Users Guide

2. Install the operating system, using the media.

3. Run the command: #dmesg|grep-i invalid.

An error message, ACPI: Invalid _TSS data is displayed.

Known Issues in Red Hat Enterprise Linux 5 Update 7

This section contains information about issues, resolutions, and their workarounds when using Red Hat Enterprise Linux

5 Update 7 on your Dell system.

C-State Function Is Unavailable

Description After enabling C-States from BIOS Setup, boot into Red Hat Enterprise Linux 5 SP7, and wait for

the processor usage to idle. Once the processor usage is idle, launch PowerTop 1.13, and

observe the C-States counters. The C0 of C-States count is around 65% - 75% as against the

normal range of 0% - 5%.

Workaround This issue is addressed in Red Hat Enterprise Linux 6 (kernel-2.6.21). Red Hat Enterprise Linux 6

has a tickless idle feature enabled. The tickless idle feature eliminates periodic timer ticks are

when the processor is idle. This allows the processor to remain in the power saving state for a

longer time.

Cause The Red Hat Enterprise Linux 5 update 6 kernel uses a periodic timer for each processor to

generate events called timer ticks. This tick happens irrespective of whether the processor is

idle or running. If a processor is idle, it has to wake up from the sleep state every time there is

a timer tick. Due to this, the time spent by the processor in the C2 state is considerably low.

Systems With Intel Multiport i350 rNDC And PCI Add-in Adapters Report Incorrect/

Duplicate Mac Address

Description Native igb driver reports incorrect MAC ids for interfaces of multiport i350 rNDC and PCI add-in

adapters.

Workaround This issue is addressed in the latest version of Dell igb driver. Use the latest driver disk from

dell.com/support during installation to address this issue.

To install the drivers:

• During Installation

Load the Dell DKMS drivers on to a USB drive in the form of a driver disk. The

anaconda installer uses these drivers and updates the original drivers.

• During Upgrade

Network configuration files are created using the original drivers during installation.

Due to this, the configuration files retain the faulty MAC address. Delete all the

configuration files present in the scripts directory /etc/sysconfig/network-scripts/ifcfg-

*, and restart the server.

For more information, see the knowledge base article DOC-6771 at redhat.com/kb/

docs/.

Additional Scenario

When you install the latest driver from dell.com/support, the igb module is placed in the /lib/

modules/<kernel version>/extra/ directory. When you upgrade to the Red Hat Enterprise Linux