From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ondrej Zajicek Date: Fri, 12 May 2006 20:00:07 +0000 Subject: Several udev questions Message-Id: <20060512200007.GA9141@localhost.localdomain> MIME-Version: 1 Content-Type: multipart/mixed; boundary="cNdxnHkX5QqsyA0e" List-Id: To: linux-hotplug@vger.kernel.org --cNdxnHkX5QqsyA0e Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Hello I installed latest udev (091). It works nice, loading of all needed modules took ~8 sec (old hotplug system took ~30 sec, udev 056 ~18 sec, without any hotplug mechanism ~3 sec) and i have several questions and notes: 1) When i start system, i mount /dev, started udevd and udevtrigger. I don't explicitly copy (from /lib/udev/devices) or create any device nodes. It looks like all needed nodes are created in this way, although documentation (README) suggests copying some nodes before udevd start. What is the correct way - is the documentation obsolete, or am i miss something important? 2) What is recommended time of start of udevd? I think it should be started early during boot process (i run it just after remounting root to rw) to create all needed devices. But if i want to do logging, i have to start syslogd before ulogd. But it is usually expected to run syslogd more late, especially after mounting of other filesystems from fstab (in case of /var on separate partition). Maybe there should be something like kernel's dmesg buffer to store ulogd messages generated before start of syslog. 3) When i insert CF (and other) media with partition table, there is no hotplug event (for new partitions). I found some hacks like adding all possible partitions for that devices. Is the correct solution for this problem that kernel should send hotplug events in that case? 3) example configuration in /etc/udev/slackware has KERNEL=3D instead of KERNEL=3D=3D 4) MODE=3D644 for event devices (in /etc/udev/frugalware/udev.rules) is pretty crazy. 5) What is a good place to load useful, subsytem specific but not dependent modules like sd_mod for SCSI disks, lp for parport devices, snd_pcm_oss for soundcards? - in /etc/modules or something similar? disadvantage - not very hot-plug. - In module-init-tools (modprobe) configuration as install rule? disadvantage - as there is no concept of subsystem membership so there have to be one rule for one specific hardware driver, not one for class of drivers. - in udev.rules file? I am not in mailing list so please cc me. --=20 Elen sila lumenn' omentielvo Ondrej 'SanTiago' Zajicek (email: santiago@mail.cz, jabber: santiago@njs.ne= tlab.cz) OpenPGP encrypted e-mails preferred (KeyID 0x11DEADC3, wwwkeys.pgp.net) "To err is human -- to blame it on a computer is even more so." --cNdxnHkX5QqsyA0e Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Digital signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.1 (GNU/Linux) iEYEARECAAYFAkRk6UcACgkQw1GB2RHercO/OQCfdWIg8skf6QBOBNu7FzeWfdSH AdAAnjHAgoKuKJNu1KPINRT/mbeFX7bX =0fFp -----END PGP SIGNATURE----- --cNdxnHkX5QqsyA0e-- ------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 _______________________________________________ Linux-hotplug-devel mailing list http://linux-hotplug.sourceforge.net Linux-hotplug-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linux-hotplug-devel