Comments on: Gentoo: devtmpfs and boot times (revisited) http://blog.jolexa.net/2009/12/10/gentoo-devtmpfs-and-boot-times-revisited/ Random thoughts and rants...mostly Linux Mon, 06 Sep 2010 12:28:11 +0000 hourly 1 http://wordpress.org/?v=3.0.1 By: Jeremy Olexa http://blog.jolexa.net/2009/12/10/gentoo-devtmpfs-and-boot-times-revisited/comment-page-1/#comment-1649 Jeremy Olexa Sat, 19 Dec 2009 03:26:53 +0000 http://blog.jolexa.net/?p=555#comment-1649 Look in /etc/bootchartd.conf: # Whether to automatically generate the boot chart once the boot logger # completes. The boot chart will be generated in $AUTO_RENDER_DIR. # Note that the bootchart package must be installed. AUTO_RENDER="yes" Look in /etc/bootchartd.conf:

# Whether to automatically generate the boot chart once the boot logger
# completes. The boot chart will be generated in $AUTO_RENDER_DIR.
# Note that the bootchart package must be installed.
AUTO_RENDER=”yes”

]]> By: Xanadu http://blog.jolexa.net/2009/12/10/gentoo-devtmpfs-and-boot-times-revisited/comment-page-1/#comment-1636 Xanadu Thu, 17 Dec 2009 21:39:47 +0000 http://blog.jolexa.net/?p=555#comment-1636 Out of curiosity, how did you render the charts? The way to do it online seems to have been dead for a while now (unless I'm using the wrong one) and I don't see how to do it with the installed packages (yes with java enabled). bootchart-render doesn't seem to install. Thanks, M. Out of curiosity, how did you render the charts? The way to do it online seems to have been dead for a while now (unless I’m using the wrong one) and I don’t see how to do it with the installed packages (yes with java enabled). bootchart-render doesn’t seem to install.

Thanks,
M.

]]> By: Phoenix http://blog.jolexa.net/2009/12/10/gentoo-devtmpfs-and-boot-times-revisited/comment-page-1/#comment-1611 Phoenix Tue, 15 Dec 2009 20:44:47 +0000 http://blog.jolexa.net/?p=555#comment-1611 A comparision between devtmpfs and device tarball feature in /etc/conf.d/rc would be interesting. A comparision between devtmpfs and device tarball feature in /etc/conf.d/rc would be interesting.

]]> By: Pavel http://blog.jolexa.net/2009/12/10/gentoo-devtmpfs-and-boot-times-revisited/comment-page-1/#comment-1580 Pavel Fri, 11 Dec 2009 21:10:51 +0000 http://blog.jolexa.net/?p=555#comment-1580 Jeremy, if you find the right combination of devtmpfs / openrc, would you mind sharing what needs to be done? Devtmpfs is on my todo list but I cant seem to find time for it. TIA. Jeremy, if you find the right combination of devtmpfs / openrc, would you mind sharing what needs to be done? Devtmpfs is on my todo list but I cant seem to find time for it. TIA.

]]> By: Xake http://blog.jolexa.net/2009/12/10/gentoo-devtmpfs-and-boot-times-revisited/comment-page-1/#comment-1557 Xake Fri, 11 Dec 2009 09:01:58 +0000 http://blog.jolexa.net/?p=555#comment-1557 This depends on your initramfs. If you have one, and it uses a static /dev then you do not have to run commands to create nodes for things devtmpfs handles (think bootdevices, framebuffer). If your initramfs uses udev to create device nodes for your startup disks, then you do not need udev there anymore. If you do not have a initramfs, then there is currently no gain at all as udev has to be started anyway in baselayout/openrc before it lets you try to mount anything. Here otoh if you hack your initscripts you may have something that can make changes with devtmpfs and no initramfs, not having to depend on udev getting started before doing anything device related (mounting, networking, and so on) may give a little gain. This depends on your initramfs. If you have one, and it uses a static /dev then you do not have to run commands to create nodes for things devtmpfs handles (think bootdevices, framebuffer). If your initramfs uses udev to create device nodes for your startup disks, then you do not need udev there anymore.

If you do not have a initramfs, then there is currently no gain at all as udev has to be started anyway in baselayout/openrc before it lets you try to mount anything.
Here otoh if you hack your initscripts you may have something that can make changes with devtmpfs and no initramfs, not having to depend on udev getting started before doing anything device related (mounting, networking, and so on) may give a little gain.

]]> By: Jeremy Olexa http://blog.jolexa.net/2009/12/10/gentoo-devtmpfs-and-boot-times-revisited/comment-page-1/#comment-1553 Jeremy Olexa Fri, 11 Dec 2009 04:30:27 +0000 http://blog.jolexa.net/?p=555#comment-1553 You may be more knowledgeable on the subject. However, I thought that the point was that devtmpfs was to start early and fast and then let udev make corrections later. http://lkml.org/lkml/2009/5/1/19 You may be more knowledgeable on the subject. However, I thought that the point was that devtmpfs was to start early and fast and then let udev make corrections later. http://lkml.org/lkml/2009/5/1/19

]]> By: some-guy http://blog.jolexa.net/2009/12/10/gentoo-devtmpfs-and-boot-times-revisited/comment-page-1/#comment-1550 some-guy Fri, 11 Dec 2009 01:12:24 +0000 http://blog.jolexa.net/?p=555#comment-1550 If udev manages the devices along with devtmpfs, then there is no gain. If udev manages the devices along with devtmpfs, then there is no gain.

]]> By: Jeremy Olexa http://blog.jolexa.net/2009/12/10/gentoo-devtmpfs-and-boot-times-revisited/comment-page-1/#comment-1549 Jeremy Olexa Thu, 10 Dec 2009 23:29:37 +0000 http://blog.jolexa.net/?p=555#comment-1549 devtmpfs, parallel startup disabled. But devtmpfs is irrelevant in this config because it doesn't change anything. devtmpfs, parallel startup disabled. But devtmpfs is irrelevant in this config because it doesn’t change anything.

]]> By: jkt http://blog.jolexa.net/2009/12/10/gentoo-devtmpfs-and-boot-times-revisited/comment-page-1/#comment-1548 jkt Thu, 10 Dec 2009 23:10:14 +0000 http://blog.jolexa.net/?p=555#comment-1548 Your last option does not specify which /dev manager you were using together with openrc. Your last option does not specify which /dev manager you were using together with openrc.

]]> By: Jeremy Olexa http://blog.jolexa.net/2009/12/10/gentoo-devtmpfs-and-boot-times-revisited/comment-page-1/#comment-1542 Jeremy Olexa Thu, 10 Dec 2009 18:07:03 +0000 http://blog.jolexa.net/?p=555#comment-1542 Interesting. I was wondering what would need to be changed. Can you elaborate more? Interesting. I was wondering what would need to be changed. Can you elaborate more?

]]>