@David Maybe this should be brought up in the next meeting. I don't
think there's more that can be done about this from our side.
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https://bugs.launchpad.net/bugs/1903543
Title:
Block
>From the google_guest_agent code:
google_guest_agent/instance_setup.go:
func setIOScheduler() error {
dir, err := os.Open("/sys/block")
if err != nil {
return err
}
defer dir.Close()
devs, err := dir.Readdirnames(0)
if err !=
With a modified kernel, I was able to determine the name of the process
making the change: google_guest_agent
Though I'm not really sure why it is making that change.
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In this new systemd timegraph (systemd-time-graph-2.svg) , at the time
khaled.service is run, the scheduler had to changed to [none]:
from rc.localTue Nov 10 03:39:00 UTC 2020 [mq-deadline] none
from myscript.sh Tue Nov 10 03:39:08 UTC 2020 [none] mq-deadline
The difference between the
Still trying to hunt down who is changing that attribute. It is
certainly not a kernel change that is causing this new behaviour.
Something in userspace is doing it, very late in the boot.
In the attached systemd time thingie, at the time that both rc-
local.service and khaled.service are run,
sda is definitely being registered as mq-deadline .. and it appears to
remain that way until quite late in the boot. But then something is
changing the sda scheduler later at some point. No luck so far
determining what is making that later change.
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Strangely:
[0.743029] Block layer SCSI generic (bsg) driver version 0.4 loaded (major
244)
[0.744256] io scheduler mq-deadline registered
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@colin-king dmesg output:
[0.00] Linux version 5.8.0-1008-gcp (buildd@lgw01-amd64-043) (gcc
(Ubuntu 10.2.0-13ubuntu1) 10.2.0, GNU ld (GNU Binutils for Ubuntu) 2.35.1)
#8-Ubuntu SMP Thu Oct 15 12:48:27 UTC 2020 (Ubuntu 5.8.0-1008.8-gcp 5.8.14)
[0.00] Command line:
Can you provide the output from dmesg so we can get an idea of what is
happening during boot?
** Changed in: linux-gcp (Ubuntu)
Status: New => Triaged
** Changed in: linux-gcp (Ubuntu)
Status: Triaged => Incomplete
** Changed in: linux-gcp (Ubuntu)
Importance: Undecided =>
