bug#47225: closed (QEMU warning about performance)

[GNU bug Tracking System]

Your message dated Thu, 8 Apr 2021 15:17:55 -0400
with message-id <YG9W41of3m0DysgM@jasmine.lan>
and subject line Re: bug#47225: QEMU warning about performance
has caused the debbugs.gnu.org bug report #47225,
regarding QEMU warning about performance
to be marked as done.

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-- 
47225: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=47225
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> --- Begin Message ---
>
>
>
> Subject: 
>
> QEMU warning about performance
>
>
>
>
> Date: 
>
> Thu, 18 Mar 2021 02:25:26 -0400
>
>
>
>
> While using `guix system vm`, I noticed this warning. I think it's new,
> maybe from the 5.2.0 update?
>
> ------
> qemu-system-x86_64: warning: 9p: degraded performance: a reasonable high msize 
> should be chosen on client/guest side (chosen msize is <= 8192). See 
> https://wiki.qemu.org/Documentation/9psetup#msize for details.
> ------
>
> That web page suggests that we increase the virtio packet size when
> declaring the 9p file-systems, I think in %linux-vm-file-systems of (gnu
> system vm).
>
>
>
> --- End Message ---

--- Begin Message --- Subject: Re: bug#47225: QEMU warning about performance Date: Thu, 8 Apr 2021 15:17:55 -0400

On Tue, Apr 06, 2021 at 08:42:38PM -0400, Maxim Cournoyer wrote:
> I hope I'm timely; I've made a revised version of the patch, that should
> cover more cases (and actually uses 100 MiB rather than 1 MiB :-)).
> 
> Thank you,
> 

> From eb600c4ffbc8016709db9471f9dc0be1d60167a7 Mon Sep 17 00:00:00 2001
> From: Maxim Cournoyer <maxim.cournoyer@gmail.com>
> Date: Tue, 6 Apr 2021 17:37:33 -0400
> Subject: [PATCH] system: vm: Set a larger value for the msize option of the 9p
>  file system.
> 
> Fixes <https://issues.guix.gnu.org/47225>.
> 
> * gnu/system/vm.scm (%default-msize-value): New variable.
> (%linux-vm-file-systems): Use it as the value of the msize option.
> (mapping->file-system): Likewise.
> 
> Reported-by: Leo Famulari <leo@famulari.name>

Pushed as bdc96f6e0e7fbf502f368d3381297ec0b75216d7

Thanks!

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