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authorBaoquan He <bhe@redhat.com>2015-09-24 11:51:25 +0300
committerJonathan Corbet <corbet@lwn.net>2015-09-25 00:44:19 +0300
commitc604503192718b9676a0ef5dd104b6a8acef8278 (patch)
treec682311ddbfc67af4697f3dd3d3cdc7a8cdf211f
parent3657c20d8277e7ee50a26ac9cacad55a8bba901d (diff)
downloadlinux-c604503192718b9676a0ef5dd104b6a8acef8278.tar.xz
Documentation: Update the default value of crashkernel low
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 <bhe@redhat.com> Signed-off-by: Jonathan Corbet <corbet@lwn.net>
-rw-r--r--Documentation/kernel-parameters.txt6
1 files changed, 4 insertions, 2 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 22a4b687ea5b..945bc0de7f07 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -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.