Re: XDP Redirect detail
Toke Høiland-Jørgensen <[email protected]>
| Newsgroups | org.kernel.vger.xdp-newbies |
|---|---|
| Message-ID | <[email protected]> |
Marco <[email protected]> writes: > Hi > > Can XDP_REDIRECT forward packets to egress interface with speed > different than ingress interface? > > More precisely, if ingress interface speed is 100 Gbps and the egress > interface speed is 10 Gbps, the xdp program can be load on two > interfaces and forward traffic (using XDP_REDIRECT) between them? Well, yes, it can forward packets just fine; but it'll just forward each packet as it comes in, there's no mechanism for queueing or otherwise rate limiting them. 10->100G is fine, of course, but in the other direction, if you are receiving at 100Gbps line rate, you'll end up forwarding 10 Gbps of it out the 10G interface and dropping the rest, semi-randomly as the TX buffers overflow. We're working on adding a queueing mechanism to XDP to help with this, but it'll probably be a little while yet before it surfaces... -Toke