attendees for facetoface submiting data problem

Hi,

I think that data that is submited from a url like this is too big for apache maybe:

/moodle/mod/facetoface/attendees.php?s=1471&takeattendance=1

i try to change some values in php.ini but with no success, as i notice it seems to update data only for ~200 persons.

I'am using moodle vers 1.9.6+

is any setting in moodle that need to be done to submit all 500 persons?

Thanks,

Daniel