Red Hat ENTERPRISE LINUX 5.5 - S 2010, Manual

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• An updated Mesa package that adds new protocol support.
By installing these components, you can have GL-accelerated effects on your desktop with very
few changes, as well as the ability to enable and disable them at will without replacing your
X server. AIGLX also enables remote GLX applications to take advantage of hardware GLX
acceleration.
FireWire
The
firewire-sbp2
module is still included in this update as a Technology Preview. This
module enables connectivity with FireWire storage devices and scanners.
At present, FireWire does not support the following:
• IPv4
•
pcilynx
host controllers
• multi-LUN storage devices
• non-exclusive access to storage devices
In addition, the following issues still exist in FireWire:
• a memory leak in the
SBP2
driver may cause the machine to become unresponsive.
• a code in this version does not work properly in big-endian machines. This could lead to
unexpected behavior in PowerPC.
ktune
This release includes
ktune
(from the
ktune
package), a service that sets several kernel tuning
parameters to values suitable for specific system profiles. Currently,
ktune
only provides a profile
for large-memory systems running disk-intensive and network-intensive applications.
The settings provides by
ktune
do not override those set in
/etc/sysctl.conf
or through the
kernel command line.
ktune
may not be suitable on some systems and workloads; as such, you
should test it comprehensively before deploying to production.
You can disable any configuration set by
ktune
and revert to your normall settings by simply
stopping the
ktune
service using
service ktune stop
(as root).
SGPIO Support for dmraid
Serial General Purpose Input Output (SGPIO) is an industry standard communication method
used between a main board and a variety of internal and external hard disk drive bay enclosures.
This method can be used to control LED lights on an enclosure through the AHCI driver interface.
In this release, SGPIO support in
dmraid
is included as a technology preview. This will allow
dmraid
to work properly with disk enclosures.
GCC 4.4
The
Gnu Compiler Collection version 4.4 (GCC4.4)
is now included in this release as a
Technology Preview. This collection of compilers include C, C++, and Fortran compilers along with
support libraries.
Note that in the
gcc44
packages, the default for the
gnu89-inline
option has been changed
to
-fgnu89-inline
, whereas upstream and future updates of Red Hat Enterprise Linux 5 will