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Date: Fri, 8 Sep 2023 07:41:46 +0300
From: Tony Lindgren <tony@atomide.com>
To: Marc Haber <mh+linux-kernel@zugschlus.de>
Cc: Sean Christopherson <seanjc@google.com>,
	Bagas Sanjaya <bagasdotme@gmail.com>, linux-kernel@vger.kernel.org,
	Linux Regressions <regressions@lists.linux.dev>,
	Linux KVM <kvm@vger.kernel.org>,
	Paolo Bonzini <pbonzini@redhat.com>
Subject: Re: Linux 6.5 speed regression, boot VERY slow with anything systemd
 related
Message-ID: <20230908044146.GK11676@atomide.com>
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* Tony Lindgren <tony@atomide.com> [230907 13:51]:
> So I tried something similar with just kernel and ramdisk:
> 
> qemu-system-x86_64 \
> -m 768 \
> -machine pc-i440fx-2.1,accel=kvm,usb=off,dump-guest-core=off \
> -nodefaults \
> -kernel ~/bzImage \
> -initrd ~/ramdisk.img \
> -serial stdio \
> -append "console=ttyS0 debug"
> 
> It boots just fine for me. Console seems to come up a bit faster if I
> leave out the machine option. I tried this with qemu 8.0.3 on a m1 laptop
> running linux in case the machine running the qemu host might make some
> difference..

Sorry I noticed that the above example I tried on my x86_64 box, no on m1.
On m1 accel=kvm needs to be left out. Both cases work fine for me though.

Regards,

Tony