319308] atl.richb-hanover.com : [0], 84 bytes, 52.5 ms (52.5 avg, 0% loss)
[1568041404.312934] atl.richb-hanover.com : [1], 84 bytes, 41.0 ms (46.7 avg, 0% loss)
[1568041405.313312] atl.richb-hanover.com : [2], 84 bytes, 40.7 ms (44.7 avg, 0% loss)
[1568041406.318130] atl.richb-hanover.com : [3], 84 bytes, 40.9 ms (43.8 avg, 0% loss)
atl.richb-hanover.com : xmt/rcv/%loss = 4/4/0%, min/avg/max = 40.7/43.8/52.5
bash-3.2$ ping atl.richb-hanover.com
PING atl.richb-hanover.com (23.226.232.80): 56 data bytes
64 bytes from 23.226.232.80: icmp_seq=0 ttl=51 time=40.722 ms
64 bytes from 23.226.232.80: icmp_seq=1 ttl=51 time=41.313 ms
64 bytes from 23.226.232.80: icmp_seq=2 ttl=51 time=41.022 ms
64 bytes from 23.226.232.80: icmp_seq=3 ttl=51 time=40.871 ms
^C
--- atl.richb-hanover.com ping statistics ---
4 packets transmitted, 4 packets received, 0.0% packet loss
round-trip min/avg/max/stddev = 40.722/40.982/41.313/0.219 ms
bash-3.2$```
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* Re: [Flent-users] [tohojo/flent] flent: extremely high ping times on macOS (#178)
2019-09-06 11:57 [Flent-users] [tohojo/flent] flent: extremely high ping times on macOS (#178) Rich Brown
` (10 preceding siblings ...)
2019-09-09 15:10 ` Rich Brown
@ 2019-09-09 15:13 ` Rich Brown
2019-09-09 17:00 ` Toke Høiland-Jørgensen
` (4 subsequent siblings)
16 siblings, 0 replies; 18+ messages in thread
From: Rich Brown @ 2019-09-09 15:13 UTC (permalink / raw)
To: tohojo/flent; +Cc: Subscribed
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PS Why am I perseverating about this now? I have taken Dave's script and packaged it for ease of use. See [Coffee Shop Bloat Script](https://github.com/richb-hanover/coffee-shop-bloat-test)
I can conceal a lot of the options into the script if I know what they are. Thanks again.
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* Re: [Flent-users] [tohojo/flent] flent: extremely high ping times on macOS (#178)
2019-09-06 11:57 [Flent-users] [tohojo/flent] flent: extremely high ping times on macOS (#178) Rich Brown
` (11 preceding siblings ...)
2019-09-09 15:13 ` Rich Brown
@ 2019-09-09 17:00 ` Toke Høiland-Jørgensen
2019-09-09 17:01 ` Toke Høiland-Jørgensen
` (3 subsequent siblings)
16 siblings, 0 replies; 18+ messages in thread
From: Toke Høiland-Jørgensen @ 2019-09-09 17:00 UTC (permalink / raw)
To: tohojo/flent; +Cc: Subscribed
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Rich Brown <notifications@github.com> writes:
>> > 2. Why is there a discrepency between the
> `--test-parameter=ping_hosts=...` reading (showing 30-38 msec in my
> tests) and a separate, concurrent fping test (see original post, where
> it was running 20-22 msec)?
>
>> Good question. IPv4 vs IPv6 maybe?
>
> I don't think so. Here's fping for both atl.richb-hanover.com (IPv4 only) and atl6 (IPv6)...
>
> ```
> bash-3.2$ fping -c 1000 atl.richb-hanover.com -D
> [1568033075.420184] atl.richb-hanover.com : [0], 84 bytes, 40.4 ms (40.4 avg, 0% loss)
> [1568033076.423893] atl.richb-hanover.com : [1], 84 bytes, 40.9 ms (40.6 avg, 0% loss)
> [1568033077.426595] atl.richb-hanover.com : [2], 84 bytes, 41.7 ms (41.0 avg, 0% loss)
> [1568033078.430768] atl.richb-hanover.com : [3], 84 bytes, 40.8 ms (40.9 avg, 0% loss)
> ^C
> bash-3.2$ fping -c 1000 atl6.richb-hanover.com -D -6
> [1568033063.252647] atl6.richb-hanover.com : [0], 64 bytes, 40.0 ms (40.0 avg, 0% loss)
> [1568033064.254237] atl6.richb-hanover.com : [1], 64 bytes, 40.8 ms (40.4 avg, 0% loss)
> [1568033065.257423] atl6.richb-hanover.com : [2], 64 bytes, 40.7 ms (40.5 avg, 0% loss)
> [1568033066.261700] atl6.richb-hanover.com : [3], 64 bytes, 40.8 ms (40.6 avg, 0% loss)
> ^C
> atl6.richb-hanover.com : xmt/rcv/%loss = 4/4/0%, min/avg/max = 40.0/40.6/40.8
> ```
>
You're not setting the period; does adding -p 200 make a difference? I
suppose fping could be self-congesting if your link is very slow...
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* Re: [Flent-users] [tohojo/flent] flent: extremely high ping times on macOS (#178)
2019-09-06 11:57 [Flent-users] [tohojo/flent] flent: extremely high ping times on macOS (#178) Rich Brown
` (12 preceding siblings ...)
2019-09-09 17:00 ` Toke Høiland-Jørgensen
@ 2019-09-09 17:01 ` Toke Høiland-Jørgensen
2019-09-11 16:31 ` Toke Høiland-Jørgensen
` (2 subsequent siblings)
16 siblings, 0 replies; 18+ messages in thread
From: Toke Høiland-Jørgensen @ 2019-09-09 17:01 UTC (permalink / raw)
To: tohojo/flent; +Cc: Subscribed
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Rich Brown <notifications@github.com> writes:
>> > 1. Could flent charts use the `--test-parameter=ping_hosts=...` instead of values from the -H host?
>
>> Well, it should probably show both by default. For now, there's a separate plot type you can use to see the extra flows (-p ping_extra).
>
> I don't see how to use the `-p` option. When I use it in `flent --gui
> -p ping_extra ...filename.gz` I see the following message:
From the GUI the ping_extra plot should be selectable in the plot
selection box once you've loaded the data file...
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* Re: [Flent-users] [tohojo/flent] flent: extremely high ping times on macOS (#178)
2019-09-06 11:57 [Flent-users] [tohojo/flent] flent: extremely high ping times on macOS (#178) Rich Brown
` (13 preceding siblings ...)
2019-09-09 17:01 ` Toke Høiland-Jørgensen
@ 2019-09-11 16:31 ` Toke Høiland-Jørgensen
2019-09-12 12:26 ` Rich Brown
2019-09-12 12:26 ` Rich Brown
16 siblings, 0 replies; 18+ messages in thread
From: Toke Høiland-Jørgensen @ 2019-09-11 16:31 UTC (permalink / raw)
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Rich Brown <notifications@github.com> writes:
> Update: I'm trying to get repeatable test showing a difference of latency between the Flent ping_host values and a separate/concurrent fping run. (I saw it two days ago, but can't reproduce now... This is roundabout way to say that, for the moment, the Flent ping_host and separate fping runs are giving consistent values...)
>
>> You're not setting the period; does adding -p 200 make a difference? I
> suppose fping could be self-congesting if your link is very slow...
>
> I'm not sure how to use `-p 200` - is that a flent parameter? Thanks.
No, an fping one...
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* Re: [Flent-users] [tohojo/flent] flent: extremely high ping times on macOS (#178)
2019-09-06 11:57 [Flent-users] [tohojo/flent] flent: extremely high ping times on macOS (#178) Rich Brown
` (14 preceding siblings ...)
2019-09-11 16:31 ` Toke Høiland-Jørgensen
@ 2019-09-12 12:26 ` Rich Brown
2019-09-12 12:26 ` Rich Brown
16 siblings, 0 replies; 18+ messages in thread
From: Rich Brown @ 2019-09-12 12:26 UTC (permalink / raw)
To: tohojo/flent; +Cc: Subscribed
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I am going to close this for now. Two reasons:
1. The primary reason for this report was that I misunderstood how Flent measures latency for its default plot. Currently, that plot shows latency to the -H host. As noted in https://github.com/tohojo/flent/issues/181#issuecomment-530500478, there could be an option to substitute a nearby host for default ping measurements. This would be great because the measured latency would likely have lower variance, and any induced bloat would be a larger percentage of the total.
2. I can no longer reproduce the difference between Flent's reported latency (say, to ping_host) and a separate fping session. My original measurement process might have been faulty - I can no longer say how I got those values.
Thanks.
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* Re: [Flent-users] [tohojo/flent] flent: extremely high ping times on macOS (#178)
2019-09-06 11:57 [Flent-users] [tohojo/flent] flent: extremely high ping times on macOS (#178) Rich Brown
` (15 preceding siblings ...)
2019-09-12 12:26 ` Rich Brown
@ 2019-09-12 12:26 ` Rich Brown
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From: Rich Brown @ 2019-09-12 12:26 UTC (permalink / raw)
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Closed #178.
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