mlock(2) results in Resource temporarily unavailable on FreeBSD/amd64 9.0-STABLE

[Trond Endrestøl]

On Thu, 16 Feb 2012 09:47+0100, Trond Endrestøl wrote:

> I have a system running FreeBSD/amd64 9.0-STABLE as of 
> Tue Jan 10 16:22:34 CET 2012.
> 
> Every attempt by the root user to use the mlock(2) system call results 
> in Resource temporarily unavailable (EAGAIN, 35).
> 
> I'm using bash and ulimit -l says there's no restriction on the amount 
> of locked memory:
> 
> root at hostname:~>ulimit -l
> unlimited
> 
> Is this typical for the amd64 arch? Is this documented somewhere?
> The mlock(2) system call works as expected on the i386 arch.

The system is question is running ZFS at full steam, and the ARC might 
be to blame as nearly all physical memory is placed in the Wired 
category:

Mem: 97M Active, 188M Inact, 7175M Wired, 193M Cache, 400K Buf, 249M Free

This system has:

real memory  = 8589934592 (8192 MB)
avail memory = 8234950656 (7853 MB)

The solution might be to decrease vfs.zfs.arc_max from 7216345088 to a 
more sane number like 4096M.

> GnuPG and other software would benefit from a useable mlock(2) on 
> the amd64 arch.


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