Re: [Nix-dev] Directly configuring sysfs or /sys (not sysctl)
On 24 May 2015 at 06:27, Roger Qiu roger@polycademy.com wrote: I think sysctl is not the same as sysfs in Linux. The sysfs is a vfs that is mounted on `/sys`, whereas sysctl only controls the settings that are available inside `/proc/sys`. Right. Sorry, I didn't pay enough attention. - Bjørn ___ nix-dev mailing list nix-dev@lists.science.uu.nl http://lists.science.uu.nl/mailman/listinfo/nix-dev
Re: [Nix-dev] Directly configuring sysfs or /sys (not sysctl)
Just listing the current possible methods for configuring /sys (I haven't tried all of them): * Configuring a custom systemd service to run on boot that just executes something like `bash -c 'echo ... /sys...` * Setting up a udev rule: http://serverfault.com/a/636759/147813 * Use systemd's tmpfiles.d and write a rule that writes a parameter to /sys: http://www.freedesktop.org/software/systemd/man/tmpfiles.d.html * Use `/etc/sysfs.conf` or `/etc/sysfs.d/` and package up the systemd sysfsutils.service (this doesn't exist in Nix/NixOS currently). Perhaps the primitive in Nix could use of them as a backing. The configuration primitive could be`boot.kernel.sys` or `boot.sys`. On 24/05/2015 3:25 AM, Roger Qiu wrote: Hi, I was wondering if there was a particular Nix/NixOS configuration primitive that allowed direct permanent editing of arbitrary sysfs `/sys` parameters? Currently it seems that it's possible by creating custom systemd services (or maybe a udev rule) that run at boot which set the settings, or you could use `|/etc/sysfs.conf|.` or `/etc/sysfs.d/` (but I'm not sure if these are enabled in NixOS). Unlike sysctl settings which are clearly explained in the documentation, it's not clear where the canonical place to set `/sys` settings should be such as CPU frequency.. etc. Thanks, Roger -- Founder of Matrix AI http://matrix.ai/ +61420925975 -- Founder of Matrix AI http://matrix.ai/ +61420925975 ___ nix-dev mailing list nix-dev@lists.science.uu.nl http://lists.science.uu.nl/mailman/listinfo/nix-dev
Re: [Nix-dev] Directly configuring sysfs or /sys (not sysctl)
On 23 May 2015 at 19:35, Roger Qiu roger@polycademy.com wrote: Just listing the current possible methods for configuring /sys (I haven't tried all of them): * Configuring a custom systemd service to run on boot that just executes something like `bash -c 'echo ... /sys...` * Setting up a udev rule: http://serverfault.com/a/636759/147813 * Use systemd's tmpfiles.d and write a rule that writes a parameter to /sys: http://www.freedesktop.org/software/systemd/man/tmpfiles.d.html * Use `/etc/sysfs.conf` or `/etc/sysfs.d/` and package up the systemd sysfsutils.service (this doesn't exist in Nix/NixOS currently). Perhaps the primitive in Nix could use of them as a backing. The configuration primitive could be`boot.kernel.sys` or `boot.sys`. There is already boot.kernel.sysctl: https://nixos.org/nixos/manual/ch-options.html#opt-boot.kernel.sysctl - Bjørn ___ nix-dev mailing list nix-dev@lists.science.uu.nl http://lists.science.uu.nl/mailman/listinfo/nix-dev
Re: [Nix-dev] Directly configuring sysfs or /sys (not sysctl)
I think sysctl is not the same as sysfs in Linux. The sysfs is a vfs that is mounted on `/sys`, whereas sysctl only controls the settings that are available inside `/proc/sys`. Not all the settings in `/sys` is related to the kernel. So it's probably better for it to be located in `boot.sys`. For example /sys allows you to change CPU frequency. See: * http://www.noah.org/wiki/sysctl_and_sysfs * http://people.ee.ethz.ch/~arkeller/linux/multi/kernel_user_space_howto-2.html On BSD I think it's different, in that sysctl there might be able to do everything. On 24/05/2015 4:08 AM, Bjørn Forsman wrote: On 23 May 2015 at 19:35, Roger Qiu roger@polycademy.com wrote: Just listing the current possible methods for configuring /sys (I haven't tried all of them): * Configuring a custom systemd service to run on boot that just executes something like `bash -c 'echo ... /sys...` * Setting up a udev rule: http://serverfault.com/a/636759/147813 * Use systemd's tmpfiles.d and write a rule that writes a parameter to /sys: http://www.freedesktop.org/software/systemd/man/tmpfiles.d.html * Use `/etc/sysfs.conf` or `/etc/sysfs.d/` and package up the systemd sysfsutils.service (this doesn't exist in Nix/NixOS currently). Perhaps the primitive in Nix could use of them as a backing. The configuration primitive could be`boot.kernel.sys` or `boot.sys`. There is already boot.kernel.sysctl: https://nixos.org/nixos/manual/ch-options.html#opt-boot.kernel.sysctl - Bjørn -- Founder of Matrix AI http://matrix.ai/ +61420925975 ___ nix-dev mailing list nix-dev@lists.science.uu.nl http://lists.science.uu.nl/mailman/listinfo/nix-dev
