3001788f4c
'maxcpus' setting normally don't work on several kdump enabled systems due to a known udev issue. Currently the fedora kdump configuration is set as the following on the aarch64 systems: # cat /etc/sysconfig/kdump <..snip..> # This variable lets us append arguments to the current kdump # commandline after processed by KDUMP_COMMANDLINE_REMOVE # KDUMP_COMMANDLINE_APPEND="irqpoll maxcpus=1 reset_devices" <..snip..> Since the 'maxcpus' setting doesn't limit the number of SMP CPUs, so the kdump kernel still boots with all CPUs available on the system. For e.g on the qualcomm amberwing its 46 CPUs: # lscpu Architecture: aarch64 Byte Order: Little Endian CPU(s): 46 On-line CPU(s) list: 0-45 Thread(s) per core: 1 Core(s) per socket: 46 Socket(s): 1 NUMA node(s): 1 Vendor ID: Qualcomm Model: 1 Model name: Falkor Stepping: 0x0 CPU max MHz: 2600.0000 CPU min MHz: 600.0000 BogoMIPS: 40.00 L1d cache: 32K L1i cache: 64K L2 cache: 512K L3 cache: 58880K NUMA node0 CPU(s): 0-45 Flags: fp asimd evtstrm aes pmull sha1 sha2 crc32 cpuid asimdrdm This causes the memory consumption in the kdump kernel to swell up and we can end up having OOM issues in the kdump kernel boot. Whereas if we use 'nr_cpus=1' in the bootargs, the number of SMP CPUs in the kdump kernel get limited to 1. The 'swiotlb=noforce' setting in bootargs provide us extra guarding, to ensure the crash kernel size requirements do not swell on systems which support swiotlb. With the above settings, crashkernel boots properly (without OOM) on all the aarch64 boards I could test on - qualcomm amberwings, hp-moonshots and hpe-apache (thunderx2) for crash dump saving on local disk. Signed-off-by: Bhupesh Sharma <bhsharma@redhat.com> Acked-by: Pingfan Liu <piliu@redhat.com>
38 lines
1.5 KiB
Plaintext
38 lines
1.5 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"
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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=1 swiotlb=noforce reset_devices"
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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=""
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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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