The issue can't be reproduced anymore.
** Changed in: linux-signed-azure (Ubuntu)
Status: Incomplete => Won't Fix
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Title:
multiple long
** Changed in: linux-signed-azure (Ubuntu)
Status: New => Incomplete
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Title:
multiple long delays during kernel and userspace boot
To
I added initcall debug and got some more data:
The first delay:
# [ 2.846188] localhost.localdomain kernel: AES CTR mode by8 optimization
enabled
# [ 5.919313] localhost.localdomain kernel: raid6: avx2x4 gen() 21512 MB/s
There are some silent initializations occuring between these two points,
Thanks for the useful feedback, I'll enable some finer grained metrics
tomorrow and see if I can pin point those longer delays.
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Title:
multiple
Ah, from the journal.log:
Command line: BOOT_IMAGE=/boot/vmlinuz-5.3.0-1008-azure
root=PARTUUID=1261a2c6-48ca-43ee-9b70-197f5b89b82c ro console=tty1
console=ttyS0 earlyprintk=ttyS0 panic=-1
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None of the VMs will be using spinning disks, it's all SSD; and virtual
disks anyhow.
I would not expect much timing difference on virtual hardware; there
aren't real device or pci timing delays; though the kernel may wait for
them; however, it should be consistent.
In terms of the things that
Some of the early kernel boot time variations occur when detecting and
spinning up devices sda and sbd and reading the partition information.
Given this is probably spinny disc media, one would expect variations of
this kind in early boot.
The other variations I can see are also due to probing of
And also data for bug-bionic-baseline-no-templating-Standard-DS2-v2.csv
attached
** Attachment added: "Results-baseline-no-templating-Standard-DS2-v2.ods"
Hi Ryan,
I analysed the data from comment #6 using the journal.log from bug-
bionic-baseline-after-templating-Standard-DS2-v2 and collated some
notable places in the boot process and compared boots 1 through to 10.
Attached are the results as a LibreOffice Calc spread sheet. The data
shows a
Can you update the bug with the output from the command:
cat /proc/cmdline
I wonder if an overly pessimistic rootdelay setting is being used.
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The primary concern is time before rootfs mounting and executing
/sbin/init. For the spots after that, that falls into systemd
territory.
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Title:
> 14:48:15> this slowness is happening with a particular
instance type?
I've not tested extensively across all types; but it's common for any of
the "fast" types which have SSD backing. I've seen this DS1_v2, DS2_v2,
DS3_v3, D4-v2, B2s, A2s, L4s
> 14:49:38> the slowness is happening across
here is some debug data I captured:
-rw-rw-r-- 1 ubuntu ubuntu 729 Dec 16 12:15
bug-bionic-baseline-after-templating-Standard-DS2-v2.csv
drwxrwxr-x 12 ubuntu ubuntu 22 Dec 16 12:15
bug-bionic-baseline-after-templating-Standard-DS2-v2.csv.debug/
-rw-rw-r-- 1 ubuntu ubuntu 721 Dec 16 13:07
Sorry for missing the questions earlier.
Azure has two "machine types" gen1 which boots a non-uefi based virtual
hardware platform and gen2 which is UEFI with newer virtual hardware,
details here:
https://azure.microsoft.com/en-us/updates/generation-2-virtual-machines-
Hi Ryan,
We would like to reproduce this bug to debug it further. Can you answer
the questions below relating to your initial comments in the bug:
"Booting some Bionic instances in Azure (gen1 machines).."
Q: What is a gen1 machine? What instance type is this?
"..I see some large delays during
Hi Ryan, these boot delays are happening with a particular instance type
or a particular configuration? Is this slowness consistent across
reboots (rebooting the same instance multiple times)?
I'm doing some tests (profiling kernel initcalls and user-space boot
time via systemd-analize) using an
** Changed in: linux-signed-azure (Ubuntu)
Importance: Undecided => Medium
** Changed in: linux-signed-azure (Ubuntu)
Status: New => In Progress
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** Changed in: linux-signed-azure (Ubuntu)
Assignee: (unassigned) => Colin Ian King (colin-king)
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Title:
multiple long delays during kernel
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