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Bug ID
Description
■ SUSE Linux Enterprise Server (SLES) 10 SP4
Workaround:
This issue has been fixed in SLES 11 SP1 XEN kernel; however, there is no workaround for this
issue in SLES 10 SP4 XEN kernel.
15761043
SLES 11 SP1 XEN and Oracle VM 3.x might report map_irq failed.
Issue:
SLES 11 SP1 XEN and Oracle VM might report map irq failed.
Affected Operating System and Software:
■ SUSE Linux Enterprise Server (SLES) 11 SP1
■ Oracle VM 3.x
Workaround:
Add the following to the kernel line of the GRUB file: extra_guest_irqs=64,2048 nr_irqs=2048
15636521
Oracle Linux 5.5, RHEL 5.5, and SLES 11 SP1 allow only a limited number of interrupt
vectors.
Issue:
Certain hardware configurations that include many high bandwidth I/O cards with drivers that use
multiple MSI vectors per instance might cause the kernel to run out of interrupts. This situation
might result in a long pause or system hang at boot time or I/O devices that are unusable due to
driver instances unable to get required interrupts. This situation is especially likely to occur for the
Xen Hypervisor and Dom0 with multiple InfiniBand and 10GbE network cards using SR-IOV, but is
also possible on the SMP kernel.
Affected Operating Systems:
■ Oracle Linux 5.5
■ Red Hat Enterprise Linux (RHEL) 5.5
■ SUSE Linux Enterprise Server (SLES) 11 SP1
Workaround:
Booting with kernel argument pci=nomsi allows the system to boot with no long pause in UDEV and
no system hang. However the system is forced to use a single IO-APIC PIN interrupt per function.
If you need MSI instead of IO-APIC interrupts, then you might need to use some combination of the
following methods to alleviate the problem:
■ Blacklist some drivers by adding the module name to the text file /etc/modprobe.d/blacklist.
This prevents the module from loading and using the device.
■ Force certain drivers (such as mlx4_core : infiniband) to load last, and take advantage of the code
in those drivers that asks for optimal MSI number of vectors. If those vectors are not available,
retry with increasingly fewer number of vectors.
Oracle Linux 5.6 fails to allocate memory space on onboard Intel 82576 network interface card
15718589
(NIC) ports.
Chapter 1 • Sun Server X2-4 Product Notes
Known Open Issues
43
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