rte_malloc fails to allocate memory block, but succeeds allocating bigger block

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: [email protected]
Reporter: [email protected]
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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https://bugs.dpdk.org/show_bug.cgi?id=800

David Marchand ([email protected]) changed:

What |Removed |Added
----------------------------------------------------------------------------

             Status|UNCONFIRMED                 |RESOLVED
                 CC|                            |[email protected]
         Resolution|---                         |FIXED

--- Comment #7 from David Marchand ([email protected]) --- Fixed in commit ce2f7d472e80 ("malloc: fix allocation of almost hugepage size").

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