35 lines
1.4 KiB
Diff
35 lines
1.4 KiB
Diff
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From: Petr Tesarik <ptesarik@suse.com>
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Date: Tue, 25 Sep 2018 09:23:04 +0200
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Subject: Turn off NUMA in the kdump kernel
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References: bsc#1109784, bsc#1102609
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Upstream: merged
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Git-commit: 4c0e78b9923f0dbba3ad1bacc2336d91f7b520e5
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On NUMA systems, the crashkernel reserved region may get allocated
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on a different node than the low region (memory below 4G). With NUMA
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optimization turned on, the kernel will prefer node-local pages for
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all page allocations, which may unnecessarily deplete the DMA and
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DMA32 regions with data that could be allocated from the Normal
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zone (which is on a remote node).
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It makes little sense to address this corner case in the memory
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management system, because nobody would build a machine with almost
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all memory on a remote node. So, instead, let's turn off NUMA for
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kdump and accept the potential performance hit.
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Signed-off-by: Petr Tesarik <ptesarik@suse.com>
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---
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init/load.sh | 1 +
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1 file changed, 1 insertion(+)
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--- a/init/load.sh
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+++ b/init/load.sh
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@@ -73,6 +73,7 @@ function build_kdump_commandline()
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fi
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# Use deadline for saving the memory footprint
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commandline="$commandline elevator=deadline sysrq=yes reset_devices acpi_no_memhotplug cgroup_disable=memory nokaslr"
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+ commandline="$commandline numa=off"
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commandline="$commandline irqpoll ${nr_cpus}"
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commandline="$commandline root=kdump rootflags=bind rd.udev.children-max=8"
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case $(uname -i) in
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