splice with centos6?

[Chris Burroughs]

Using 1.4.24 without USE_LINUX_SPLICE=1 results in an error when setting 
'defaults option splice-auto', and maxpipes is reported as zero.  This 
makes sense.

With USE_LINUX_SPLICE=1 I get maxpipes == maxconn/4 as the docs say. 
However, "current pipes" is always listed as 0/0, even under load.  Does 
that mean that splice is not working (or not being used)?  Is there a 
way to confirm splice it is working besides that metric?

This is centos6 so it's kernel 2.6.32 + crazy RedHat stuff 
(2.6.32-358.23.2.el6.x86_64).