[v2] mem: warn user when running without NUMA support

Message ID 1eaac2264febd5c36654a90b0cc13ba43a0b28ca.1553693720.git.anatoly.burakov@intel.com
State Superseded, archived
Delegated to: Thomas Monjalon
Headers show
Series
  • [v2] mem: warn user when running without NUMA support
Related show

Checks

Context Check Description
ci/intel-Performance-Testing success Performance Testing PASS
ci/mellanox-Performance-Testing fail Performance Testing issues
ci/Intel-compilation success Compilation OK
ci/checkpatch success coding style OK

Commit Message

Burakov, Anatoly March 27, 2019, 1:35 p.m.
Running in non-legacy mode on a NUMA-enabled system without libnuma
is unsupported, so explicitly print out a warning when trying to
do so.

Running in legacy mode without libnuma is still supported whether or
not we are running with libnuma support enabled, so also fix init to
allow that scenario.

Cc: stable@dpdk.org

Signed-off-by: Anatoly Burakov <anatoly.burakov@intel.com>
---

Notes:
    v2:
    - Removed unneeded eal_options include that broke the compile

 lib/librte_eal/linux/eal/eal_memalloc.c |  3 +++
 lib/librte_eal/linux/eal/eal_memory.c   | 13 +++++++++++--
 2 files changed, 14 insertions(+), 2 deletions(-)

Comments

Thomas Monjalon March 28, 2019, 8:29 p.m. | #1
27/03/2019 14:35, Anatoly Burakov:
> Running in non-legacy mode on a NUMA-enabled system without libnuma
> is unsupported, so explicitly print out a warning when trying to
> do so.
> 
> Running in legacy mode without libnuma is still supported whether or
> not we are running with libnuma support enabled, so also fix init to
> allow that scenario.
> 
> Cc: stable@dpdk.org
> 
> Signed-off-by: Anatoly Burakov <anatoly.burakov@intel.com>
> ---
> 
> Notes:
>     v2:
>     - Removed unneeded eal_options include that broke the compile

There is another error when building build-arm64-host-clang:

../lib/librte_eal/linux/eal/eal_memory.c: In function 'rte_eal_memseg_init':
../lib/librte_eal/linux/eal/eal_memory.c:2437:40: error: expected ')' before 'OPT_LEGACY_MEM'
   RTE_LOG(WARNING, EAL, "Please use --"OPT_LEGACY_MEM" option, or recompile with NUMA support.\n");
                                        ^~~~~~~~~~~~~~

Patch

diff --git a/lib/librte_eal/linux/eal/eal_memalloc.c b/lib/librte_eal/linux/eal/eal_memalloc.c
index b6fb183db..4e83a1a19 100644
--- a/lib/librte_eal/linux/eal/eal_memalloc.c
+++ b/lib/librte_eal/linux/eal/eal_memalloc.c
@@ -725,6 +725,9 @@  alloc_seg(struct rte_memseg *ms, void *addr, int socket_id,
 			__func__, socket_id, cur_socket_id);
 		goto mapped;
 	}
+#else
+	if (rte_socket_count() > 1)
+		RTE_LOG(DEBUG, EAL, "%s(): not checking hugepage NUMA node.\n");
 #endif
 
 	ms->addr = addr;
diff --git a/lib/librte_eal/linux/eal/eal_memory.c b/lib/librte_eal/linux/eal/eal_memory.c
index 1b96b576e..09758e947 100644
--- a/lib/librte_eal/linux/eal/eal_memory.c
+++ b/lib/librte_eal/linux/eal/eal_memory.c
@@ -2088,7 +2088,8 @@  memseg_primary_init_32(void)
 		socket_id = rte_socket_id_by_idx(i);
 
 #ifndef RTE_EAL_NUMA_AWARE_HUGEPAGES
-		if (socket_id > 0)
+		/* we can still sort pages by socket in legacy mode */
+		if (!internal_config.legacy_mem && socket_id > 0)
 			break;
 #endif
 
@@ -2269,7 +2270,8 @@  memseg_primary_init(void)
 			int socket_id = rte_socket_id_by_idx(i);
 
 #ifndef RTE_EAL_NUMA_AWARE_HUGEPAGES
-			if (socket_id > 0)
+			/* we can still sort pages by socket in legacy mode */
+			if (!internal_config.legacy_mem && socket_id > 0)
 				break;
 #endif
 			memtypes[cur_type].page_sz = hugepage_sz;
@@ -2428,6 +2430,13 @@  rte_eal_memseg_init(void)
 	} else {
 		RTE_LOG(ERR, EAL, "Cannot get current resource limits\n");
 	}
+#ifndef RTE_EAL_NUMA_AWARE_HUGEPAGES
+	if (!internal_config.legacy_mem && rte_socket_count() > 1) {
+		RTE_LOG(WARNING, EAL, "DPDK is running on a NUMA system, but is compiled without NUMA support.\n");
+		RTE_LOG(WARNING, EAL, "This will have adverse consequences for performance and usability.\n");
+		RTE_LOG(WARNING, EAL, "Please use --"OPT_LEGACY_MEM" option, or recompile with NUMA support.\n");
+	}
+#endif
 
 	return rte_eal_process_type() == RTE_PROC_PRIMARY ?
 #ifndef RTE_ARCH_64