GNU bug report logs - #36277
[PATCH] doc: Recommend '-enable-kvm' for installing in a VM as well.

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Florian Pelz <pelzflorian <at> pelzflorian.de>
To: guix-patches <at> gnu.org
Subject: [PATCH] doc: Recommend '-enable-kvm' for installing in a VM as well.
Date: Tue, 18 Jun 2019 13:16:33 +0200

* doc (Installing Guix in a VM): Add '-enable-kvm' to example.
---
 doc/guix.texi | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/doc/guix.texi b/doc/guix.texi
index 033ad9ea8e..535709a9ab 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -2430,13 +2430,14 @@ The resulting file will be much smaller than 50 GB (typically less than
 Boot the USB installation image in an VM:
 
 @example
-qemu-system-x86_64 -m 1024 -smp 1 \
+qemu-system-x86_64 -m 1024 -smp 1 -enable-kvm \
   -net user -net nic,model=virtio -boot menu=on \
   -drive file=guix-system-install-@value{VERSION}.@var{system}.iso \
   -drive file=guixsd.img
 @end example
 
-The ordering of the drives matters.
+The ordering of the drives matters.  @code{-enable-kvm} is optional, but
+significantly improves performance, @pxref{Running Guix in a VM}.
 
 In the VM console, quickly press the @kbd{F12} key to enter the boot
 menu.  Then press the @kbd{2} key and the @kbd{RET} key to validate your
-- 
2.21.0

Message #8 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Meiyo Peng <meiyo <at> riseup.net>
To: guix-patches <at> gnu.org
Cc: 36277 <at> debbugs.gnu.org
Subject: Re: [bug#36277] [PATCH] doc: Recommend '-enable-kvm' for installing
 in a VM as well.
Date: Wed, 19 Jun 2019 11:22:23 +0800

Hi Florian,

Florian Pelz writes:

>  @example
> -qemu-system-x86_64 -m 1024 -smp 1 \
> +qemu-system-x86_64 -m 1024 -smp 1 -enable-kvm \
...
> -The ordering of the drives matters.
> +The ordering of the drives matters.  @code{-enable-kvm} is optional, but
> +significantly improves performance, @pxref{Running Guix in a VM}.

"-enable-kvm" is deprecated.  Please use "-accel kvm" instead.  QEMU
will probably support "-enable-kvm" option forever but "-accel kvm" is
recommended.

Message #14 received at 36277 <at> debbugs.gnu.org (full text, mbox):

From: "pelzflorian (Florian Pelz)" <pelzflorian <at> pelzflorian.de>
To: Meiyo Peng <meiyo <at> riseup.net>
Cc: 36277 <at> debbugs.gnu.org
Subject: Re: [bug#36277] [PATCH] doc: Recommend '-enable-kvm' for installing
 in a VM as well.
Date: Wed, 19 Jun 2019 12:41:37 +0200

[Message part 1 (text/plain, inline)]

On Wed, Jun 19, 2019 at 11:22:23AM +0800, Meiyo Peng wrote:
> Hi Florian,
> 
> Florian Pelz writes:
> 
> >  @example
> > -qemu-system-x86_64 -m 1024 -smp 1 \
> > +qemu-system-x86_64 -m 1024 -smp 1 -enable-kvm \
> ...
> > -The ordering of the drives matters.
> > +The ordering of the drives matters.  @code{-enable-kvm} is optional, but
> > +significantly improves performance, @pxref{Running Guix in a VM}.
> 
> "-enable-kvm" is deprecated.  Please use "-accel kvm" instead.  QEMU
> will probably support "-enable-kvm" option forever but "-accel kvm" is
> recommended.
> 
> 
> 

Thank you Meiyo Peng!  I cannot find an official deprecation, but
-accel seems to be recommended in general.  But I am unsure.  I like
-accel; it seems less KVM-specific, that is better.

However, I cannot find -accel kvm in Debian Jessie’s manpage at

https://manpages.debian.org/jessie/qemu-system-x86/qemu-system-x86_64.1.en.html

and in a Debian Stretch VM it says: qemu-syems-x86_64: -accel: invalid
option

Maybe it is better to wait three more years until switching to -accel
so instructions work on Debian (LTS)?  If Guix wants to switch now
though, see the attached patches.

Regards,
Florian

[0001-Recommend-accel-kvm-instead-of-enable-kvm-option-for.patch (text/plain, attachment)]

[0002-doc-Recommend-accel-kvm-for-installing-in-a-VM-as-we.patch (text/plain, attachment)]

Message #17 received at 36277 <at> debbugs.gnu.org (full text, mbox):

From: Meiyo Peng <meiyo <at> riseup.net>
To: "pelzflorian \(Florian Pelz\)" <pelzflorian <at> pelzflorian.de>
Cc: 36277 <at> debbugs.gnu.org
Subject: Re: [bug#36277] [PATCH] doc: Recommend '-enable-kvm' for installing
 in a VM as well.
Date: Wed, 19 Jun 2019 19:09:15 +0800

Hi Florian,

pelzflorian (Florian Pelz) writes:

> However, I cannot find -accel kvm in Debian Jessie’s manpage at
>
> https://manpages.debian.org/jessie/qemu-system-x86/qemu-system-x86_64.1.en.html
>
> and in a Debian Stretch VM it says: qemu-syems-x86_64: -accel: invalid
> option

I always run Debian Sid ;-)

> Maybe it is better to wait three more years until switching to -accel
> so instructions work on Debian (LTS)?

Alright.  Let's keep "-enable-kvm" and wait three years.


--
Meiyo Peng
https://www.pengmeiyu.com/

Message #22 received at 36277-done <at> debbugs.gnu.org (full text, mbox):

From: Ludovic Courtès <ludo <at> gnu.org>
To: Meiyo Peng <meiyo <at> riseup.net>
Cc: "pelzflorian \(Florian Pelz\)" <pelzflorian <at> pelzflorian.de>,
 36277-done <at> debbugs.gnu.org
Subject: Re: [bug#36277] [PATCH] doc: Recommend '-enable-kvm' for installing
 in a VM as well.
Date: Mon, 24 Jun 2019 23:18:11 +0200

Hello,

Meiyo Peng <meiyo <at> riseup.net> skribis:

>> Maybe it is better to wait three more years until switching to -accel
>> so instructions work on Debian (LTS)?
>
> Alright.  Let's keep "-enable-kvm" and wait three years.

Heheh.  :-)

Based on this I installed Florian’s initial patch.

Thanks!

Ludo’.

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