SANTA CLARA — Aldon Smith hasn't had a sack for the past four games but 49ers defensive coordinator Vic Fangio is not concerned. "I don't look at it as a drought," Fangio said Thursday. "You guys were at the game last week. The guy (Packers quarterback Aaron Rodgers) was throwing the ball extremely fast." Smith racked up a franchise-record 19½ sacks through the first 13 games and finished second in the league behind the Houston Texans' J.J. Watt.