From mboxrd@z Thu Jan 1 00:00:00 1970 From: Kay Sievers Date: Wed, 19 Oct 2005 18:05:36 +0000 Subject: Re: Udev incompatibility with qemu and bochs Message-Id: <20051019180536.GC21028@vrfy.org> List-Id: References: <43560651.9090802@ums.usu.ru> In-Reply-To: <43560651.9090802@ums.usu.ru> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: linux-hotplug@vger.kernel.org On Wed, Oct 19, 2005 at 10:45:55AM -0700, Greg KH wrote: > On Wed, Oct 19, 2005 at 02:39:45PM +0600, Alexander E. Patrakov wrote: > > UDEV_ALARM_TIMEOUT is defined to 120 seconds in udev.h. The problem is > > that it does take 2 minutes to populate /dev inside slow emulators like > > qemu or bochs, especially when the emulated and host CPU types differ > > and udev rules include RUN+=/sbin/udev_run_hotplugd. The reason is that > > inside those emulators exec() is very expensive (involves > > jit-compilation from one sort of machine code to another). Please > > provide an option to disable this alarm. The preferred form would be an > > environment variable, so that I can type "linux UDEV_NO_ALARM=1" at the > > boot prompt inside the emulator and see the system booting normally. > > Feel free to provide such a patch, if you need it. This timeout is a leftover from the days of tdb, which didn't work well and caused udev processes to spin around in a corrupted database. I generally don't like to introduce more facy options to udev and better set the alarm timeout to a reasonable default or remove it at all. The problem occurs only on bootup running udevstart, right? (Depending on your setup 'UDEV_RUN=0 /sbin/udevstart' may be a good option to speed up the initial population of /dev. Don't know it you really need to have RUN at that time, depends on how udev is integrated.) Kay ------------------------------------------------------- This SF.Net email is sponsored by: Power Architecture Resource Center: Free content, downloads, discussions, and more. http://solutions.newsforge.com/ibmarch.tmpl _______________________________________________ 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