after further investigation, the sendfile() functionality was purportedly working as recently as 7/24, which would put versions at 2.2.9-5 (apache2.2) and 2.6.25-7 (linux-image). I verified this by looking through apache logs, and there was a datafile (which resides on a CIFS partition) downloaded on 7/24. The apache logs indicate a successful GET request (code 200) on 7/24. Although this doesn't confirm a complete download happened on 7/24, it reportely was complete.
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