kern.maxdsiz on amd63 with i386 binaries

Chris Peterson chris at
Fri Oct 24 21:59:25 PDT 2008

Thanks Joe, that did it.

Out of curiosity, I don't see any of the compat tree in /boot/defaults/ 
loader.conf, is there any place this is documented besides kernel  
sources? If not then I guess I should give something back to the  
community and change that :)

Chris Peterson

On Oct 24, 2008, at 9:03 PM, Joe Marcus Clarke wrote:

> Chris Peterson wrote:
>> Hello,
>> I've got a handful of i386 boxes, and a handful of amd64 boxes  
>> running a
>> 32-bit application, the reasons for this exact configuration  
>> mystify me
>> as well as the deployment predates my time in the environment. Now  
>> that
>> the dataset the application is loading is rapidly approaching 512MB
>> we're starting to tweak kern.maxdsiz and kern.dfldsiz to 1GB.
>> The i386 boxes are doing great, but we hit an issue with the amd64
>> machines in that 64bit apps seem to work fine, but the 32bit apps
>> running on the amd64 machines fail to be able to use more than the  
>> i386
>> default of 512MB no matter what we set kern.maxdsiz to. I've also  
>> tried
>> compiling it into the kernel, which results in the same issue.
>> I tried starting the app with "limits -d 1090519040", and it seems to
>> fail as well. Limits does show the proper value for datasize of  
>> 1064960 kB.
>> We're locked into 32-bit binaries for this app at the moment thanks  
>> to
>> some uh... interesting libraries it uses, so the usual option of
>> recompile isn't available. I'd like to avoid traveling from San  
>> Jose to
>> Seattle, then Virginia, then Munich to reinstall the amd64 machines  
>> with
>> i386 machines if at all possible.
>> Uh... help?
> Have you tried setting compat.ia32.maxdsiz?  I believe this will do  
> what
> you want.
> Joe
> -- 
> Joe Marcus Clarke
> FreeBSD GNOME Team	::	gnome at
> FreeNode / #freebsd-gnome

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