Kernel boot parameter "mem=" is not limiting memory size correctly
Issue
-
The kernel boot parameter
mem=is not limiting memory size correctly. -
Output without the kernel command line parameter
mem=8G.
# numactl -H
available: 2 nodes (0-1)
node 0 cpus: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47
node 0 size: 130973 MB
node 0 free: 127251 MB
node 1 cpus: 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63
node 1 size: 131072 MB
node 1 free: 128177 MB
node distances:
node 0 1
0: 10 35
1: 35 10
- Output with the kernel command line parameter
mem=8G. It is limiting memory size only from NUMA node 0.
# numactl -H
node 0 cpus: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47
node 0 size: 5533 MB
node 0 free: 2206 MB
node 1 cpus: 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63
node 1 size: 131072 MB
node 1 free: 130466 MB
node distances:
node 0 1
0: 10 35
1: 35 10
Environment
- Red Hat Enterprise Linux release 8
- Fujitsu PRIMEQUEST 3800E
- kernel
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