bba7f4d4d0
Resolves: https://issues.redhat.com/browse/RHEL-77215 Upstream: kdump-utils Conflict: manually apply commit 4f7970eefa6cba5d7cebd739718fb947a3fedbad (HEAD -> main, origin/main, origin/HEAD) Author: Sourabh Jain <sourabhjain@linux.ibm.com> Date: Thu Dec 4 13:51:21 2025 +0530 powerpc: Set nr_cpus=16 for kdump kernel Configure the kdump kernel with nr_cpus=16 to enable multi-threading in the makedumpfile core collector, allowing faster dump collection. Commit d428557fc2b59 ("Use all available CPUs to collect dump") introduced multi-threading support in the core collector. There are two reasons for choosing nr_cpus=16: - Multiple experiments show that optimal performance is achieved when nr_cpus is between 16 and 30. The graph in commit d428557fc2b59 supports this. - nr_cpus=16 is already used for the fadump kernel, so using the same value for kdump to maintain consistency. Signed-off-by: Sourabh Jain <sourabhjain@linux.ibm.com> Since there is no gen-kdump-sysconfig.sh in RHEL-9 kexec-tools, and the patch just change the nr_cpus from 1 to 16, so apply it manually. Signed-off-by: Pingfan Liu <piliu@redhat.com>
67 lines
3.0 KiB
Plaintext
67 lines
3.0 KiB
Plaintext
# Kernel Version string for the -kdump kernel, such as 2.6.13-1544.FC5kdump
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# If no version is specified, then the init script will try to find a
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# kdump kernel with the same version number as the running kernel.
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KDUMP_KERNELVER=""
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# The kdump commandline is the command line that needs to be passed off to
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# the kdump kernel. This will likely match the contents of the grub kernel
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# line. For example:
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# KDUMP_COMMANDLINE="ro root=LABEL=/"
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# Dracut depends on proper root= options, so please make sure that appropriate
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# root= options are copied from /proc/cmdline. In general it is best to append
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# command line options using "KDUMP_COMMANDLINE_APPEND=".
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# If a command line is not specified, the default will be taken from
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# /proc/cmdline
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KDUMP_COMMANDLINE=""
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# This variable lets us remove arguments from the current kdump commandline
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# as taken from either KDUMP_COMMANDLINE above, or from /proc/cmdline
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# NOTE: some arguments such as crashkernel will always be removed
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KDUMP_COMMANDLINE_REMOVE="hugepages hugepagesz slub_debug quiet log_buf_len swiotlb hugetlb_cma ignition.firstboot"
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# This variable lets us append arguments to the current kdump commandline
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# after processed by KDUMP_COMMANDLINE_REMOVE
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KDUMP_COMMANDLINE_APPEND="irqpoll nr_cpus=16 noirqdistrib reset_devices cgroup_disable=memory numa=off udev.children-max=2 ehea.use_mcs=0 panic=10 kvm_cma_resv_ratio=0 transparent_hugepage=never novmcoredd hugetlb_cma=0 kfence.sample_interval=0"
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# This variable lets us append arguments to fadump (powerpc) capture kernel,
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# further to the parameters passed via the bootloader.
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FADUMP_COMMANDLINE_APPEND="nr_cpus=16 numa=off cgroup_disable=memory cma=0 kvm_cma_resv_ratio=0 hugetlb_cma=0 transparent_hugepage=never novmcoredd udev.children-max=2 kfence.sample_interval=0"
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# Any additional kexec arguments required. In most situations, this should
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# be left empty
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#
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# Example:
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# KEXEC_ARGS="--elf32-core-headers"
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KEXEC_ARGS="--dt-no-old-root -s"
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#Where to find the boot image
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#KDUMP_BOOTDIR="/boot"
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#What is the image type used for kdump
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KDUMP_IMG="vmlinuz"
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#What is the images extension. Relocatable kernels don't have one
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KDUMP_IMG_EXT=""
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# Enable vmcore creation notification by default, disable by setting
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# VMCORE_CREATION_NOTIFICATION=""
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VMCORE_CREATION_NOTIFICATION="yes"
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#Specify the action after failure
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# Logging is controlled by following variables in the first kernel:
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# - @var KDUMP_STDLOGLVL - logging level to standard error (console output)
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# - @var KDUMP_SYSLOGLVL - logging level to syslog (by logger command)
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# - @var KDUMP_KMSGLOGLVL - logging level to /dev/kmsg (only for boot-time)
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#
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# In the second kernel, kdump will use the rd.kdumploglvl option to set the
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# log level in the above KDUMP_COMMANDLINE_APPEND.
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# - @var rd.kdumploglvl - logging level to syslog (by logger command)
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# - for example: add the rd.kdumploglvl=3 option to KDUMP_COMMANDLINE_APPEND
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#
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# Logging levels: no logging(0), error(1),warn(2),info(3),debug(4)
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#
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# KDUMP_STDLOGLVL=3
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# KDUMP_SYSLOGLVL=0
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# KDUMP_KMSGLOGLVL=0
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