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    SubjectRe: [PATCH v2] Do not reserve crashkernel high memory if crashkernel low memory reserving failed
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    On Tue, Jul 21, 2015 at 1:58 AM, Baoquan He <bhe@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 <jroedel@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


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