Re: igc problems with heavy traffic

Thanks, it was a straight through cat6. It works (with the reported 
occasional link drops) at autoneg, but if I specify 1g it fails to pass traffic

On August 24, 2022 8:31:41 p.m. Tomoaki AOKI <junchoon@dec.sakura.ne.jp> wrote:

> 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>