On Wed, 23 Feb 2005 01:51:27 +0100, Wolfgang Solfrank wrote:
> Hi,
> 
> >Running -current from about a week ago on an evbarm board (IQ31244) a 
> >build of libgcj.so (from gcc 4 sources) is dying with the error:
> >
> >	sbrk: grow 16384 failed, error = 12
> >
> >Any clues as to why?  It's not the overall process size (I've upped the 
> >data segment size to 1GB and it's not getting anywhere near that).  It 
> >seems that it's running out of free pages (ie isn't swapping pages out 
> >fast enough to satisfy demand), but why isn't it just waiting for more to 
> >become available?
> >
> >Is there a sysctl I can tweak to up fmin and ftarg?
> 
> Hmm, since I just looked into this on the amd64 platform, it's almost
> certainly a problem with the kernel running out of virtual memory.
> Our VM system uses quite some memory for housekeeping, at least
> 16 bytes per page on 32-bit machines plus the machine dependent stuff.
> While I thought that this would mostly be a problem on 64-bit machines
> (with its much larger address space, but until now similar kernel virtual
> memory limits), your mail seems to indicate that at least some 32-bit
> boxes have similar problems.
> 

I've bumped NKMEMPAGES to give me 16M of kvm space (was previously 7M), 
and it seems to have solved the problem, but I need to do some more 
testing.

Thanks,

R.