Ubuntu
systemd package

  1. Bug #1806012
  2. Comment #10

Comment 10 for bug 1806012

Revision history for this message
Haw Loeung (hloeung) wrote :

@lathiat:

> - Is there some specific hardware where scaling-driver=pcc-cpufreq
> and scaling-governor=ondemand performs poorly. I have yet to run a
> benchmark on my example hardware to find out.

Yes, we first started seeing this when deploying new Ubuntu Archive
servers where we had two servers in the same DC taking on the same
amount of traffic/requests. One was showing much higher load and
performing much worse than the other.

We brought up others in another DC and saw the same. The internal
ticket, RT#90571, has some details.

The specs differ with the one without issues being:

| economy - HP ProLiant DL380 G7

The ones that were showing issues are:

| hanger - HP ProLiant DL360p Gen8
| steelix - ProLiant DL380 Gen9
| keeton - ProLiant DL380p Gen8

By default, they're using the pcc-cpufreq but we also tried
acpi-cpufreq which didn't seem to have made any difference.

This led to us filing LP: #1579278 and the change to a piece of
software we use to deploy disabling the 'ondemand' CPU governor:

| https://bazaar.launchpad.net/~canonical-sysadmins/basenode/trunk/revision/98