linux32 sysctl limits?

Fri Oct 8 22:59:08 UTC 2010

On Fri, Oct 08, 2010 at 03:17:01PM -0700, Steve Kargl wrote:
> 'man linux' does not list or describe the following sysctl
> variables.
> 
> compat.linux32.maxvmem: 0
> compat.linux32.maxssiz: 67108864
> compat.linux32.maxdsiz: 536870912
> 
> Are there any limitations with setting these to
> say 1G for stack and 4G for data on a system with
> 16G of memory?

The linux ABI processes are 32bit, so you cannot reallistically assign
4Gb to maxdsiz. The space between data (bss) end and stack bottom is
used for mappings, so it should be kept large enough.
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