I have made now some tests and have figured out that on the slow booting kernels the console output is slow too. For example on "time dmesg" the slow kernels needs 3.5 seconds of real time while the fast kernels needs only 1 second of real time. Could it be that the slow console output causes the boot delay (I'm using GRUB_CMDLINE_LINUX_DEFAULT="elevator=cfq" so I'm getting more output than usual on booting)?
On testing the kernels I'm seeing a fast console output on linux- image-3.13.1-031301-generic (3.13.1-031301.201401291035) but not on linux-image-3.13.2-031302-generic (3.13.2-031302.201402061638). Also on the first one I'm seeing specific dmesg entries much earlier but the total booting time isn't that fast too. That makes me unsure if this issue has really something to do with the booting problem. Possibly this problem should be bisected first to test if after a fix the booting delay still exists on recent kernels? -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1359754 Title: Booting time got slower with newer kernel versions Status in “linux” package in Ubuntu: Confirmed Bug description: I'm using Ubuntu 14.10 dev with linux-image-generic 3.16.0.9.10 and as already mentioned in the other ticket (https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1325819) I'm noticing a performance loss in booting time of a few seconds with newer versions of the kernel. But interestingly one linked kernel in the other ticket (http://kernel.ubuntu.com/~jsalisbury/lp1325819/ -> 3.13.0-031300rc3-generic) doesn't have this problem. In the attachments are 2 dmesg logs of the different kernels. As they show the 3.13.0-031300rc3-generic was ~2 seconds faster with loading the nvidia module (last lines in dmesg) than the current kernel. I'm wondering why there is this difference between those kernels in booting time. --- AlsaVersion: Advanced Linux Sound Architecture Driver Version k3.16.0-9-generic. ApportVersion: 2.14.6-0ubuntu2 Architecture: amd64 AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/hwC1D0', '/dev/snd/pcmC1D8p', '/dev/snd/pcmC1D7p', '/dev/snd/pcmC1D3p', '/dev/snd/controlC1', '/dev/snd/by-path', '/dev/snd/hwC0D0', '/dev/snd/pcmC0D2c', '/dev/snd/pcmC0D0c', '/dev/snd/pcmC0D0p', '/dev/snd/controlC0', '/dev/snd/timer'] failed with exit code 1: BootDmesg: (Nothing has been logged yet.) CRDA: Error: [Errno 2] No such file or directory Card0.Amixer.info: Card hw:0 'SB'/'HDA ATI SB at 0xfcff4000 irq 16' Mixer name : 'Realtek ALC662 rev1' Components : 'HDA:10ec0662,18497662,00100101' Controls : 36 Simple ctrls : 18 Card1.Amixer.info: Card hw:1 'NVidia'/'HDA NVidia at 0xfe97c000 irq 19' Mixer name : 'Nvidia GPU 42 HDMI/DP' Components : 'HDA:10de0042,14583555,00100100' Controls : 21 Simple ctrls : 3 CurrentDesktop: LXDE DistroRelease: Ubuntu 14.10 EcryptfsInUse: Yes HibernationDevice: RESUME=UUID=23b2ee46-5930-41bc-a3e5-33800a236db2 IwConfig: Error: [Errno 2] No such file or directory Lsusb: Error: [Errno 2] No such file or directory MachineType: To Be Filled By O.E.M. To Be Filled By O.E.M. NonfreeKernelModules: nvidia Package: linux (not installed) ProcEnviron: TERM=xterm PATH=(custom, no user) LANG=de_DE.UTF-8 SHELL=/bin/bash ProcFB: 0 VESA VGA ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-9-generic root=UUID=05338ff8-a226-421b-90a4-1dd45199f783 ro elevator=cfq ProcVersionSignature: Ubuntu 3.16.0-9.14-generic 3.16.1 RelatedPackageVersions: linux-restricted-modules-3.16.0-9-generic N/A linux-backports-modules-3.16.0-9-generic N/A linux-firmware 1.132 RfKill: Error: [Errno 2] No such file or directory Tags: utopic Uname: Linux 3.16.0-9-generic x86_64 UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: adm audio cdrom dip lpadmin plugdev sambashare sudo wireshark WifiSyslog: _MarkForUpload: True dmi.bios.date: 10/02/2013 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: P1.40 dmi.board.asset.tag: BC5FF4739C55 dmi.board.name: 960GM/U3S3 FX dmi.board.vendor: ASRock dmi.chassis.asset.tag: To Be Filled By O.E.M. dmi.chassis.type: 3 dmi.chassis.vendor: To Be Filled By O.E.M. dmi.chassis.version: To Be Filled By O.E.M. dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrP1.40:bd10/02/2013:svnToBeFilledByO.E.M.:pnToBeFilledByO.E.M.:pvrToBeFilledByO.E.M.:rvnASRock:rn960GM/U3S3FX:rvr:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.: dmi.product.name: To Be Filled By O.E.M. dmi.product.version: To Be Filled By O.E.M. dmi.sys.vendor: To Be Filled By O.E.M. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1359754/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
