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Soft lockup errors when booting
When upgrading or installing the UEK R3 kernel on fast hardware, usually with SAN storage attached,
the kernel can fail to boot and BUG: soft lockup messages are displayed in the console log. The
workaround is to increase the baud rate from the default value of 9600 by amending the kernel boot line in
/boot/grub/grub.conf to include an appropriate console setting, for example:
console=ttyS0,115200n8
A value of 115200 is recommended as smaller values such as 19200 are known to be insufficient
for some systems (for example, see http://docs.oracle.com/cd/E19045-01/blade.x6220/820-0048-18/
sp.html#0_pgfId-1002490). If the host implements an integrated system management infrastructure, such
as ILOM on Sun and Oracle systems or iLO on HP systems, configure the integrated console baud rate
to match the setting for the host system. Otherwise, the integrated console is likely to display garbage
characters. (Bug ID 17064059, 17252160)
Transparent Huge Pages
This release removes the Transparent Huge Pages (THP) feature. Following extensive benchmarking
and testing, Oracle found that THP caused a performance degradation of between 5 and 10% for some
workloads. This performance degradation was a result of a slower memory allocator code path being used
even when the applications were not using THP. When the fact that huge pages are not swappable was
taken into account, the positive effect that THP should provide was outweighed by its negative effects.
After installing this UEK release, you cannot enable THP (for example, by specifying kernel boot
parameters). The THP settings under /sys/kernel/mm/transparent_hugepage have also been
removed. A future update might contain an updated THP implementation which resolves the performance
issue.
Note
This change does not affect support for applications that use explicit huge pages
(for example, Oracle Database).
(Bug ID 16823432)
User Namespaces
The kernel functionality (CONFIG_USER_NS) that allows unprivileged processes to create namespaces
for users inside which they have root privileges is not currently implemented because of a clash with the
implementation of XFS. This functionality is primarily intended for use with Linux Containers. As a result,
the lxc-checkconfig command displays User namespace: missing. (Bug ID 16656850)
Virtualization
• When booting UEK R3 as a PVHVM guest, you can safely ignore the following kernel message:
register_vcpu_info failed:
err=-38
(Bug ID 13713774)
• Under Oracle VM Server 3.1.1, migrating a PVHVM guest that is running the UEK R3 kernel causes
a disparity between the date and time as displayed by date and hwclock. The workaround post
migration is either to run the command hwclock --hctosys on the guest or to reboot the guest. (Bug
ID 16861041)
- Oracle® Linux 1
- Table of Contents 3
- Audience 5
- Documentation Accessibility 5
- Related Documents 5
- Conventions 5
- 1.1 Notable Changes 7
- # uname26 application 8
- # uname -r 8
- 3.8.13-16.el6uek.x86_64 8
- # uname26 uname -r 8
- 2.6.48-16.el6uek.x86_64 8
- # modprobe fasttrap 10
- 1.1.8 File Systems 12
- 1.1.9 Memory Management 13
- 1.1.10 Networking 14
- 1.1.11 Performance 14
- 1.1.12 Security 15
- 1.1.13 Storage 15
- 1.2 Xen Improvements 16
- 1.3 Driver Updates 17
- 1.3.2 Network Adapter Drivers 18
- 1.3.3 Miscellaneous Drivers 18
- 1.4 New and Updated Packages 19
- 1.5 Technology Preview 22
- 1.6 Compatibility 22
- Chapter 2 Known Issues 23
- 1, disabled 26
- Transparent Huge Pages 29
- User Namespaces 29
- Virtualization 29
- 3.1 Installation Overview 31
- 3.4 Upgrading OFED Packages 33
- 3.5 Upgrading Your System 33
- Appendix A Other Changes 35
- A.3 Core Kernel Functionality 36
- A.4 Cryptography 40
- A.5 Device Mapper 41
- A.6 Driver Support 41
- A.7 File Systems 42
- A.8 Memory Management 45
- A.9 Networking 46
- A.10 perf Utility 51
- A.11 Power Management 52
- A.12 Security 52
- A.13 Storage 53
- A.14 Virtualization 54
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