lkml.org 
[lkml]   [2016]   [Aug]   [2]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: [PATCH v3 2/2] Documentation: kdump: add description of bringing up SMP dump-capture kernel
    On 08/03/16 at 08:59am, Zhou Wenjian wrote:
    > SMP dump-capture kernel is useful to improve the performance of kdump in
    > some cases. So add the description of bringing up SMP dump-capture kernel.
    >
    > Signed-off-by: Zhou Wenjian <zhouwj-fnst@cn.fujitsu.com>
    > ---
    > Documentation/kdump/kdump.txt | 7 +++++++
    > 1 file changed, 7 insertions(+)
    >
    > diff --git a/Documentation/kdump/kdump.txt b/Documentation/kdump/kdump.txt
    > index 4aa194e..948b42d 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, we should replace it by nr_cpus to
    > save memory if supported by the current ARCH, such as x86.
    >
    > +* We should bring up a SMP dump-capture kernel if we intend to use

    Well, here about SMP dump-capture kernel do you mean kdump kernel with
    multi-cpu? If I understand it correctly, it's still SMP kdump kernel
    though nr_cpus=1 is specified.

    > + multi-threads programs with it, such as parallel dump feature of
    > + makedumpfile. Otherwise, the multi-threads program may have a great
    > + performance degradation. To bring up a SMP dump-capture kernel, we
    > + should specify maxcpus\nr_cpus and disable_cpu_apic=[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
    > --
    > 1.8.3.1
    >
    >
    >
    >
    > _______________________________________________
    > kexec mailing list
    > kexec@lists.infradead.org
    > http://lists.infradead.org/mailman/listinfo/kexec

    \
     
     \ /
      Last update: 2016-08-03 04:41    [W:4.195 / U:0.372 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site