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Re: Throughput riddle

From David Christensen <dpchrist@holgerdanske.com>
Newsgroups linux.debian.user
Subject Re: Throughput riddle
Date 2016-03-21 06:00 +0100
Message-ID <rf06C-Ay-7@gated-at.bofh.it> (permalink)
References (2 earlier) <reLqV-7pA-13@gated-at.bofh.it> <reOyt-Yq-5@gated-at.bofh.it> <rePXA-23j-15@gated-at.bofh.it> <reSsq-3zu-7@gated-at.bofh.it> <reXBL-7rJ-1@gated-at.bofh.it>
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On 03/20/2016 07:10 PM, Celejar wrote:
> Laptop:
>
> RX packets:922215 errors:0 dropped:1967 overruns:0 frame:0
>            TX packets:1186319 errors:0 dropped:0 overruns:0 carrier:0
>            collisions:0 txqueuelen:1000
>            RX bytes:724785210 (691.2 MiB)  TX bytes:1311193642 (1.2 GiB)
>
> NAS:
>
>   RX packets:509256 errors:0 dropped:3 overruns:0 frame:0
>            TX packets:234641 errors:0 dropped:0 overruns:0 carrier:0
>            collisions:0 txqueuelen:1000
>            RX bytes:767110212 (731.5 MiB)  TX bytes:16498728 (15.7 MiB)
>            Interrupt:87
>
>
> Router (wireless interface):
>
>   RX packets:1474219 errors:0 dropped:0 overruns:0 frame:0
>            TX packets:1571154 errors:0 dropped:0 overruns:0 carrier:0
>            collisions:0 txqueuelen:1000
>            RX bytes:994970603 (948.8 MiB)  TX bytes:1544655324 (1.4 GiB)

Assuming:

1.  The configuration is:

	laptop - WiFi - router - Cat 5 - NAS

2.  You did a cold boot on everything.

3.  You ran iperf from the laptop to the NAS.

4.  You ran iperf from the NAS to the laptop.


Ideas:

1.  I assume the dropped RX statistic means that received packets were 
malformed, and not that they were dropped by a firewall rule (?).

2.  The laptop WiFi interface dropping 1967 packets while the router 
WiFi interface dropping zero leads me to think there's a problem that 
only affects the laptop receiver.  Perhaps you need turn up the 
transmitter power in the router (?).

3.  I don't understand why the NAS dropped 3 packets.  A wired 
connection should drop zero.  Maybe it's the Cat 5 cable.  Perhaps you 
need a Cat 5E.

4.  The laptop TX bytes (1.2 GiB) and NAS RX bytes (731.5 MiB) do not 
correlate well.

5.  The NAS TX bytes (15.7 MiB) and laptop RX bytes (691.2 MiB) do not 
correlate well.

6.  Information for the router wired interface is missing.


Please try another run per my assumptions, above.  Revise and re-post 
assumptions as necessary.  Post new ifconfig, iwconfig, dmesg, and 
anything else that looks like a clue.


David

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Thread

Throughput riddle Celejar <celejar@gmail.com> - 2016-03-18 17:50 +0100
  Re: Throughput riddle "John L. Ries" <jries@salford-systems.com> - 2016-03-18 19:50 +0100
    Re: Throughput riddle "John L. Ries" <jries@salford-systems.com> - 2016-03-18 20:30 +0100
      Re: Throughput riddle Celejar <celejar@gmail.com> - 2016-03-18 20:40 +0100
    Re: Throughput riddle Celejar <celejar@gmail.com> - 2016-03-18 20:40 +0100
  Re: Throughput riddle David Christensen <dpchrist@holgerdanske.com> - 2016-03-19 02:10 +0100
    Re: Throughput riddle Richard Hector <richard@walnut.gen.nz> - 2016-03-19 02:50 +0100
      Re: Throughput riddle David Christensen <dpchrist@holgerdanske.com> - 2016-03-19 03:10 +0100
        Re: Throughput riddle Richard Hector <richard@walnut.gen.nz> - 2016-03-19 03:50 +0100
          Re: Throughput riddle David Christensen <dpchrist@holgerdanske.com> - 2016-03-19 04:50 +0100
          Re: Throughput riddle Celejar <celejar@gmail.com> - 2016-03-20 14:20 +0100
    Re: Throughput riddle Celejar <celejar@gmail.com> - 2016-03-20 14:20 +0100
      Re: Throughput riddle David Christensen <dpchrist@holgerdanske.com> - 2016-03-20 17:40 +0100
        Re: Throughput riddle Celejar <celejar@gmail.com> - 2016-03-20 19:10 +0100
          Re: Throughput riddle David Christensen <dpchrist@holgerdanske.com> - 2016-03-20 21:50 +0100
            Re: Throughput riddle Celejar <celejar@gmail.com> - 2016-03-21 03:20 +0100
              Re: Throughput riddle David Christensen <dpchrist@holgerdanske.com> - 2016-03-21 06:00 +0100
                Re: Throughput riddle Celejar <celejar@gmail.com> - 2016-03-22 05:30 +0100
                Re: Throughput riddle David Christensen <dpchrist@holgerdanske.com> - 2016-03-24 02:50 +0100
                Re: Throughput riddle Celejar <celejar@gmail.com> - 2016-03-24 04:10 +0100
  Re: Throughput riddle arian <debian@semioptimal.net> - 2016-03-20 14:50 +0100
    Re: Throughput riddle Celejar <celejar@gmail.com> - 2016-03-20 15:50 +0100
      Re: Throughput riddle arian <debian@semioptimal.net> - 2016-03-20 16:30 +0100
        Re: Throughput riddle Celejar <celejar@gmail.com> - 2016-03-20 18:40 +0100
        Re: Throughput riddle Andrew McGlashan <andrew.mcglashan@affinityvision.com.au> - 2016-03-20 19:50 +0100
  RE: Throughput riddle Bonno Bloksma <b.bloksma@tio.nl> - 2016-03-21 12:50 +0100
    Re: Throughput riddle Celejar <celejar@gmail.com> - 2016-03-22 05:40 +0100
  Re: Throughput riddle Dan Purgert <dan@djph.net> - 2016-03-21 13:30 +0100
    Re: Throughput riddle Celejar <celejar@gmail.com> - 2016-03-22 05:50 +0100
      Re: Throughput riddle David <david.g_jones@ntlworld.com> - 2016-03-22 11:20 +0100
        RE: Throughput riddle Bonno Bloksma <b.bloksma@tio.nl> - 2016-03-22 13:40 +0100

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