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

[Mike Pumford <mpumford%mudcovered.org.uk@localhost>]

On 03/02/2019 12:07, Sad Clouds wrote:
> 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
Any reason you aren't using the hardware offload capability of this 
interface? The card supports checksum ofloading for v4 &v6 frames and 
also the ofloading of some of the TCP stack work for V4 this might help 
your performance. Loogking at this output I'd suggest adding the 
following to your ifconfig.wm0 file:
tso4 ip4csum tcp4csum

Not exactly sure on the options for the V6 stuff (check the ifconfig man 
page). My wm card has more v6 offload so I don't think the v6 options I 
use would work.

I suspect the offload would give you more of a boost than on my 2-4GHz 
amd64 systems but even on those its quit noticable the difference that 
turning these on makes.

Mike