problems in kdump kernel if 'maxcpus=1' not specified?

[Jay Lan]

Are there known problems if you boot up kdump kernel with
multipl cpus?

It takes unacceptably long time to run makedumpfile in
saving dump at a huge memory system. In my testing it
took 16hr25min to run create_dump_bitmap() on a 1TB system.
Pfn's are processed sequentially with single cpu. We
certainly can use multipl cpus here ;)

Regards,
 - jay