GNU bug report logs

#47225 QEMU warning about performance

PackageSource(s)Maintainer(s)
guix PTS Buildd Popcon
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From: Maxim Cournoyer <maxim.cournoyer@gmail.com>
To: Leo Famulari <leo@famulari.name>
Subject: Re: bug#47225: QEMU warning about performance
References: <YFLyVjT+hOYHvMS2@jasmine.lan>
Date: Tue, 06 Apr 2021 17:42:15 -0400
In-Reply-To: <YFLyVjT+hOYHvMS2@jasmine.lan> (Leo Famulari's message of "Thu,
 18 Mar 2021 02:25:26 -0400")
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[Message part 1 (text/plain, inline)]
Hi Leo,

Leo Famulari <leo@famulari.name> writes:

> 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).

The attached patch should fix it (it does for me at least!).

[0001-system-vm-Set-a-larger-value-for-the-msize-option-of.patch (text/x-patch, attachment)]
[Message part 3 (text/plain, inline)]
Thank you for the report,

Maxim

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