Re: igc problems with heavy traffic

On Wed, 24 Aug 2022 19:37:43 -0400
mike tancsa <mike@sentex.net> wrote:

> On 8/24/2022 7:22 PM, Mike Jakubik wrote:
> > What kind of HW are you running on? Im assuming some sort of fairly 
> > modern x86 CPU with at least 4 cores.. Is it multiple CPUs with Numa 
> > nodes perhaps? In any case, if you are testing with iperf3, try using 
> > cpuset on iperf3 to bind it to specific cores. I had a performance 
> > issue on a modern Epyc server with a Mellanox 25Gb card. It turns out 
> > the issue was with the scheduler and how it was bouncing the processes 
> > around diff cores/CPU caches. See "Poor performance with stable/13 and 
> > Mellanox ConnectX-6 (mlx5)" on the freebsd-net mailing list for details.
> >
> > P.S. I also use a number of igc (Intel i225 @ 2.5Gb) cards at home and 
> > have had no issues with them.
> >
> >
> Hi,
> 
>      Performance is excellent. Its just the random link drops thats at 
> issue.  With default settings, running iperf3 on back to back NICs via 
> xover takes a good 20-45min before the link drop. If anything, I am 
> surprised at how much traffic these small devices can forward.  IPSEC 
> especially is super fast on RELENG_13. The link drops seem to be always 
> on the sender.  With fc disabled, reducing the link speed to 1G seems to 
> make the issue go away, or at least its not happening in overnight 
> testing. Its a Celeron N5105. https :// 
> www.aliexpress.com/item/1005003990581434.html
> 
> Also, if you hook a couple back to back via xover cable, are you able to 
> manually set the speed to 1G and pass traffic ? It doesnt work for me.
> 
>      ---Mike

FYI:
  https://en.wikipedia.org/wiki/Medium-dependent_interface

Maybe you should use straight-through cable for 1G or faster.


-- 
Tomoaki AOKI    <junchoon@dec.sakura.ne.jp>