From: Anatoly Burakov <anatoly.burakov@intel.com>
To: dev@dpdk.org
Cc: david.marchand@redhat.com, kaisenx.you@intel.com, thomas@monjalon.net
Subject: [PATCH v1 1/1] eal: warn user when lcore cpuset includes multiple sockets
Date: Tue, 23 May 2023 13:06:16 +0000 [thread overview]
Message-ID: <0f77ce4515ff074f997f0068635b328060322d5a.1684847165.git.anatoly.burakov@intel.com> (raw)
Currently, it is allowed to specify a cpuset for lcores such that it
will include physical cores from different NUMA nodes. This has an
effect of setting `rte_socket_id()` for that lcore to SOCKET_ID_ANY,
so add a warning about it.
Signed-off-by: Anatoly Burakov <anatoly.burakov@intel.com>
---
lib/eal/common/eal_common_thread.c | 20 +++++++++++++++++---
1 file changed, 17 insertions(+), 3 deletions(-)
diff --git a/lib/eal/common/eal_common_thread.c b/lib/eal/common/eal_common_thread.c
index 079a385630..46fd2aca1e 100644
--- a/lib/eal/common/eal_common_thread.c
+++ b/lib/eal/common/eal_common_thread.c
@@ -65,10 +65,13 @@ static void
thread_update_affinity(rte_cpuset_t *cpusetp)
{
unsigned int lcore_id = rte_lcore_id();
+ int socket_id;
+
+ /* find socket ID from cpuset */
+ socket_id = eal_cpuset_socket_id(cpusetp);
/* store socket_id in TLS for quick access */
- RTE_PER_LCORE(_socket_id) =
- eal_cpuset_socket_id(cpusetp);
+ RTE_PER_LCORE(_socket_id) = socket_id;
/* store cpuset in TLS for quick access */
memmove(&RTE_PER_LCORE(_cpuset), cpusetp,
@@ -76,9 +79,20 @@ thread_update_affinity(rte_cpuset_t *cpusetp)
if (lcore_id != (unsigned)LCORE_ID_ANY) {
/* EAL thread will update lcore_config */
- lcore_config[lcore_id].socket_id = RTE_PER_LCORE(_socket_id);
+ lcore_config[lcore_id].socket_id = socket_id;
memmove(&lcore_config[lcore_id].cpuset, cpusetp,
sizeof(rte_cpuset_t));
+
+ /*
+ * lcore_id is not LCORE_ID_ANY, meaning this is a DPDK lcore,
+ * so having a valid NUMA affinity for this lcore is important.
+ * However, if cpuset includes cores from multiple NUMA nodes,
+ * the socket ID will be set to SOCKET_ID_ANY. Notify the user
+ * about it if that happens.
+ */
+ if (socket_id == SOCKET_ID_ANY)
+ RTE_LOG(INFO, EAL, "DPDK lcore %u has NUMA affinity set to SOCKET_ID_ANY\n",
+ lcore_id);
}
}
--
2.37.2
next reply other threads:[~2023-05-23 13:06 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-05-23 13:06 Anatoly Burakov [this message]
2023-05-23 13:55 ` Bruce Richardson
2023-05-23 14:29 ` Burakov, Anatoly
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