Re: [Flent-users] [tohojo/flent] flent: extremely high ping times on macOS (#178)

From: "Dave Täht" <notifications@github.com>
To: tohojo/flent <flent@noreply.github.com>
Cc: Subscribed <subscribed@noreply.github.com>
Subject: Re: [Flent-users] [tohojo/flent] flent: extremely high ping times on macOS (#178)
Date: Fri, 06 Sep 2019 07:49:36 -0700	[thread overview]
Message-ID: <tohojo/flent/issues/178/528885331@github.com> (raw)
In-Reply-To: <tohojo/flent/issues/178@github.com>


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Rich Brown <notifications@github.com> writes:\r
\r
> Using Flent 1.3.0 with fping 4.2 on macOS 10.2.6:\r
>\r
> I see high ping times (>100 msec in the following report) despite the\r
> fact that actual ping times (measured by fping during the flent test)\r
> are 20-30 msec, and none higher that 47 msec. (I am on 7mbps/768kbps\r
> DSL, so the 6.95mbps seems accurate.)\r
>\r
> Here is the data file.\r
> tcp_ndown-2019-09-06T074544.888052.Rich_Test.flent.gz\r
>\r
> What other information could I provide? Thanks.\r
>\r
> bash-3.2$ flent -x -H flent-fremont.bufferbloat.net -t "Rich_Test" --te=download_streams=4 tcp_ndown\r
> Started Flent 1.3.0 using Python 2.7.15.\r
> Starting tcp_ndown test. Expected run time: 70 seconds.\r
> Data file written to ./tcp_ndown-2019-09-06T074544.888052.Rich_Test.flent.gz.\r
>\r
> Summary of tcp_ndown test run from 2019-09-06 11:45:44.888052\r
>   Title: 'Rich_Test'\r
>\r
>                              avg       median          # data pts\r
>  Ping (ms) ICMP   :       104.03       105.00 ms              350\r
\r
I have seen this statistic be wildly wrong in the summary but correct in\r
the graph.\r
\r
>  TCP download avg :         1.71         1.74 Mbits/s         300\r
>  TCP download sum :         6.83         6.95 Mbits/s         300\r
>  TCP download::1  :         1.55         1.56 Mbits/s         281\r
>  TCP download::2  :         1.85         1.83 Mbits/s         282\r
>  TCP download::3  :         1.53         1.54 Mbits/s         282\r
>  TCP download::4  :         1.91         1.90 Mbits/s         287\r
> bash-3.2$\r
> bash-3.2$ fping --version\r
> fping: Version 4.2\r
> fping: comments to david@schweikert.ch\r
>\r
> bash-3.2$ fping -c 1000 gstatic.com -D\r
> [1567770338.594778] gstatic.com : [0], 84 bytes, 20.7 ms (20.7 avg, 0% loss)\r
> [1567770339.600662] gstatic.com : [1], 84 bytes, 21.7 ms (21.2 avg, 0% loss)\r
> [1567770340.602339] gstatic.com : [2], 84 bytes, 21.5 ms (21.3 avg, 0% loss)\r
> [1567770341.605205] gstatic.com : [3], 84 bytes, 22.2 ms (21.5 avg, 0% loss)\r
> [1567770342.608899] gstatic.com : [4], 84 bytes, 21.0 ms (21.4 avg, 0% loss)\r
> [1567770343.613397] gstatic.com : [5], 84 bytes, 21.4 ms (21.4 avg, 0% loss)\r
> [1567770344.618612] gstatic.com : [6], 84 bytes, 21.5 ms (21.4 avg, 0% loss)\r
> [1567770345.618789] gstatic.com : [7], 84 bytes, 20.8 ms (21.3 avg, 0% loss)\r
> ...\r
>\r
> —\r
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