Los Angeles City computers experienced a 20 percent spike in Internet traffic yesterday, coming from the NBC4 Internet site that's streaming the London Olympics. Randi Levin, the head of Information Technology, sent city employees a brief email "respectfully" requesting that they "discontinue" watching the games. Councilwoman Jan Perry, who's running for Mayor, has a different idea. She's asked Levin to block the transmission "immediately." Richie Duchon reports for the City News Service.