Red Hat ENTERPRISE LINUX 5.4 - RELEASE NOTES Release Note page 10

Release Notes
new capacity of the processor in the file: /sys/devices/system/cpu/cpuN/
capability.
• Control Program Identification (CPI) descriptive data is used to identify individual systems on the
Hardware Management Console (HMC). With this update, CPI data can now be associated with a
Red Hat Enterprise Linux instance.
For more information on CPI refer to the
• Fibre Channel Protocol (FCP) performance data can now be measured on Red Hat Enterprise Linux
instances on the IBM System z platform.
include:
• Performance relevant data on stack components such as Linux devices, Small Computer System
Interface (SCSI) Logical Unit Numbers (LUNs) and Host Bus Adapter (HBA) storage controller
information.
• Per stack component: current values of relevant measurements as throughput, utilization and
other applicable measurements.
• Statistical aggregations (minimum, maximum, averages and histogram) of data associated with I/
O requests including size, latency per component and totals.
• Support has been added to the kernel to issue EMC Symmetrix Control I/O. This update provides
the ability to manage EMC Symmetrix storage arrays with Red Hat Enterprise Linux on the IBM
(BZ#461288)
System z platform.
• A new feature has been implemented in the kernel to perform an Initial Program Load (IPL)
on a Red Hat Enterprise Linux virtual machine immediately following a kernel panic and
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dump.(BZ#474688)
• Hardware that supports the configuration topology facility passes the system CPU topology
information to the scheduler, allowing it to make load balancing decisions. On machines where I/O
interrupts are unevenly distributed, CPUs that are grouped together and get more I/O interrupts than
others will tend to have a higher average load, creating performance issues in some cases.
Previously, CPU topology support was enabled by default. With this update, CPU topology support
is disabled by default, and the kernel parameter "topology=on" has been added to allow this feature
(BZ#475797)
to be enabled.
• New kernel options can now be added using the IPL command without modifying the content of the
CMS parmfile, allowing for temporary overwriting of kernel options that are already provided by the
parmfile. The entire boot command line can be replaced with the VM parameter string, bypassing
any kernel options from the parmfile. Furthermore, customers can create new Linux Named Saved
Systems (NSS) on the CP/CMS command line.
• The qeth driver has been updated with HiperSockets Layer3 support for IPv6.
For further details on this feature, refer to the "qeth device driver for OSA-Express (QDIO) and
HiperSockets" chapter in IBM's "Device Drivers, Features, and Commands" book located at:
www.ibm.com/developerworks/linux/linux390/october2005_documentation.html
• Starting with z9 HiperSocket firmware returns the version string in a different format. This change
resulted in missing mcl_level information in the qeth status message issued during online setting
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41
(BZ#475820)
Device Drivers, Features, and Commands document
(BZ#475334)
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46
(BZ#475530)
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Metrics that are collected and reported on
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42
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(BZ#475572)
http://