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[PATCH] Documentation: Update the default value of crashkernel low

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  [PATCH] Documentation: Update the default value of crashkernel low Baoquan He <bhe@redhat.com> - 2015-09-24 11:00 +0200
    Re: [PATCH] Documentation: Update the default value of crashkernel  low Jonathan Corbet <corbet@lwn.net> - 2015-09-24 23:50 +0200
      Re: [PATCH] Documentation: Update the default value of crashkernel  low Baoquan He <bhe@redhat.com> - 2015-09-25 05:40 +0200

#1231954 — [PATCH] 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>
---
 Documentation/kernel-parameters.txt | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 22a4b68..945bc0d 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.
-- 
2.1.0

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#1232450 — Re: [PATCH] Documentation: Update the default value of crashkernel low

On Thu, 24 Sep 2015 16:51:25 +0800
Baoquan He <bhe@redhat.com> wrote:

> 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.

Applied to the docs tree, thanks.

jon
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#1232553 — Re: [PATCH] Documentation: Update the default value of crashkernel low

On 09/24/15 at 03:44pm, Jonathan Corbet wrote:
> On Thu, 24 Sep 2015 16:51:25 +0800
> Baoquan He <bhe@redhat.com> wrote:
> 
> > 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.
> 
> Applied to the docs tree, thanks.

Thanks, Jon.

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