eal: warn on legacy memory allocation requirement

When using --no-huge mode, dynamic allocation is not supported.
Because of this limitation, the option --legacy-mem is implied
and -m may be needed to specify the amount of memory to allocate.
Otherwise the default amount MEMSIZE_IF_NO_HUGE_PAGE will be allocated.

The option --socket-mem can also be used with --legacy-mem
when hugepages are supported.

Signed-off-by: Thomas Monjalon <thomas@monjalon.net>
Acked-by: Anatoly Burakov <anatoly.burakov@intel.com>

diff --git a/lib/librte_eal/common/eal_common_options.c b/lib/librte_eal/common/eal_common_options.c
index 7b182b8..05cae5f 100644 (file)
--- a/lib/librte_eal/common/eal_common_options.c
+++ b/lib/librte_eal/common/eal_common_options.c
@@ -1591,6 +1591,11 @@ eal_check_common_options(struct internal_config *internal_cfg)
                                "with --"OPT_MATCH_ALLOCATIONS"\n");
                return -1;
        }
+       if (internal_cfg->legacy_mem && internal_cfg->memory == 0) {
+               RTE_LOG(NOTICE, EAL, "Static memory layout is selected, "
+                       "amount of reserved memory can be adjusted with "
+                       "-m or --"OPT_SOCKET_MEM"\n");
+       }
 
        return 0;
 }