On 09/19/16 at 12:01pm, Baoquan He wrote: > From: Zhou Wenjian <zhouwj-fnst@xxxxxxxxxxxxxx> > > 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@xxxxxxxxxxxxxx> > Acked-by: Baoquan He <bhe@xxxxxxxxxx> > Acked-by: Xunlei Pang <xpang@xxxxxxxxxx> > Signed-off-by: Baoquan He <bhe@xxxxxxxxxx> 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 > -- > 2.5.5 > -- To unsubscribe from this list: send the line "unsubscribe linux-doc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
