[PATCH v10 3/3] Documentation: kdump: add description of enable multi-cpus support
bhe at redhat.com
Sun Sep 18 22:52:57 PDT 2016
On 09/19/16 at 12:01pm, Baoquan He wrote:
> From: Zhou Wenjian <zhouwj-fnst at cn.fujitsu.com>
> 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 at cn.fujitsu.com>
> Acked-by: Baoquan He <bhe at redhat.com>
> Acked-by: Xunlei Pang <xpang at redhat.com>
> Signed-off-by: Baoquan He <bhe at redhat.com>
Oh, sorry. My git config caused this Signed-off-by adding automatically.
Will resend. Nack this patchset.
> Documentation/kdump/kdump.txt | 7 +++++++
> 1 file changed, 7 insertions(+)
> diff --git a/Documentation/kdump/kdump.txt b/Documentation/kdump/kdump.txt
> index f7ef340..b0eb27b 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 had better replace it with
> 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 an
> + SMP dump-capture kernel and specify maxcpus/nr_cpus, disable_cpu_apicid=[X]
> + 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
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