[Bug 514883] [NEW] dialog-based applications seem sluggish

[AlainKnaff]

Public bug reported:

Binary package hint: kvm

When running a dialog-based application (such as Ubuntu's text mode installer) within kvm, it feels very sluggish. If I press cursor-down or up, it takes more than a second until the highlighted bar moves up or down.
Typing text in a (dialog) text fields seems ok though.

This is _not_ a bug in the guest, as on a physical machine it is fast
and snappy. Moreover, if kvm is run in vnc mode, it is fast and snappy
as well

1. > lsb_release -rd
Description:    Ubuntu 9.04
Release:        9.04

2. > apt-cache policy kvm
kvm:
  Installed: 1:84+dfsg-0ubuntu12.4
  Candidate: 1:84+dfsg-0ubuntu12.4
  Version table:
 *** 1:84+dfsg-0ubuntu12.4 0
        500 http://fr.archive.ubuntu.com jaunty-updates/main Packages
        100 /var/lib/dpkg/status
     1:84+dfsg-0ubuntu11 0
        500 http://fr.archive.ubuntu.com jaunty/main Packages

3. What I expect to happen

Kvm should react immediately at first cursor movement. If for some
reason (slow screen updates?), it should only start deferring or
dropping updates if the screen update "queue" already has some updates
being processed.

4. What happened instead

First screen refresh apparently was already delayed (maybe trying to
wait for more in order to batch them together?)

** Affects: kvm (Ubuntu)
     Importance: Undecided
         Status: New

-- 
dialog-based applications seem sluggish
https://bugs.launchpad.net/bugs/514883
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