Re: 50Gbe

Also SFP28 ports are backwards compatible with SFP+ optics.

On Fri, Aug 6, 2021 at 9:12 PM Joel Wirāmu Pauling <joel@aenertia.net>
wrote:

> SFP28 (25gbit) is the way to go for density on x86 as it matches CPU
> bound bus architecture well. QSFP28 to 4*SFP28 offers the best price per
> port density both for interconnects (the DAC TwinAX 'squid' cables are
> cheap as chips)
>
> Network Stack Throughput through CPU on modern Intel x86 _64 even on perf
> tuned OS's tops out around 40Gbit locally so 50gbit ports don't make a lot
> of sence bar for specific use cases. Going faster means SmartNIC offloads,
> which are fine for certain use cases or if you just want to push packets
> without doing anything with them (i.e NIC to NVME etc, or switching).
>
> On Fri, Aug 6, 2021 at 7:33 PM Stuart Henderson <stu@spacehopper.org>
> wrote:
>
>> On 2021-08-06, hagen@SDF.ORG <hagen@SDF.ORG> wrote:
>> >> Hi folks!
>> >>
>> >> I wonder if OBSD supports 50Gbe network cards. And what is the cable
>> >> standard to support such data transfers ?
>> >>
>> >> Thanks.
>> >>
>> >> --
>> >> The lion and the tiger may be more powerful, but the wolves do not
>> perform
>> >> in the circus
>> >
>> > $ apropos 50gb
>> > bnxt(4) - Broadcom NetXtreme-C/E 10/25/40/50Gb Ethernet device
>> >
>> > https://man.openbsd.org/bnxt.4
>> >
>> >
>>
>> Cable is usually single-mode fibre (duplex or simplex depending on which
>> QSFP28 you use) or twinax DACs. There might also be some using multimode
>> MTP cables but if there are, they're less common.
>>
>> Don't expect to get anywhere close to line rate with OpenBSD.
>>
>>
>>