lkml.org 
[lkml]   [2016]   [Aug]   [17]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH v7 2/2] Documentation: kdump: add description of enable multi-cpus support
From
Date
On 2016/08/18 at 09:50, Zhou Wenjian wrote:
> multi-cpu support is useful to improve the performance of kdump in
> some cases. So add the description of enable multi-cpu support in
> dump-capture kernel.
>
> Signed-off-by: Zhou Wenjian <zhouwj-fnst@cn.fujitsu.com>
> Acked-by: Baoquan He <bhe@redhat.com>
> ---
> Documentation/kdump/kdump.txt | 7 +++++++
> 1 file changed, 7 insertions(+)
>
> diff --git a/Documentation/kdump/kdump.txt b/Documentation/kdump/kdump.txt
> index 96da2b7..c93a6e0 100644
> --- a/Documentation/kdump/kdump.txt
> +++ b/Documentation/kdump/kdump.txt
> @@ -396,6 +396,13 @@ Notes on loading the dump-capture kernel:
> Note, though maxcpus always works, you should replace it by nr_cpus to
> save memory if supported by the current ARCH, such as x86.
>
> +* You should enable multi-cpu support in dump-capture kernel if you intend
> + to use multi-thread programs with it, such as parallel dump feature of
> + makedumpfile. Otherwise, the multi-thread program may have a great
> + performance degradation. To enable multi-cpu support, you should bring up
> + a SMP dump-capture kernel and specify maxcpus\nr_cpus, disable_cpu_apicid=[X]

s/a SMP/an SMP/
For "maxcpus\nr_cpus", I think to use slash instead of backslash in Linux is better.

Otherwise, looks good to me.

Regards,
Xunlei

> + options while loading it.
> +
> * For s390x there are two kdump modes: If a ELF header is specified with
> the elfcorehdr= kernel parameter, it is used by the kdump kernel as it
> is done on all other architectures. If no elfcorehdr= kernel parameter is

\
 
 \ /
  Last update: 2016-09-17 09:57    [W:0.045 / U:0.236 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site