On 03/31/2016 09:13 PM, Felix Miata wrote:
Felix Miata composed on 2016-03-25 17:06 (UTC-0400):
Felix Miata composed on 2016-03-22 22:10 (UTC-0400):
Felix Miata composed on 2016-03-22 04:57 (UTC-0400):
Felix Miata composed on 2015-10-12 12:29 (UTC-0400):
(originally to initramfs@vger.kernel.org) https://www.mail-archive.com/initramfs@vger.kernel.org/msg04168.html
On more and more installations since most distros have replaced mkinitrd with dracut, on selecting a bootloader menu choice the "root (hd0,...filesystemtype..[Linux-bzImage, setup, ... initrd /boot/initrd" message stays on screen 40 seconds or more before the time-stamped boot messages begin scrolling the screen. IIRC, these delays first began appearing last January or February, and appear on multiple machines. All kernel and initrd images are on smallish EXT3 or EXT4 (mostly the latter) filesystems using 1024 blocksize on BIOS logical partitions on rotating rust (IIRC, all with native 512b sector size, manufactured in 2011 or earlier). All installations are configured with static IP. All have Plymouth either not installed, or are booted with noplymouth included on kernel cmdline.
e.g, on my fastest system, host msi85, a 3.0 GHz dual core Haswell, total time from boot stanza select on BIOS host msi85 to Rawhide 4.3.0-0.rc3.git4.1 (dracut initramfs.img 11,326,223) multi-user.target shell prompt ready is about 80 seconds following that 40 second delay, with last time stamp showing 36.844484.
Same msi85 system booting LMDE 2 3.16.0-4 (non-dracut? initrd.img 27,362,964; initramfs-tools 0.120) delays start of boot messages nearly 80 seconds, reaching DM greeter ready nearly 140 seconds after stanza selection.
Same system booting openSUSE Leap 42.1 4.1.8 (dracut initrd 8,082,360) exhibits no perceptible delay, reaching multi-user.target shell prompt in under 47 seconds from boot stanza selection.
Same system booting openSUSE 13.2 3.16.7 (dracut initrd 5,351,996) delays start of boot messages about 40 seconds, reaching multi-user.target bash prompt about 90 seconds after stanza selection.
Same system booting Mageia 5 4.1.8 (dracut initrd.img 9,391,664) exhibits no delay, reaching multi-user.target bash prompt in about 45 seconds.
Same system booting Wheezy 3.2.0 (non-dracut initrd.img 10,537,321) exhibits no delay, reaching DM greeter in less than about 45 seconds.
Same system booting openSUSE 13.1 3.12.44 (non-dracut initrd 7,679,390) exhibits no delay, reaching multi-user.target bash prompt in less than 45 seconds.
Same system booting Fedora 23 4.2.2 (dracut initramfs.img 11,255,214) reaches multi-user.target shell prompt in about 75 seconds after unknown kernel/initrd delay (puts display into sleep mode until boot messages appear).
Same system booting openSUSE Tumbleweed 4.2.1 (dracut initrd 8,970,760) exhibits no delay, reaching multi-user.target bash prompt in less than 45 seconds.
Same system booting (second, on sda28, vs. other on sda23) openSUSE Tumbleweed 4.2.1 (dracut initrd 8,965,124) exhibits ~40 second delay, reaching multi-user.target bash prompt in about 100 seconds.
Same system booting Kubuntu 14.10 3.16.0 (non-dracut initrd 20,550,608) exhibits no initial (linux/initrd) delay, reaching KDM greeter in about 90 seconds.
Same system booting Fedora 22 4.1.8 (dracut initrd 10,788,392) exhibits no delay, reaching multi-user.target bash prompt in less than 50 seconds.
Any ideas what could cause these delays, or how to eliminate them?
Booting host hpg33 openSUSE Tumbleweed 20160307 64 bit kernel-default-4.4.3, 6194336 bytes, and initrd 38456340 bytes, just took 9.4 minutes for the last Grub message to clear, and extended that to ~10.2 minutes to reach a shell prompt. Prior 4.3.3-5 kernel-default's initrd is 9589212 bytes, 25% the size of the current. 4.3.3-5 took 2 2/3 minutes for the Grub message to clear, about 2/3 more minute to reach shell prompt, and 4.3.3-1 about the same. 3rd prior, kernel-desktop-4.2.1 cleared the Grub message in too few seconds to count, well under a minute to reach shell prompt. kernel-default-4.5.0 cleared the Grub in 130 seconds, reached shell prompt at 174, has 8664600 byte initrd, smallest since 4.1.6's 8663972.
Mount reported /dev/mapper/* names with 4.4.3 and 4.5.0, while 4.2.1 and 4.3.3 reported device names.
What's taking so long booting with kernel-default?
On host big41's TW, 4.5.0 delay is roughly the same as with hpg33's 4.5.0, while big41's previous kernel-default-4.4.1 has no delay.
I had dracut rebuild big41's 4.5.0 without using my custom adds and omits, no customizing at all. That speeded up boot by about 30 seconds. Then I had dracut rebuild 4.5.0 with hostonly=no. That caused a 11.5 minute delay between stanza selection and initrd loading message being replaced by init messages, total time to shell prompt, 12.25 minutes. I had dracut build another with only deviation from default the omission of /etc/dracut.conf.d/20-early-microcode.conf. That caused 3m45s delay, 4m25s net to shell prompt. Big41's 4.4.1 reaches shell prompt in well under a minute.
Preliminary indication seems to be that I have narrowed this down to some EXT4 related problem. I cloned big41's HD to another physical disk, which didn't help, so not likely it is hardware fault.
Then, I created a fresh EXT3 partition of identical size as the original on the clone, rsync'd to it, adjusted bootloader and fstab accordingly, and the EXT3 copy boots 4.5.0 just as fast as 4.4.1, in well under a minute.
Fedora 24's 4.5rc6 was giving identical trouble, so I repeated the switch to EXT3 with it. Problem solved there too.
How can I narrow down what (Dracut's?) problem with EXT4 seems to be?
You might try bisecting the kernel source between 4.5 and 4.4 to see if you can identify which kernel commit is causing the problem. Larry -- To unsubscribe, e-mail: opensuse-kernel+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse-kernel+owner@opensuse.org