HP-UX 11i Release Notes (December 2000)

Internet and Networking Services
Low Bandwidth X Extension (LBX)
Chapter 10 207
behind this new functionality is to increase the size of the logical screen
beyond what is possible using a single system with multiple graphics
cards.
A new driver and a new X server extension have been added to the X
server in order to implement this change. The functionality is enabled by
modifying the server's X* screens file. The full documentation for the
SLS/d functionality can be found in the X server information file,
/usr/lib/X11/Xserver/info/screens/hp and in the Graphics
Administration Guide.
An SLS daemon and a configuration tool are delivered to aid system
configuration. The daemon is controlled via start and stop scripts that
reside in the /sbin/init.d, /sbin/rc1.d and /sbin/rc2.d directories.
The SLS daemon is started when the system enters run-level 2 or
greater and stopped when the system enters run-level 1. See the X server
documentation for more details.
The performance of SLS/d depends on the performance of the underlying
network to which the SPUs in the system are connected. On a dedicated
network with a 100 Base-T backbone, the 2-D X Windows performance
approaches that of a single SPU SLS system.
SLS/d is transparent to applications in the same manner as SLS. Once
the system has been configured, it behaves identically to a single screen
X Window system, albeit with a much larger screen size. One
requirement is that the underlying graphics cards in the system be
homogeneous. Although not a strict requirement, it is also desirable that
the systems participating in the SLS/d system be homogeneous as well.