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Documentation: Update the default value of crashkernel low

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In commit 94fb933 ("x86/crash: Allocate enough low memory when
crashkernel=high") the default value of crashkernel low memory
is changed to 256M. In this patch update it accordingly.

Signed-off-by: Baoquan He <[email protected]>
Signed-off-by: Jonathan Corbet <[email protected]>
This commit is contained in:
Baoquan He 2015-09-24 16:51:25 +08:00 • committed by Jonathan Corbet
commit c604503192
1 changed files with 4 additions and 2 deletions
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6
Documentation/kernel-parameters.txt
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@ -789,8 +789,10 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
is passed, kernel could allocate physical memory region
above 4G, that cause second kernel crash on system
that require some amount of low memory, e.g. swiotlb
requires at least 64M+32K low memory. Kernel would
try to allocate 72M below 4G automatically.
requires at least 64M+32K low memory, also enough extra
low memory is needed to make sure DMA buffers for 32-bit
devices won't run out. Kernel would try to allocate at
at least 256M below 4G automatically.
This one let user to specify own low range under 4G
for second kernel instead.
0: to disable low allocation.