On 13/3/18 1:26 pm, Alexey Kardashevskiy wrote: > Hi Igor, > > ec78f8114bc4c1 "numa: use possible_cpus for not mapped CPUs check" added a > warning about "All CPU(s) up to maxcpus should be described in NUMA config, > ability to start up with partial NUMA mappings is obsoleted and will be > removed in future" and this is printed when I add a numa node without > attached CPU like this: > > -numa node,nodeid=0,cpus=0,mem=4G > -numa node,nodeid=1,mem=131072M > > And the reason for this command line is that I am trying to pass some dodgy > host RAM (actually belongs to a GPU but directly accessible via a fast > NVLink, not PCI fabric) which let's say is equally far from all CPUs, at > least in the host's NUMA config this memory is also not bound to any CPU: > > [aik@aik ~]$ ssh yc02goos numactl -H > available: 8 nodes (0,8,250-255) > node 0 cpus: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 > 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 > 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 > node 0 size: 261735 MB > node 0 free: 258932 MB > node 8 cpus: 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 > 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 > 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 > 126 127 > node 8 size: 261739 MB > node 8 free: 261414 MB > node 250 cpus: > node 250 size: 15360 MB > node 250 free: 15359 MB > node 251 cpus: > node 251 size: 0 MB > node 251 free: 0 MB > node 252 cpus: > node 252 size: 15360 MB > node 252 free: 15359 MB > node 253 cpus: > node 253 size: 15360 MB > node 253 free: 15359 MB > node 254 cpus: > node 254 size: 15360 MB > node 254 free: 15359 MB > node 255 cpus: > node 255 size: 15360 MB > node 255 free: 15359 MB > node distances: > node 0 8 250 251 252 253 254 255 > 0: 10 40 80 80 80 80 80 80 > 8: 40 10 80 80 80 80 80 80 > 250: 80 80 10 80 80 80 80 80 > 251: 80 80 80 10 80 80 80 80 > 252: 80 80 80 80 10 80 80 80 > 253: 80 80 80 80 80 10 80 80 > 254: 80 80 80 80 80 80 10 80 > 255: 80 80 80 80 80 80 80 10 > > > I am not sure I'll progress far enough to get this working with VFIO but if > I do, I'd like to keep an ability to have such a partial config in the > future. What was the reason for this warning in the first place?
Ping? -- Alexey
