
Release Notes
24
5. Kernel-Related Notes
5.1. All Architectures
•
relayfs
previously had a buffer size limit of 64MB. In this update, the limitation of the memory
allocated to relayfs for on-memory buffers has been increased to 4095MB. This allows
SystemTap
and other tracing tools that utilize
relayfs
the ability to trace more events.
• The driver for
Dell Remote Access Controller 4
(DRAC4) was not present. Consequently,
any virtual devices provided by the DRAC4 were not being detected by the kernel. In this update,
the pata_sil680 kernel module that provides the appropriate driver has been added, which resolves
this issue.
• The message buffers for the relay interface were only allocated for online CPUs when
relay_open()
was called. Consequently, if an off-line CPU was turned on after
relay_open()
was called, a kernel panic would occur. In this update, a new message buffer is allocated
dynamically if any new CPUs are added.
• The driver for 8250 based serial ports has been updated to add support for DSR/DTR hardware flow
control.
• Support for
Dell Wireless Wide Area Network (WWAN)
cards has been added to the kernel. Devices
that are now supported are:
• Dell Wireless 5700 Mobile Broadband CDMA/EVDO Mini-Card
• Dell Wireless 5500 Mobile Broadband HSDPA Mini-Card
• Dell Wireless 5505 Mobile Broadband HSDPA Mini-Card
• Dell Wireless 5700 Mobile Broadband CDMA/EVDO ExpressCard
• Dell Wireless 5510 Mobile Broadband HSDPA ExpressCard
• Dell Wireless 5700 Mobile Broadband CDMA/EVDO Mini-Card
• Dell Wireless 5700 Mobile Broadband CDMA/EVDO Mini-Card
• Dell Wireless 5720
• Dell Wireless HSDPA 5520
• Dell Wireless HSDPA 5520
• Dell Wireless 5520 Voda I Mobile Broadband (3G HSDPA) Mini-Card
• the
thinkpad_acpi
kernel module has been updated to provide enhanced support for newer
Thinkpad models.
• The soft lockup detector can now be configured to trigger a kernel panic instead of a warning
message. This makes it possible for users to generate and analyze a crash dump during a soft
lockup for forensic purposes.
To configure the soft lockup detector to generate a panic, set the kernel parameter
soft_lockup
to
1
. This parameter is set to
0
by default.
Summary of Contents for ENTERPRISE LINUX 5.3 - RELEASE MANIFEST
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