Hi Andrew and mm experts It seems recent kernels lost the NUMA spreading of large hash tables allocated at boot time. Does it ring a bell, was it intentional ? Thanks Old behavior otrv5:~# grep alloc_large_system_hash /proc/vmallocinfo 0x000000006381d67a-0x000000009bc8465a 12288 alloc_large_system_hash+0xf1/0x290 pages=2 vmalloc N0=1 N1=1 0x000000009bc8465a-0x00000000b70c6dfc 12288 alloc_large_system_hash+0xf1/0x290 pages=2 vmalloc N0=1 N1=1 0x00000000b70c6dfc-0x00000000ab13330f 12288 alloc_large_system_hash+0xf1/0x290 pages=2 vmalloc N0=1 N1=1 0x000000008685d551-0x000000009ce0c789 12288 alloc_large_system_hash+0xf1/0x290 pages=2 vmalloc N0=1 N1=1 0x000000004d87acca-0x00000000781b44e4 266240 alloc_large_system_hash+0xf1/0x290 pages=64 vmalloc N0=32 N1=32 0x00000000dea0f2d2-0x00000000909e9fb3 268439552 alloc_large_system_hash+0xf1/0x290 pages=65536 vmalloc vpages N0=32768 N1=32768 0x00000000909e9fb3-0x00000000d23f4353 528384 alloc_large_system_hash+0xf1/0x290 pages=128 vmalloc N0=64 N1=64 0x00000000d23f4353-0x000000003913e8bc 134221824 alloc_large_system_hash+0xf1/0x290 pages=32768 vmalloc vpages N0=16384 N1=16384 0x000000003913e8bc-0x000000007a60bcd6 4198400 alloc_large_system_hash+0xf1/0x290 pages=1024 vmalloc vpages N0=512 N1=512 0x000000007a60bcd6-0x0000000001bc8bf9 4198400 alloc_large_system_hash+0xf1/0x290 pages=1024 vmalloc vpages N0=512 N1=512 0x0000000001bc8bf9-0x0000000022629b89 4198400 alloc_large_system_hash+0xf1/0x290 pages=1024 vmalloc vpages N0=512 N1=512 0x0000000022629b89-0x0000000027d1b0a7 1052672 alloc_large_system_hash+0xf1/0x290 pages=256 vmalloc N0=128 N1=128 0x0000000027d1b0a7-0x0000000027310068 4198400 alloc_large_system_hash+0xf1/0x290 pages=1024 vmalloc vpages N0=512 N1=512 0x0000000027310068-0x00000000a845050a 1052672 alloc_large_system_hash+0xf1/0x290 pages=256 vmalloc N0=128 N1=128 0x00000000a845050a-0x0000000028b8c1bc 2101248 alloc_large_system_hash+0xf1/0x290 pages=512 vmalloc N0=256 N1=256 0x0000000028b8c1bc-0x000000002aff2d3d 2101248 alloc_large_system_hash+0xf1/0x290 pages=512 vmalloc N0=256 N1=256 New behavior otrv6:~# grep alloc_large_system_hash /proc/vmallocinfo 0x00000000de22dded-0x000000006574cf88 12288 alloc_large_system_hash+0x18c/0x272 pages=2 vmalloc N0=2 0x000000006574cf88-0x00000000bc158a1d 12288 alloc_large_system_hash+0x18c/0x272 pages=2 vmalloc N0=2 0x00000000afa304a2-0x0000000009981fb8 12288 alloc_large_system_hash+0x18c/0x272 pages=2 vmalloc N0=2 0x00000000e3ab78c1-0x00000000ddbeadf2 528384 alloc_large_system_hash+0x18c/0x272 pages=128 vmalloc N0=128 0x0000000000cce551-0x0000000022096e73 12288 alloc_large_system_hash+0x18c/0x272 pages=2 vmalloc N0=2 0x0000000072a43217-0x00000000cf0c05f7 266240 alloc_large_system_hash+0x18c/0x272 pages=64 vmalloc N0=64 0x000000003f85e695-0x0000000042154f88 268439552 alloc_large_system_hash+0x18c/0x272 pages=65536 vmalloc vpages N0=65536 0x0000000042154f88-0x0000000066fcdca2 134221824 alloc_large_system_hash+0x18c/0x272 pages=32768 vmalloc vpages N0=32768 0x0000000066fcdca2-0x000000004074129c 4198400 alloc_large_system_hash+0x18c/0x272 pages=1024 vmalloc vpages N0=1024 0x000000004074129c-0x00000000ca32b7f9 4198400 alloc_large_system_hash+0x18c/0x272 pages=1024 vmalloc vpages N0=1024 0x00000000ca32b7f9-0x00000000a56b8117 4198400 alloc_large_system_hash+0x18c/0x272 pages=1024 vmalloc vpages N0=1024 0x00000000a56b8117-0x0000000089e9e39e 2101248 alloc_large_system_hash+0x18c/0x272 pages=512 vmalloc N0=512 0x0000000089e9e39e-0x0000000090a80b5a 1052672 alloc_large_system_hash+0x18c/0x272 pages=256 vmalloc N0=256 0x0000000090a80b5a-0x00000000e84776cb 4198400 alloc_large_system_hash+0x18c/0x272 pages=1024 vmalloc vpages N0=1024 0x00000000e84776cb-0x000000006cfc05bf 1052672 alloc_large_system_hash+0x18c/0x272 pages=256 vmalloc N0=256 0x000000006cfc05bf-0x00000000f6ce3623 1576960 alloc_large_system_hash+0x18c/0x272 pages=384 vmalloc N0=384 0x00000000f6ce3623-0x0000000002737823 2101248 alloc_large_system_hash+0x18c/0x272 pages=512 vmalloc N0=512 0x0000000002737823-0x00000000d4e74269 2101248 alloc_large_system_hash+0x18c/0x272 pages=512 vmalloc N0=512
