Performance of the ATLAS tau trigger in p-p collisions at \sqrt{s}=900 GeV

This note describes the analysis of the tau trigger related variables, using data collected with the ATLAS detector at $\sqrt{s} = 900$ GeV. The performance of the level 1 (L1) and the high level trigger (HLT) is compared between data and Monte Carlo (MC). The HLT includes both level 2 (L2) and event filter (EF). During 2009 data taking, only the L1 conditions were required online while the HLT was run in monitoring mode.