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Apparently wrong sysctl.d optimization settings #8020

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lunzima opened this issue Sep 17, 2024 · 0 comments · Fixed by #8043
Closed

Apparently wrong sysctl.d optimization settings #8020

lunzima opened this issue Sep 17, 2024 · 0 comments · Fixed by #8043

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@lunzima
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lunzima commented Sep 17, 2024

Bug description

kernel.pid_max cannot be set to a value greater than PAGE_SIZE * 8 (usually 32768) in a Linux kernel with CONFIG_BASE_SMALL=1 enabled. So systemd will complain about invalid argument with larger values.
On 64-bit architectures, the default value of kernel.pid_max is 4194304, which is quite large and definitely enough. Limiting the value doesn't help either.
In other cases, the default value of kernel.pid_max is 32768, so there may be some room for optimization on 32-bit architectures.

Enabling net.ipv4.tcp_tw_recycle is harmful and the option is removed from Linux 4.12.

net.ipv6.conf.xxx.rp_filter has never appeared in the Linux kernel. It was never implemented. However there are replacements in ip6tables/nft.

Steps to reproduce

Not relevant

Update channel(s)

stable

Package and version

aosc-aaa 11.5.2
should affect Retro/Afterglow too.
lunzima added a commit to lunzima/aosc-os-abbs that referenced this issue Sep 19, 2024
@lunzima
aosc-aaa: change sysctl parameters
66746c0 
    - Remove inappropriate kernel.pid_max, net.ipv4.tcp_tw_recycle parameters
    - Remove nonexistent net.ipv6.conf.all.rp_filter parameter

    Ref: AOSC-Dev#8020
MingcongBai pushed a commit that referenced this issue Sep 19, 2024
@lunzima @MingcongBai
aosc-aaa: change sysctl parameters
029f958 
- Remove inappropriate kernel.pid_max, net.ipv4.tcp_tw_recycle parameters.
- Remove nonexistent net.ipv6.conf.all.rp_filter parameter.

Ref: #8020
@MingcongBai MingcongBai mentioned this issue Sep 19, 2024
Merged
6 tasks
@MingcongBai MingcongBai linked a pull request Sep 20, 2024 that will close this issue
Core 11.6.0 #8043
Merged
6 tasks
MingcongBai pushed a commit that referenced this issue Sep 20, 2024
@lunzima @MingcongBai
aosc-aaa: change sysctl parameters
710e882 
- Remove inappropriate kernel.pid_max, net.ipv4.tcp_tw_recycle parameters.
- Remove nonexistent net.ipv6.conf.all.rp_filter parameter.

Ref: #8020
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Core 11.6.0 AOSC-Dev/aosc-os-abbs
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@lunzima