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From: Uwe Storbeck <[EMAIL PROTECTED]>
To: Debian Bug Tracking System <[EMAIL PROTECTED]>
Subject: hotplug: coldplug mechanism breaks systems
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Date: Mon, 18 Jul 2005 17:50:07 +0200
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Sender: Uwe Storbeck <[EMAIL PROTECTED]>
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Package: hotplug
Version: 0.0.20040329-22
Severity: important
This is my third system where hotplug breaks a lot of things after
upgrading to sarge / kernel 2.4 (graphic, sound, network cards).
The problem is the coldplug mechanism which loads a lot of unnecessary
and partly wrong modules. Even worse it is bypassing the kerneld
mechanism and ignores module aliases. This coldplug mechanism should
be disabled by default and hotplug should not try to do the job of
the kerneld process (by loading modules itself). It should assign the
corresponding devices instead and let the kerneld do it's job, i.e.
load a module if it is needed by a process and not preload it at
startup.
As a simple example: I never use a joystick on my system. So why
should hotplug load a module for the joystick at startup? Only because
my soundcard has a joystick port? This wastes my memory and by the way
breaks the soundcard driver. It should instead assign the appropriate
module to a joystick device (if not already an assignment exist) and
let kerneld load the module if a process accesses the device.
Preloading all modules for the build in hardware on startup breaks one
of the advantages of the loadable module concept.
Regards, Uwe
-- System Information:
Debian Release: 3.1
APT prefers testing
APT policy: (750, 'testing'), (650, 'unstable'), (1, 'experimental')
Architecture: i386 (i686)
Kernel: Linux 2.4.31
Locale: LANG=C, LC_CTYPE=de_CH (charmap=ISO-8859-1)
Versions of packages hotplug depends on:
ii bash 2.05b-26 The GNU Bourne Again SHell
ii debconf 1.4.30.13 Debian configuration management sy
ii grep 2.5.1.ds1-4 GNU grep, egrep and fgrep
ii modutils 2.4.26-1.2 Linux module utilities
ii procps 1:3.2.1-2 The /proc file system utilities
ii sed 4.1.2-8 The GNU sed stream editor
-- debconf information:
hotplug/ignore_pci_class_display: true
hotplug/net_agent_policy: hotplug
hotplug/static_module_list:
hotplug/x11_usbmice_hack: false
---------------------------------------
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Date: Mon, 18 Jul 2005 19:06:50 +0200
To: Uwe Storbeck <[EMAIL PROTECTED]>, [EMAIL PROTECTED]
Subject: Re: Bug#318914: hotplug: coldplug mechanism breaks systems
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From: [EMAIL PROTECTED] (Marco d'Itri)
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On Jul 18, Uwe Storbeck <[EMAIL PROTECTED]> wrote:
> The problem is the coldplug mechanism which loads a lot of unnecessary
> and partly wrong modules. Even worse it is bypassing the kerneld
> mechanism and ignores module aliases. This coldplug mechanism should
> be disabled by default and hotplug should not try to do the job of
> the kerneld process (by loading modules itself). It should assign the
> corresponding devices instead and let the kerneld do it's job, i.e.
> load a module if it is needed by a process and not preload it at
> startup.
Sorry, you are very confused. Coldplugging has nothing to do with
kerneld, and hotplug just uses modprobe. If you do not like automatic
hardware detection then disable it as explained in README.Debian.
This is not a bug.
> As a simple example: I never use a joystick on my system. So why
> should hotplug load a module for the joystick at startup? Only because
> my soundcard has a joystick port? This wastes my memory and by the way
Yes. If one or two pages are a big issue for you then you should
obviously build your own kernels and probably not even use modules.
> breaks the soundcard driver. It should instead assign the appropriate
Open a bug against the kernel then, this should not happen.
> module to a joystick device (if not already an assignment exist) and
> let kerneld load the module if a process accesses the device.
Except that this is not possible if the devices does not exist yet, as
it happens when udev is installed.
--=20
ciao,
Marco
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