Re: Ethernet auto-select and concurrent 10, 100 and 1000 connections

[Sad Clouds <cryintothebluesky%gmail.com@localhost>]

On Sun, 3 Feb 2019 11:27:07 +0100
tlaronde%polynum.com@localhost wrote:

> With all your help and from this summary, I suspect that the probable
> culprit is 3) above (linked also to 2) but mainly 3): an instance
> of Samba, serving a 10T or a 100T request is blocking on I/O,

You must have some ancient hardware that is not capable of utilising
full network bandwidth.

I have Sun Ultra10 with 440MHz CPU, this has a 1000baseT PCI network
card, but when sending TCP data it can only manage around 13 MiB/sec.
Looking at 'vmstat 1' output it is clear that CPU is 100% busy, 50%
system + 50% interrupt.

ultra10$ ifconfig wm0
wm0: flags=0x8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
        capabilities=2bf80<TSO4,IP4CSUM_Rx,IP4CSUM_Tx,TCP4CSUM_Rx>
        capabilities=2bf80<TCP4CSUM_Tx,UDP4CSUM_Rx,UDP4CSUM_Tx,TCP6CSUM_Tx>
        capabilities=2bf80<UDP6CSUM_Tx>
        enabled=0
        ec_capabilities=7<VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU>
        ec_enabled=0
        address: 00:0e:04:b7:7f:47
        media: Ethernet autoselect (1000baseT full-duplex,flowcontrol,rxpause,txpause)
        status: active
        inet 192.168.1.3/24 broadcast 192.168.1.255 flags 0x0
        inet6 fe80::20e:4ff:feb7:7f47%wm0/64 flags 0x0 scopeid 0x2


ultra10$ ./sv_net -mode=cli -ip=192.168.1.2 -port=9999 -threads=1 -block=64k -size=100m
Per-thread metrics:
  T 1      connect 1.01 msec,  transfer 7255.29 msec (13.78 MiB/sec, 9899.03 Pks/sec)

Per-thread socket options:
  T 1      rcvbuf=33580,  sndbuf=49688,  sndmaxseg=1460,  nodelay=Off

Aggregate metrics:
  connect  1.01 msec
  transfer 7255.29 msec (13.78 MiB/sec, 9899.03 Pks/sec)