Red Hat ENTERPRISE LINUX 5.4 - TECHNICAL NOTES Manual page 157

• This update adds support for the connlimit module to limit to the number of TCP connections
accepted by specific ports. This feature reduces the risk of incidental DoS scenarios.
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• This update modifies the DASDFMT (Direct Access Storage Device ForMaT) command to operate
in the same way as similar IBM tools (such as CPFMTXA for zLinux/VM and ICKDSF for MVS)..
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• This feature includes stability enhancements to the CPU hotplug kernel module.
• When using previous x86_64 Xen kernels installed on Promise internal RAID disk the SuperTrak EX
(stex) inbox-driver would fail, causing a kernel panic and failure to load. The cause was found to
be the allocation of contiguous memory space. Relevant code sections have been rewritten to lower
the amount of memory demanded by the driver (Note: This reduces the RAID Migration feature set).
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Note
Lowering memory demands reduces the RAID Migration feature set.
• Infiniband driver updates, incorporated with the OFED 1.4.1 release upgrade, have rectified poor
TCP transer rate performance when running Infiniband IPoIB in heterogeneous environments (that
is, between Intel 32bit to PPC64bit or similar).
• This update adds support for machines using Intel®'s Calpella chipset.
• This update includes a patch to fix an interrupt storm (several thousand interrupts) encountered after
boot with CD/DVD drive connected to IDE of Enterprise South Bridge 2 (ESB2).
• Pre-release testing has assessed the ipr and iprutil drivers as supporting the SAS paddle card
on pBlade extensions.
• An upstream change to the e1000 and bnx2 driver removed the functionality to generate entropy,
causing applications requesting random data from /dev/random to hang or produce an error
message. This update reintroduces the functionality.
• Problems with ioctl SG_IO calls to tape devices failing have been resolved with an upstream
patch that address this and numerous other iscsi module issues.
• An update in this release changes page locking code to avoid a deadlock between mmap/munmap
and journaling (ext3).
• This kernel release includes a bug to correct a crash encountered when attempting to format a DVD
in a system booted to run libata and ata-piix IDE accelerators.
• This update includes a fix to prevent para-virtualized guest systems crashing when run in a host
machine with 64G RAM or more.
• Patches from the upstream kernel that improve gettimeofday performance on hypervisors have
been incorporated in this release. With these changes serialization for gettimeofday is switched
from CPUID to MFENCE/LFENCE.
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(BZ#448115
(BZ#448588
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(BZ#440411
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RHSA-2009:1243
(BZ#485412
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(BZ#438979
)
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)
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