Building a 25 Gbit/s workstation for the SCION Association

Post by Veserv » Mon, Jan 12, 2026, 9:28 PM UTC

Youden wrote: post #15

FireBeyond wrote: post #12

Earlier quoted context omitted.

My understanding is that the setup needs to allow them to work on packet routing at those speeds, not just send/receive, to simulate SCION.

Ah, so they need to hold giant routing tables in memory and do lookups in them or something like that?

Post by wmf » Mon, Jan 12, 2026, 9:47 PM UTC

Veserv wrote: post #21

Youden wrote: post #15

Earlier quoted context omitted.

Ah, so they need to hold giant routing tables in memory and do lookups in them or something like that?

Does not look like it [1]. It appears to be a protocol that enumerates your exact path, interface by interface, on every data packet. So you can just blindly forward to the next hop written in the packet itself. By my guess, a competent and efficient implementation should be able to run the routing logic at ~30-100 million packets per second per core. That would be ~300-1,000 Gb/s per core, so you would bottleneck on…

Post by tiagod » Mon, Jan 12, 2026, 11:45 PM UTC

jeffrallen wrote: post #19

Melatonic wrote: post #14

Earlier quoted context omitted.

Link?

https://oxide.computer/blog/the-cloud-computer

Post by AdamJacobMuller » Tue, Jan 13, 2026, 1:32 AM UTC

Veserv wrote: post #21

Youden wrote: post #15

Earlier quoted context omitted.

Ah, so they need to hold giant routing tables in memory and do lookups in them or something like that?

Does not look like it [1]. It appears to be a protocol that enumerates your exact path, interface by interface, on every data packet. So you can just blindly forward to the next hop written in the packet itself. By my guess, a competent and efficient implementation should be able to run the routing logic at ~30-100 million packets per second per core. That would be ~300-1,000 Gb/s per core, so you would bottleneck on…

Post by dist1ll » Tue, Jan 13, 2026, 8:59 AM UTC

Youden wrote: post #11

I have 25Gbps from Init7 at home. My "router" is a Minisforum MS-01 with a second-hand Mellanox ConnectX-5, running VyOS. My main home server is a Supermicro SYS-510D-4C-FN6P. It has dual 25Gbps ports onboard but also an Intel E810-XXVDA4T with another 4x25Gbps ports. Both of them are perfectly capable of saturating their ports using stock forwarding on Linux, no DPDK, VPP, anything, without breaking a sweat. Both of…