On Tue, Apr 03, 2018 at 12:25:56PM +0200, Thomas Gleixner wrote: > On Mon, 2 Apr 2018, Li RongQing wrote: > > > lots of application will read /proc/stat, like ps and vmstat, but we > > find the reading time are spreading on Purley platform which has lots > > of possible CPUs and interrupt. > > > > To reduce the reading time, only scan the present CPUs, not all possible > > CPUs, which speeds the reading of /proc/stat 20 times on Purley platform > > which has 56 present CPUs, and 224 possible CPUs > > Why is BIOS/ACPI telling the kernel that there are 224 possible CPUs unless > it supports physical CPU hotplug.
BIOS is crap, news at 11. I've got boxes like that too. Use possible_cpu=$nr if you're bothered by it -- it's what I do.
