Mailing List Archive

Ubuntu desktop 20.04 performance issues with Xen
Hi,

I'm facing concerning performance issues when using Ubuntu desktop 20.04 LTS managed by Xen.

Xen is installed from the Debian package xen-hypervisor-4.11-amd64.

To summarize, the whole desktop experience feels sluggish.
- connecting via GDM is slower
- typing in the Gnome terminal is slow, and there is an input lag
- sometimes editing files with sudo takes a few seconds before prompting for the password

I didn't expected this as I'm running with the default configuration, and a Xen version stable enough packaged by Ubuntu.

Looking at xl dmesg, i cannot see any indications of misconfiguration.
the Xen command line is
(XEN) Command line: placeholder no-real-mode edd=off

But these parameters are all ignored:
(XEN) parameter "placeholder" unknown!
(XEN) parameter "no-real-mode" unknown!
(XEN) parameter "edd" unknown!

My configuration:
- 5.8.0-48-generic
- 4.11.4-pre
- Ubuntu 20.04 LTS

Any ideas to investigate ?

Thanks