Hey, guys: I'm running a batch of CoreOS boxes, the lsb_release is:
``` # cat /etc/lsb-release DISTRIB_ID="Container Linux by CoreOS" DISTRIB_RELEASE=2303.3.0 DISTRIB_CODENAME="Rhyolite" DISTRIB_DESCRIPTION="Container Linux by CoreOS 2303.3.0 (Rhyolite)" ``` ``` # uname -a Linux cloud-worker-25 4.19.86-coreos #1 SMP Mon Dec 2 20:13:38 -00 2019 x86_64 Intel(R) Xeon(R) CPU E5-2640 v2 @ 2.00GHz GenuineIntel GNU/Linux ``` Recently, I found my vms constently being killed due to OOM, and after digging into the problem, I finally realized that the kernel is leaking memory. Here's my slabinfo: Active / Total Objects (% used) : 83818306 / 84191607 (99.6%) Active / Total Slabs (% used) : 1336293 / 1336293 (100.0%) Active / Total Caches (% used) : 152 / 217 (70.0%) Active / Total Size (% used) : 5828768.08K / 5996848.72K (97.2%) Minimum / Average / Maximum Object : 0.01K / 0.07K / 23.25K OBJS ACTIVE USE OBJ SIZE SLABS OBJ/SLAB CACHE SIZE NAME 80253888 80253888 100% 0.06K 1253967 64 5015868K iommu_iova 489472 489123 99% 0.03K 3824 128 15296K kmalloc-32 297444 271112 91% 0.19K 7082 42 56656K dentry 254400 252784 99% 0.06K 3975 64 15900K anon_vma_chain 222528 39255 17% 0.50K 6954 32 111264K kmalloc-512 202482 201814 99% 0.19K 4821 42 38568K vm_area_struct 200192 200192 100% 0.01K 391 512 1564K kmalloc-8 170528 169359 99% 0.25K 5329 32 42632K filp 158144 153508 97% 0.06K 2471 64 9884K kmalloc-64 149914 149365 99% 0.09K 3259 46 13036K anon_vma 146640 143123 97% 0.10K 3760 39 15040K buffer_head 130368 32791 25% 0.09K 3104 42 12416K kmalloc-96 129752 129752 100% 0.07K 2317 56 9268K Acpi-Operand 105468 105106 99% 0.04K 1034 102 4136K selinux_inode_security 73080 73080 100% 0.13K 2436 30 9744K kernfs_node_cache 72360 70261 97% 0.59K 1340 54 42880K inode_cache 71040 71040 100% 0.12K 2220 32 8880K eventpoll_epi 68096 59262 87% 0.02K 266 256 1064K kmalloc-16 53652 53652 100% 0.04K 526 102 2104K pde_opener 50496 31654 62% 2.00K 3156 16 100992K kmalloc-2048 46242 46242 100% 0.19K 1101 42 8808K cred_jar 44496 43013 96% 0.66K 927 48 29664K proc_inode_cache 44352 44352 100% 0.06K 693 64 2772K task_delay_info 43516 43471 99% 0.69K 946 46 30272K sock_inode_cache 37856 27626 72% 1.00K 1183 32 37856K kmalloc-1024 36736 36736 100% 0.07K 656 56 2624K eventpoll_pwq 34076 31282 91% 0.57K 1217 28 19472K radix_tree_node 33660 30528 90% 1.05K 1122 30 35904K ext4_inode_cache 32760 30959 94% 0.19K 780 42 6240K kmalloc-192 32028 32028 100% 0.04K 314 102 1256K ext4_extent_status 30048 30048 100% 0.25K 939 32 7512K skbuff_head_cache 28736 28736 100% 0.06K 449 64 1796K fs_cache 24702 24702 100% 0.69K 537 46 17184K files_cache 23808 23808 100% 0.66K 496 48 15872K ovl_inode 23104 22945 99% 0.12K 722 32 2888K kmalloc-128 22724 21307 93% 0.69K 494 46 15808K shmem_inode_cache 21472 21472 100% 0.12K 671 32 2684K seq_file 19904 19904 100% 1.00K 622 32 19904K UNIX 17340 17340 100% 1.06K 578 30 18496K mm_struct 15980 15980 100% 0.02K 94 170 376K avtab_node 14070 14070 100% 1.06K 469 30 15008K signal_cache 13248 13248 100% 0.12K 414 32 1656K pid 12128 11777 97% 0.25K 379 32 3032K kmalloc-256 11008 11008 100% 0.02K 43 256 172K selinux_file_security 10812 10812 100% 0.04K 106 102 424K Acpi-Namespace These information shows that the 'iommu_iova' is the top memory consumer. In order to optimize the network performence of Openstack virtual machines, I enabled the vt-d feature in bios and sriov feature of Intel 82599 10G NIC. I'm assuming this is the root cause of this issue. Is there anything I can do to fix it?
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