> On 4 Sep, 2020, at 1:14 am, David Collier-Brown <davecb...@gmail.com> wrote: > > I'm wondering if edge servers with 1Gb NICs are inside the "CAKE stays > relevant" territory?
Edge servers usually have strong enough CPUs and I/O - by which I mean anything from AMD K8 and Intel Core 2 onwards with PCIe attached NICs - to run Cake at 1Gbps without needing special measures. I should run a test to see how much I can shove through an AMD Bobcat these days - not exactly a speed demon. We're usually seeing problems with the smaller-scale CPUs found in CPE SoCs, which are very much geared to take advantage of hardware accelerated packet forwarding. I think in some cases there might actually be insufficient internal I/O bandwidth to get 1Gbps out of the NIC, into the CPU, and back out to the NIC again, only through the dedicated forwarding path. That could manifest itself as a lot of kernel time spent waiting for the hardware, and can only really be solved by redesigning the hardware. - Jonathan Morton _______________________________________________ Bloat mailing list Bloat@lists.bufferbloat.net https://lists.bufferbloat.net/listinfo/bloat
