Red Hat ENTERPRISE LINUX 5.5 - TECHNICAL NOTES Manual page 230

Chapter 1. Package Updates
the client presenting an unsuable black screen. The SPICE server now compresses the initial screen
image, greatly reducing initialization time.
Users requiring remote display capabilities for KVM hypervisors are advised to upgrade to these
updated qspice packages, which resolve these issues.
1.170.2. RHBA-2010:0264: bug fix update
Updated qspice packages that fix various bugs are now available.
The Simple Protocol for Independent Computing Environments (SPICE), a remote display protocolis
used in Red Hat Enterprise Linux for viewing virtualized guests running on the KVM hypervisor or on
Red Hat Enterprise Virtualization Hypervisors.
The updated packages fix the following bugs:
* previously, if some sites sent two video frame pixmaps, the SPICE heuristic failed to detect the video
stream and caused a dramatic increase in CPU use and network traffic. With this update, the dual-
pixmap video streams is detected, video playback occurs as expected and CPU use and network
traffic no longer spike.
* the SPICE server previously used a fixed bit-rate for video streams. If external factors affected the
data stream, thi resulted in dropped frames and low quality playback. With this update, the SPICE
server no longer uses a hard-coded bit-rate; instead it can choose a bit-rate that reflects current
network conditions, improving video playback in low-bandwidth conditions.
* the SPICE server previously sent a new client connections an uncompressed initial screen image. In
low bandwidth conditions this resulted in a long period of apparent inactivity, with the client presenting
an unusable black screen. The SPICE server now compresses the initial screen image, greatly
reducing initialization time.
* if configured with SSL, previously a SPICE client would open SSL with DEFLATE compression and
the server would accept the compression, resulting in a poor display. Currently, if the client offers SSL
compression, the compression is not accepted by the server.
* the video compression algorithm can start when the guest is accessing text instead of video causing
the text to be blurry. The SPICE server now has an improved heuristic for distinguishing between
videos and textual streams.
* VM run on loaded host crashed when SPICE session opened from RHEV Manager Local-Host [trap
divide error 0]. (BZ#525055
* sometimes a client was timed out if the server was overloaded or due to low bandwidth. Client time-
out has been increased to 15 seconds to prevent
* qemu crashed when OpenOffice 3.1.1 launched .odp files.
1768
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=522049
1769
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=518193
1770
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=518388
1771
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=521488
1772
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=482111
1773
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=493375
1774
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=525055
1775
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=526458
1776
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=545862
220
(BZ#522049
1769
(BZ#518193 )
1771
(BZ#521488 )
1773
(BZ#493375 )
1774
)
1768
)
(BZ#482111
1775
this.(BZ#526458 )
(BZ#545862
1770
(BZ#518388 )
1772
)
1776
)