https://bugs.dpdk.org/show_bug.cgi?id=800
Bug ID: 800
Summary: rte_malloc fails to allocate memory block, but
succeeds allocating bigger block
Product: DPDK
Version: 18.11
Hardware: All
OS: All
Status: UNCONFIRMED
Severity: normal
Priority: Normal
Component: core
Assignee: dev@dpdk.org
Reporter: maa...@mail.ru
Target Milestone: ---
rte_malloc succeeds allocating some memory, but fails to allocate less amount
(both on "clean" heap). While the behavior could be explained, it looks
counterintuitive. Would be fine to have at least some hint to guarantee
allocation success.
Machine specs:
Virtualbox VM
2 CPU
8G RAM
Also can be reproduced on some hardware, will provide specs if needed.
OS specs:
# cat /etc/redhat-release
CentOS Linux release 7.9.2009 (Core)
# uname -a
Linux test 3.10.0-1160.el7.x86_64 #1 SMP Mon Oct 19 16:18:59 UTC 2020 x86_64
x86_64 x86_64 GNU/Linux
Hugepages config:
# fgrep GRUB_CMDLINE_LINUX /etc/default/grub
GRUB_CMDLINE_LINUX="crashkernel=auto rd.lvm.lv=centos/root
rd.lvm.lv=centos/swap rhgb quiet default_hugepagesz=2M hugepagesz=2M
hugepages=2560"
# fgrep HugePages_ /proc/meminfo
HugePages_Total: 2560
HugePages_Free: 2560
HugePages_Rsvd: 0
HugePages_Surp: 0
DPDK 18.11.11 (LTS)
Built using make:
# curl https://fast.dpdk.org/rel/dpdk-18.11.11.tar.xz -O
# tar -xf dpdk-18.11.11.tar.xz
# cd dpdk-stable-18.11.11
# make T=x86_64-native-linuxapp-gcc config
# make
# make install
Steps to reproduce:
#include <rte_eal.h>
#include <rte_errno.h>
#include <stdio.h>
#include <string.h>
int main(int argc, char** argv) {
int result = rte_eal_init(argc, argv);
if (result < 0) {
printf("failed to init EAL: %s (%i)\n", strerror(rte_errno),
rte_errno);
return result;
}
void *p = rte_malloc(NULL, 0xffffffff, 0);
if (p) {
printf("success\n");
rte_free(p);
} else {
printf("failure\n");
}
p = rte_malloc(NULL, 0x100000000, 0);
if (p) {
printf("success\n");
rte_free(p);
} else {
printf("failure\n");
}
}
DPDK_HOME=/usr/local/share/dpdk/ RTE_SDK=/usr/local/share/dpdk/ make
./test-malloc --log-level 0
Expected result:
success
success
Actual result:
failure
success
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