Poor network performances

[Emile `iMil' Heitor <imil%home.imil.net@localhost>]

Hi,

I've been witnessing poor performances while using NetBSD 7.0/amd64 on a
Gigabit network. I tried this with 2 differents NICs.

Default scenario, either re(4) or alc(4):

$ ifconfig re0 # relevant bits
re0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
        capabilities=3f00<IP4CSUM_Rx,IP4CSUM_Tx,TCP4CSUM_Rx,TCP4CSUM_Tx>
        capabilities=3f00<UDP4CSUM_Rx,UDP4CSUM_Tx>
        enabled=0
        ec_capabilities=3<VLAN_MTU,VLAN_HWTAGGING>
        ec_enabled=0
        address: f8:df:2f:f7:af:f2
        media: Ethernet autoselect (1000baseT full-duplex)
        status: active
[...]

On the actual gigabit LAN:

$ iperf3 -c coruscant -l16k
Connecting to host coruscant, port 5201
[  4] local 192.168.1.57 port 32792 connected to 192.168.1.249 port 5201
[ ID] Interval           Transfer     Bandwidth       Retr  Cwnd
[  4]   0.00-1.00   sec  6.73 MBytes  56.5 Mbits/sec    0   69.3 KBytes 
[  4]   1.00-2.00   sec  12.1 MBytes   102 Mbits/sec    0    102 KBytes 
[  4]   2.00-3.00   sec  14.1 MBytes   118 Mbits/sec    0    136 KBytes 
[  4]   3.00-4.00   sec  15.0 MBytes   126 Mbits/sec   19    154 KBytes 
[  4]   4.00-5.00   sec  16.4 MBytes   138 Mbits/sec    0    188 KBytes 
[  4]   5.00-6.00   sec  16.7 MBytes   140 Mbits/sec   30    187 KBytes 
[  4]   6.00-7.00   sec  18.3 MBytes   153 Mbits/sec    0    195 KBytes 
[  4]   7.00-8.00   sec  17.8 MBytes   149 Mbits/sec    0    195 KBytes 
[  4]   8.00-9.00   sec  18.1 MBytes   152 Mbits/sec    0    195 KBytes 
[  4]   9.00-10.00  sec  18.0 MBytes   151 Mbits/sec    0    195 KBytes 
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bandwidth       Retr
[  4]   0.00-10.00  sec   153 MBytes   129 Mbits/sec   49             sender
[  4]   0.00-10.00  sec   152 MBytes   128 Mbits/sec                  receiver

The client machine is a linux box which actually reaches Gb transfer with
another linux host.

Over my FO Internet connection:

NetBSD:
$ iperf3 -c ping.online.net
[...]
[ ID] Interval           Transfer     Bandwidth       Retr
[  6]   0.00-10.01  sec  44.3 MBytes  37.1 Mbits/sec   45             sender
[  6]   0.00-10.01  sec  44.1 MBytes  37.0 Mbits/sec                  receiver

Linux:
$ iperf3 -c ping.online.net
[...]
[ ID] Interval           Transfer     Bandwidth       Retr
[  4]   0.00-10.00  sec   124 MBytes   104 Mbits/sec   49             sender
[  4]   0.00-10.00  sec   121 MBytes   102 Mbits/sec                  receiver

To be 100% honest, the Linux box is connected through a PLC while the NetBSD box
is directly connected to the ISP router...

I tried tweaking sysctl a bit like indicated here:

https://wiki.netbsd.org/tutorials/tuning_netbsd_for_performance/

without success.

Hints? Thoughts?

----------------------------------------------------------------
Emile `iMil' Heitor * <imil@{home.imil.net,NetBSD.org,gcu.info}>
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