linux-kernel - Re: Linux 6.5 speed regression, boot VERY slow with anything systemd related

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Date:   Fri, 8 Sep 2023 07:41:46 +0300
From:   Tony Lindgren <tony@...mide.com>
To:     Marc Haber <mh+linux-kernel@...schlus.de>
Cc:     Sean Christopherson <seanjc@...gle.com>,
        Bagas Sanjaya <bagasdotme@...il.com>,
        linux-kernel@...r.kernel.org,
        Linux Regressions <regressions@...ts.linux.dev>,
        Linux KVM <kvm@...r.kernel.org>,
        Paolo Bonzini <pbonzini@...hat.com>
Subject: Re: Linux 6.5 speed regression, boot VERY slow with anything systemd
 related

* Tony Lindgren <tony@...mide.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