On Thu, Jan 28, 2021 at 04:07:07AM +0000, Oscar Zhao wrote: > Hello dpdk devs, > > I would like to discuss the feasibility of implementing CPU topology > detection on FreeBSD. Currently both eal_cpu_core_id() and > eal_cpu_socket_id() in rte_eal library always return 0 on FreeBSD, making > NUMA-aware development impossible without resorting to external libraries or > system APIs. > > The CPU topology information is available via sysct kern.sched.topology_spec. > The only issue is that the return value is an XML formatted object (see > https://forums.freebsd.org/threads/number-of-cpus-and-cores.41299/). > (https://forums.freebsd.org/threads/number-of-cpus-and-cores.41299/) I'm not > sure how feasible it is to parse XML inside DPDK. > > On a side note, obtaining the physical NUMA node id of a core is easy - > sysctl dev.cpu.[cpu#].%domain returns the corresponding node id but I have > yet found a straightforward way to detect hyperthreads besides the XML thing. > > Oscar
Even adding in the numa node information would be a welcome start.
