On 01/24/2017 at 02:14 AM, Borislav Petkov wrote: > On Mon, Jan 23, 2017 at 10:01:53AM -0800, Luck, Tony wrote: >> will ignore the machine check on the other cpus ... assuming >> that "cpu_is_offline(smp_processor_id())" does the right thing >> in the kexec case where this is an "old" cpu that isn't online >> in the new kernel. > Nice. And kdump did do the dumping on one CPU, AFAIR. So we should be > good there. > "nr_cpus=N" will consume more memory, using very large N is almost impossible for kdump to boot with considering the limited crash memory reserved. For some large machine, nr_cpus=1 might not be enough, we have to use nr_cpus=4 or more, it is also helpful for the vmcore parallel dumping :-) Regards, Xunlei
