bug#47225: QEMU warning about performance

[Maxim Cournoyer]

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
Description: Text Data

Thank you for the report,

Maxim