kdump: quad core Opteron

[Neil Horman]

On Mon, Dec 08, 2008 at 04:35:16PM -0700, Bob Montgomery wrote:
> On Mon, 2008-12-08 at 15:56 +0000, Chandru wrote:
> 
> > Hi Bob,
> > 
> > This problem was recently reported on a LS42 blade and the patch given by you
> > also resolved the issue here too.  However I made couple of changes to
> > kexec-tools to ignore GART memory region and not have elf headers created to
> > it.  This patch also seemed to work on a LS21.
> > 
> > Thanks,
> > Chandru
> 
> Hi Chandru,
> 
> I tried your patch on kexec-tools, and I'm seeing a zero-length section
> in /proc/vmcore (using readelf -e /proc/vmcore) right after the GART
> hole:
> 
> /proc/iomem in the main kernel shows:
>   01000000-08ffffff : Crash kernel 
>   20000000-23ffffff : GART
> cfe4e000-cfe55fff : ACPI Tables
> 
> And readelf -e /proc/vmcore in the kdump kernel shows:
> 
> Program Headers:
>   Type           Offset             VirtAddr           PhysAddr
>                  FileSiz            MemSiz              Flags  Align
> ...
>   LOAD           0x000000000144d99c 0xffff810009000000 0x0000000009000000
>                  0x0000000017000000 0x0000000017000000  RWE    0
>   LOAD           0x000000001844d99c 0xffff810024000000 0x0000000024000000
>                  0x00000000abe4e000 0x00000000abe4e000  RWE    0
>   LOAD           0x00000000c429b99c 0xffff810024000000 0x0000000024000000
>                  0x0000000000000000 0x0000000000000000  RWE    0
> ...
> 
> The first LOAD shown covers 09000000-20000000, the System RAM between
> the Crash kernel and the GART.  
> The next LOAD covers 24000000-cfe4e000, which is the System RAM between
> the GART and the ACPI Tables.  So that all looks good.
> 
> Then the next LOAD is also at 24000000 with a 0 in the size fields.
> I haven't had a chance to check the code yet.
> 
> Bob Montgomery
> 
Seems like something we can work out pretty easily.  Did crash choke on this at
all?

Neil

> 
> 
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-- 
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 *Neil Horman
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 *Red Hat, Inc.
 *nhorman at redhat.com
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