From: "Oscar Zhao" <oz@quacker.org>
To: dev@dpdk.org
Subject: [dpdk-dev] Feature Discussion: CPU topology detection on FreeBSD
Date: Thu, 28 Jan 2021 04:07:07 +0000 [thread overview]
Message-ID: <f030640f01e2c3dca2cb1bea3e45ae81@quacker.org> (raw)
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
next reply other threads:[~2021-01-29 9:45 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-28 4:07 Oscar Zhao [this message]
2021-01-29 10:05 ` [dpdk-dev] Feature Discussion: CPU topology detection on FreeBSD Bruce Richardson
2021-01-29 12:52 ` Burakov, Anatoly
2021-01-29 13:45 ` Bruce Richardson
2021-01-29 22:24 ` Oscar Zhao
2021-02-10 16:01 ` Burakov, Anatoly
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