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

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Message-ID: <ZO5OeoKA7TbAnrI1@torres.zugschlus.de>
Date:   Tue, 29 Aug 2023 22:00:58 +0200
From:   Marc Haber <mh+linux-kernel@...schlus.de>
To:     Sean Christopherson <seanjc@...gle.com>
Cc:     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>,
        Tony Lindgren <tony@...mide.com>
Subject: Re: Linux 6.5 speed regression, boot VERY slow with anything systemd
 related

Hi,

On Tue, Aug 29, 2023 at 10:14:23AM -0700, Sean Christopherson wrote:
> On Tue, Aug 29, 2023, Marc Haber wrote:
> > Both come from virt-manager, so if the XML helps more, I'll happy to
> > post that as well.
> 
> Those command lines are quite different, e.g. the Intel one has two
> serial ports versus one for the AMD VM.

Indeed? I virt-manager, I don't see a second serial port. In either case,
only the one showing up in the VM as ttyS0 is being used. But thanks for
making me look, I discovered that the machine on the Intel host still
used emulated SCSI instead of VirtIO für the main disk. I changed that.

>Unless Tony jumps in with an
> idea, I would try massaging either the good or bad VM's QEMU
> invocation, e.g. see if you can get the AMD VM to "pass" by pulling in
> stuff from the Intel VM, or get the Intel VM to fail by making its
> command line look more like the AMD VM.

In Virt-Manager, both machines don't look THAT different tbh. I verified
the XML and the differences are not big at all.

Do you want me to try different vCPU types? Currently the VM is set to
"Opteron_G3", would you recommend a different vCPU for the host having a
"AMD GX-412TC SOC" host CPU?

Greetings
Marc

-- 
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Marc Haber         | "I don't trust Computers. They | Mailadresse im Header
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