On Tue, Jul 21, 2015 at 1:58 AM, Baoquan He <b...@redhat.com> wrote: > Maybe system which don't need low memory is rare, only for testing?
No, it is not rare. All recent intel based systems with iommu support does not need low. And those systems get punished by following patch: | commit 94fb9334182284e8e7e4bcb9125c25dc33af19d4 | Author: Joerg Roedel <jroe...@suse.de> | Date: Wed Jun 10 17:49:42 2015 +0200 | | x86/crash: Allocate enough low memory when crashkernel=high that reserve 256M low always. and those 256M get wasted. That commit should only be used to workaround some systems that have partial iommu support. Yinghai -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
