PokerStars No-Limit Hold'em Tourney, Big Blind is t30 (6 handed) converter

Hero (t1345)
CO (t3595)
Button (t1815)
SB (t1835)
BB (t1520)
UTG (t3390)

Preflop: Hero is MP with T[img]/images/graemlins/diamond.gif[/img], T[img]/images/graemlins/club.gif[/img].
<font color="#666666">1 fold</font>, <font color="#CC3333">Hero raises to t90</font>, <font color="#666666">2 folds</font>, <font color="#CC3333">SB raises to t315</font>, <font color="#666666">1 fold</font>, Hero...

Was 3XBB enough of a raise?
Once reraised, what should I do?