Red Hat ENTERPRISE LINUX 5.5 - S 2010, Manual

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These updated packages add the following enhancements:
• Support for migration and image compatibility between Red Hat Enterprise Linux 5.4.4 and Red Hat
Enterprise Linux 5.5 hosts. (
BZ#553187
1320
and
BZ#557327
1321
)
• The KVM hypervisor does not accept
MSR_KERNEL_GS_BASE
intercept calls for Windows Server
2008 guests. This improves performance of Windows Server 2008 guests under heavy loads.
(
BZ#488130
1322
)
• qcow2 now uses 64Kb as the default block cluster size instead of 4Kb blocks which improves
performance for guests using qcow2. (
BZ#502809
1323
)
• Various unsupported features of the
qemu-kvm
command are now compiled out of the kvm
pacakges. (
BZ#516672
1324
)
• Support for migration from older hypervisors which use versions of savevm with additional fields
which are not supported by newer versions. This feature is required for migrations from older
hypervisors to newer versions of KVM. (
BZ#541731
1325
)
• Significantly improved performance of
qcow2
devices using the
cache=off
parameter.
(
BZ#518169
1326
)
• Support for guest access to advanced CPU extensions, including: SSE4.1, SSE4.2 and SSE4a.
(
BZ#518090
1327
)
• SMBIOS table 4 data is now generated for Windows guests. (
BZ#537178
1328
)
• The cache flushing command was changed from
fsync
to
fdatasync
. This allows write caches
to be exposed to guests and allows the guest to request for flushing I/O buffers. This improves I/O
performance for some guests. (
BZ#537646
1329
)
• KVM can now use gPXE or
etherboot
roms stored in the
/usr/share/qemu-pxe-roms
directory. (
BZ#546019
1330
and
BZ#550053
1331
)
• Support for changing the file format of an in-place backing file. (
BZ#530134
1332
)
• Support for Red Hat Enterprise Linux 3.9 guests running the para-virtualized drivers.
(
BZ#536749
1333
)
• The QXL driver now supports setting resolutions of 1024x576 and 1024x600. (
BZ#552240
1334
)
All KVM users should upgrade to these updated packages, which resolve this issue as well as fixing
the bugs and adding the enhancements noted in the Technical Notes. Note: The procedure in the
Solution section must be performed before this update will take effect.
1.95. less
1.95.1. RHBA-2010:0214: bug fix and enhancement update
A re-based less package that also fixes two bugs is now available.
The less utility is a text file browser that resembles more, but with more capabilities ("less is more").
The less utility allows users to move backwards in the file as well as forwards. Because less need not
read the entire input file before it starts, less starts up more quickly than text editors (vi, for example).