Messages in this thread | | | Date | Fri, 21 Mar 2008 14:43:08 -0700 | From | "Yinghai Lu" <> | Subject | Re: [PATCH] x86_64: early memtest to find bad ram |
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On Fri, Mar 21, 2008 at 2:22 PM, Jan Engelhardt <jengelh@computergmbh.de> wrote: > > On Mar 21 2008 13:03, Ingo Molnar wrote: > > * Yinghai Lu <yhlu.kernel.send@gmail.com> wrote: > > > >> do simple memtest after init_memory_mapping > >> use find_e820_area_size to find all ram range that is not reserved. > >> and do some simple bits test to find some bad ram. > >> if find some bad ram, use reserve_early to exclude that range. > > > > very nice patch! I always thought that this was the proper way to do > > memtest - and we could in fact also do something like this after SMP > > bringup, and hit the memory bus via multiple CPUs. [that will need a > > different enumeration though than e820 maps] > > Perhaps this can even be used to provide on-the-fly badram > patch semantics?
yes. but bad ranges can not be too many. otherwise early_res array will overflow. then need to use memmap=nn$ss to exclude range already found.
YH
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