I've found this article:
http://coypu.sdf.org/20170525-qemu-smp
On 31.05.2017 08:51, Jaromír Doleček wrote:
> You rock! Thank you.
>
> 2017-05-31 2:19 GMT+02:00 Maya Rashish <maya%netbsd.org@localhost
> <mailto:maya%netbsd.org@localhost>>:
>
> Module Name: src
> Committed By: maya
> Date: Wed May 31 00:19:17 UTC 2017
>
> Modified Files:
> src/sys/arch/x86/x86: cpu.c
>
> Log Message:
> Do not pause many times between testing if the CPU can go.
>
> This only impacts QEMU as QEMU's implementation of pause is
> significantly slower than its implementation of nop.
>
> PR kern/51623: running qemu-x86_64 with -smp 4 - the additional
> CPUs don't start.
>
>
> To generate a diff of this commit:
> cvs rdiff -u -r1.125 -r1.126 src/sys/arch/x86/x86/cpu.c
>
> Please note that diffs are not public domain; they are subject to the
> copyright notices on the relevant files.
>
>