Hi, On Tue, Nov 28, 2017 at 10:38 PM, Jesper Dangaard Brouer <brouer@xxxxxxxxxx> wrote: > > On Tue, 28 Nov 2017 15:00:04 -0500 "MD I. Islam" <tamim@xxxxxxxxxxx> wrote: > >> On Tue, Nov 28, 2017 at 6:02 AM, Jesper Dangaard Brouer >> <brouer@xxxxxxxxxx> wrote: >> > >> > On Mon, 27 Nov 2017 18:33:10 -0500 "MD I. Islam" <tamim@xxxxxxxxxxx> wrote: >> > >> >> I was wondering if XDP can scale to many-core NPU (such as NPS-400 >> >> which has 256 cores)? I need to develop a XCP/RCP like application >> >> that can achieve bare-metal performance on each core. The application >> >> will run in a run-to-completion model. I see, DPDK can run userspace >> >> application on each core. I'm wondering if XDP has anything like that? >> >> Please let me know any suggestion. >> > >> > Hi Tamim, >> > >> > I think you are mixing up things a bit here... >> > >> > You mention a specific NIC (NPS-400) which have many cores inside the >> > NIC. You need to understand XDP is a software solution, where the >> > programming language is eBPF. XDP does NOT run inside the NIC, instead >> > XDP runs as the earliest possible step in the Linux kernel network stack. >> > >> > The only NIC that does hardware offloading of XDP is Netronome[1], see >> > their white papers[2]. >> >> Hi Jesper >> >> I was looking at >> http://events.linuxfoundation.org/sites/events/files/slides/Massively_Multi-Core_LPC_2013.pdf. >> It looks like the NPS-400 NIC also runs an embedded Linux itself. The >> packets are processed by the embedded ARC processor. Packets >> processing however is done at userspace. They also use DPDK-like >> framework OpenNPU/NPS SDK to bypass the kernel. Is it possible to >> achieve something similar to using XDP? Please let me know if I'm >> getting anything wrong. I'm not sure if it is possible for me (a >> third party developer/PhD student) to load a customized Linux on the >> their NIC. > > You should ask Gilad Ben-Yossef (Cc'ed), if he can help you getting XDP > working on this NIC? ;-) The NPS-400 wasn't a NIC but a network processor designed for a router and anyway AFAIK, Mellanox (who purchased EZchip) killed this product line. You might find their BlueField based NIC more suitable for what you want. I no longer work for Mellanox :-) Gilad -- Gilad Ben-Yossef Chief Coffee Drinker "If you take a class in large-scale robotics, can you end up in a situation where the homework eats your dog?" -- Jean-Baptiste Queru
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