Messages in this thread | | | Date | Wed, 18 Jan 2017 14:55:56 +0900 | From | Masayoshi Mizuma <> | Subject | logical cpu number is discontinuity |
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Hi,
On v4.9 and v4.10 kernel, when I booted my box which has two nodes and each nodes have 48 logical cpus (Hyper Threading is enabled), the logical cpu number is discontinuity as follows.
node 0: 0-23, 256-279 node 1: 24-47, 280-303
So the following shell script fail to run. --- #!/bin/bash
for ((cpu = 0; cpu < `nproc`; cpu++)) do taskset -c $cpu ./do_work done ---
I think the logical cpu number should be continuity like as v4.8 and earlier because user applications may expect the number is continuity.
I believe this behavior was introduced by the patch series beginning with the following commit.
f7c2883 x86/acpi: Enable acpi to register all possible cpus at boot time
Do anyone have ideas for fix this behavior...?
FYI. v4.8 kernel, the logical cpu number is continuity as follows.
node 0: 0-23, 48-71 node 1: 24-47, 72-95
- Masayoshi Mizuma
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