netstat counts input traffic twice

[Ben RUBSON]

On 28 Sep 2016, at 18:00, Hans Petter Selasky <hps at selasky.org> wrote:
> 
> On 09/28/16 17:48, Ben RUBSON wrote:
>> 
>>> On 28 Sep 2016, at 16:01, Hans Petter Selasky <hps at selasky.org> wrote:
>>> 
>>> On 09/23/16 19:59, Ben RUBSON wrote:
>>>> netstat -b -I mlxen1
>>> 
>>> Hi Ben,
>>> 
>>> Does the attached patch make any difference?
>> 
>> Hi HPS,
>> 
>> I tested your patch, but unfortunately it does not help.
> 
> Is this a regression issue from 10.x ?

I booted a 10.3 ISO and made the test, 10.3 does not suffer from the issue :

Here is iperf on sending side :

[  3]  0.0- 1.0 sec   231 MBytes  1.93 Gbits/sec
[  3]  1.0- 2.0 sec   660 MBytes  5.53 Gbits/sec
[  3]  2.0- 3.0 sec   686 MBytes  5.75 Gbits/sec
[  3]  3.0- 4.0 sec   685 MBytes  5.75 Gbits/sec
[  3]  4.0- 5.0 sec   688 MBytes  5.77 Gbits/sec
[  3]  5.0- 6.0 sec   688 MBytes  5.77 Gbits/sec
[  3]  6.0- 7.0 sec   687 MBytes  5.76 Gbits/sec
[  3]  7.0- 8.0 sec   686 MBytes  5.75 Gbits/sec
[  3]  8.0- 9.0 sec   688 MBytes  5.77 Gbits/sec
[  3]  9.0-10.0 sec   688 MBytes  5.77 Gbits/sec
[  3]  0.0-10.0 sec  6.24 GBytes  5.36 Gbits/sec

And here is netstat on receiving side :

# netstat -w 1 -i mlxen1
            input        (Total)           output
   packets  errs idrops      bytes    packets  errs      bytes colls
         3     0     0    1342564          2     0        242     0
     20010     0     0  288125410       9861     0     690494     0
     76138     0     0  714913534      37134     0    2599418     0
     84279     0     0  720127612      40735     0    2851628     0
     84629     0     0  725851168      40776     0    2854428     0
     84132     0     0  736770514      40658     0    2846168     0
     83584     0     0  717375282      40657     0    2846092     0
     83669     0     0  734551794      40825     0    2857858     0
     83854     0     0  716303392      40866     0    2860748     0
     83944     0     0  730653274      40795     0    2855752     0
     84523     0     0  663718362      41136     0    2879616     0
      9844     0     0     190720       4769     0     334016     0

Receiving side info :

# uname -a
FreeBSD test 10.3-RELEASE FreeBSD 10.3-RELEASE #0 r297264: Fri Mar 25 02:10:02 UTC 2016
root at releng1.nyi.freebsd.org:/usr/obj/usr/src/sys/GENERIC amd64
# grep -i "mlx.*driver" /var/log/messages
kernel: mlx4_core: Initializing mlx4_core: Mellanox ConnectX VPI driver v2.1.6 (Apr 9 2016)

> Does other network drivers exhibit the same behaviour?

I only run FreeBSD with ConnectX3 NICs, so I can't test other hardware :-/

> With your instructions I should be able to reproduce and fix this issue.

Thank you, and of course feel free to ask again if needed.

Ben