Red Hat ENTERPRISE 5.4 RELEASE NOTES, Manual

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RHSA-2009:1243
139
• 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.
(
BZ#483588
1036
)
• 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)..
(
BZ#484836
1037
)
• This feature includes stability enhancements to the CPU hotplug kernel module. (
BZ#485412
1038
)
• 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).
(
BZ#486466
1039
)
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). (
BZ#434779
1040
)
• This update adds support for machines using Intel®'s Calpella chipset. (
BZ#438469
1041
)
• 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). (
BZ#438979
1042
)
• Pre-release testing has assessed the
ipr
and
iprutil
drivers as supporting the SAS paddle card
on pBlade extensions. (
BZ#439566
1043
)
• 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. (
BZ#439898
1044
)
• 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. (
BZ#440411
1045
)
• An update in this release changes page locking code to avoid a deadlock between
mmap/munmap
and
journaling
(ext3). (
BZ#445433
1046
)
• 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. (
BZ#446086
1047
)
• This update includes a fix to prevent para-virtualized guest systems crashing when run in a host
machine with 64G RAM or more. (
BZ#448115
1048
)
• 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. (
BZ#448588
1049
)