Hi Eric, and all, On Mon, Sep 24, 2012 at 08:11:12PM -0700, Eric W. Biederman wrote: > Cliff Wickman <cpw at sgi.com> writes: > > > Gentlemen, > > > > In dumping very large memories we are running up against the 896MB > > limit in SLES11SP2 (3.0.38 kernel). > > Odd. That limit should be the maximum address in memory to load the > crash kernel. Tha limit should have nothing to do with the dump process > itself. > > Are you saying you need more that 512MiB reserved for the crash kernel > to be able to dump all of the memory in your system? > > Eric As I noted to Eric privately, yes we need to bump up to crashkernel=1G or more for some very large memories. As an experiment I bumped +++ linux/arch/x86/kernel/setup.c @@ -528,7 +528,7 @@ static inline unsigned long long get_tot #ifdef CONFIG_X86_32 # define CRASH_KERNEL_ADDR_MAX (512 << 20) #else -# define CRASH_KERNEL_ADDR_MAX (896 << 20) +# define CRASH_KERNEL_ADDR_MAX (1700 << 20) And that seems to work. i.e. I'm currently dumping a system where crashkernel=1G and it seems to be working. Am I just living dangerously? -Cliff -- Cliff Wickman SGI cpw at sgi.com (651) 683-3824
