running out of I/O threads

Jan 7 14:37:15 router squid[637]: aio_queue_request: WARNING - Running
out of I/O theads
Jan 7 14:37:15 router squid[637]: aio_queue_request: Perhaps you should
increase NUMTHREADS
Jan 7 14:37:15 router squid[637]: aio_queue_request: Or install more
disks to share the load

since NUMTHREADS is a compile-time #define, I guess, it was not originally
meant to be settable... any ideas what might cause this and what are the
effects of this problem ?
I have glibc 2.0.7

-- 
Madarasz Gergely           gorgo@sztaki.hu           gorgo@linux.rulez.org
     It's practically impossible to look at a penguin and feel angry.
         Egy pingvinre gyakorlatilag lehetetlen haragosan nezni.
                   HuLUG: http://mlf.linux.rulez.org/