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Date: Tue, 24 Jul 2018 21:17:03 +0300
From: Konstantin Belousov <kostikbel@gmail.com>
To: Ed Maste <emaste@freebsd.org>
Cc: FreeBSD Current <freebsd-current@freebsd.org>
Subject: Re: i386 top reporting nan% or inf% WCPU
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On Tue, Jul 24, 2018 at 01:43:55PM -0400, Ed Maste wrote:
> I recently merged my work in progress tree up to r336665 and built a
> i386 VM image. Running the image in QEMU (qemu-system-x86_64) and
> executing 'top' I see the WCPU column reported as either nan% or inf%
> for all processes.
> 
> Prior to today I hadn't built or tested i386 in a while, so I am not
> sure off hand if this is a recent issue. amd64 is fine. Is anyone else
> seeing this?

I believe this is a qemu bug.  Their FPU emulation is very basic, at least
it was so several years ago, when not using accelerated emulation.