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Bug#946791: io.weight cannot be enabled in recent Debian kernel package

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Control: retitle -1 Please enable CONFIG_IOSCHED_BFQ=y

On Thu, 26 Dec 2019 23:17:13 +0900 Ryutaroh Matsumoto
<ryutaroh.matsumoto@nagoya-u.jp> wrote:
> Source: linux
> Followup-For: Bug #946791
> Control: tags -1 + patch
> 
> Dear Maintainer,
> 
> I reported that IOWeight config item in systemd has no effect
> on recent Debian kernels. I found the root cause.
> io.weight was changed to io.bfq.weight, and recent systemd sets
> values of IOWeight to io.bfq.weight as
> 
>
https://github.com/systemd/systemd/commit/2dbc45aea747f25cc1c3848fded2ec0062f96bcf
> 
> For io.bfq.weight to appear in cgroup v2 filesystem, the bfq kernel
> module must be loaded. Addition of "bfq" to /etc/initramfs-
tools/modules
> solved this issue. Since the systemd needs bfq module to be loaded,
> changing CONFIG_IOSCHED_BFQ=m to CONFIG_IOSCHED_BFQ=y in kernel
config
> seems suitable.
> 
> If the Debian kernel team considers this issue to be handled by
another
> package, e.g. initramfs-tools or systemd, please reassign this.
> If this issue is considered not being a bug, please close this.
> 

Fwiw, the fedora kernel in F33 uses

# grep CONFIG_IOSCHED_BFQ /boot/config-5.10.22-200.fc33.x86_64 
CONFIG_IOSCHED_BFQ=y

I think using CONFIG_IOSCHED_BFQ=y instead of loading it via initramfs-
tools makes more sense (assuming it is safe to enable).


Regards,
Michael

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Bug#946791: io.weight cannot be enabled in recent Debian kernel package Michael Biebl <biebl@debian.org> - 2021-03-17 15:20 +0100

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