Myself and @kamalmostafa spoke and the issue is not obvious especially as linux-azure is installed in the base image too which does not exhibit the issue.
Although not obvious @kamalmostafa did suspect the issue to lie somewhere with random number generation and a related package/kernel patch. One line of investigation is to check the package diff between the minimal image with initramfs-tools installed and the image without that installed. That diff is @ https://pastebin.canonical.com/p/7hJTSQHbyD/ Another possibility is to check the package diff between base and minimal. That diff is @ https://pastebin.canonical.com/p/B9m7GbsFhs/ -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux-azure in Ubuntu. https://bugs.launchpad.net/bugs/1795017 Title: linux-azure on cosmic minimal image boot speed Status in linux-azure package in Ubuntu: New Bug description: Hi, We're planning to share a new Cosmic minimal image for Azure including the linux-azure custom kernel. I have found boot speed increase from ~55s in non minimal image to over 6mins for minimal image. I have gathered boot log, systemd logs and cloud-init logs for this instance @ https://private-fileshare.canonical.com/~philroche/azure- cosmic-20180927/minimal/. You can see the same logs for the non minimal image @ https://private-fileshare.canonical.com/~philroche /azure-cosmic-20180927/base Most of the time seems to be spent in crng and "task swapper/0:1" (?) [ 5.774760] sd 3:0:0:0: [sdc] Attached SCSI disk [ 71.388989] random: crng init done [ 242.656057] INFO: task swapper/0:1 blocked for more than 120 seconds. [ 242.688434] Not tainted 4.15.0-1018-azure #18-Ubuntu Source: https://private-fileshare.canonical.com/~philroche/azure- cosmic-20180927/minimal/iengal3seeSee-vm-imagedebug-boot.log Please let me know if you need any more information or would like me to launch an instance for testing. I understand that minimal images are intended to boot without initramfs but I did install initramfs-tools in another test image which did result in much better boot times. See https://private-fileshare.canonical.com/~philroche/azure- cosmic-20180928/ for logs. Minimal image boot time 48.784s To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-azure/+bug/1795017/+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
