RHSA-2009:1243
129
• ACPI Performance and Throttling state (P- and T-state) change notifications were not being
handled correctly by the
OSPM
(Operating System-directed Power Management) driver. This
affected the Intel® Node Manager's ability to monitor and manage CPU power usage. The kernel's
processor_core
code has been update to correct this issue. (
BZ#487567
919
)
• Problems were encountered with the Lenovo X61 (and other laptops which have a docking station
with a CD/DVD drive); if the machine was undocked after a CD/DVD had been mounted in the
docking station optical drive it would not be present when the machine was re-docked. The docking
driver has been updated in this release to correct the problem. (
BZ#485181
920
)
1.110.9.7. Architecture Specific Support
Updates specific to particular computer architectures.
1.110.9.7.1. i386
Kernel updates for i386 architectures.
• In a virtual environment, timekeeping for Red Hat Enterprise Linux 64-bit kernels can be
problematic, since time is kept by counting timer interrupts. De- and re-scheduling the virtual
machine can cause a delay in these interrupts, resulting in a timekeeping discrepancy. This kernel
release reconfigures the timekeeping algorithm to keep time based on a time-elapsed counter.
(
BZ#463573
921
)
• It was found that, if their stacks exceed the combined size of ~4GB, 64-bit threaded applications
slowed down drastically in
pthread_create()
. This is because
glibc
uses
MAP_32BIT
to
allocate those stacks. As the use of
MAP_32BIT
is a legacy implementation, this update adds a new
flag (
MAP_STACK mmap
) to the kernel to avoid constraining 64-bit applications. (
BZ#459321
922
)
• The update includes a feature bit that encourages Time Stamp Clocks (TSCs) to keep running in
deep-C states. This bit
NONSTOP_TSC
acts in conjunction with
CONSTANT_TSC
.
CONSTANT_TSC
indicates that the TSC runs at constant frequency irrespective of P/T- states, and
NONSTOP_TSC
indicates that TSC does not stop in deep C-states. (
BZ#474091
923
)
• This update includes a patch to include
asm-x86_64
headers in
kernel-devel
packages built on
or for i386, i486, i586 and i686 architectures. (
BZ#491775
924
)
• This update includes a fix to ensure that specifying
memmap=X$Y
as a boot parameter on i386
architectures yields a new BIOS map. (
BZ#464500
925
)
• This update adds a patch to correct a problem with the Non-Maskable Interrupt (NMI) that appeared
in previous kernel releases. The problem appeared to affect various Intel® processors and caused
the system to report the NMI watchdog was 'stuck'. New parameters in the NMI code correct this
issue. (
BZ#500892
926
)
• This release re-introduces PCI Domain support for HP
xw9400
and
xw9300
systems.
(
BZ#474891
927
)
• Functionality has been corrected to export module
powernow-k8
parameters to
/sys/modules
.
This information was previously not exported.(
BZ#492010
928
)
1.110.9.7.2. x86_64
Kernel updates for x86_64 architectures.
Summary of Contents for ENTERPRISE 5.4 RELEASE NOTES
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