This fine Tuesday, IBM reported its fourth-quarter financial performance and was greeted with raspberries from investors with period revenue of $27.7 billion and earnings per share excluding items of $6.13. Using GAAP, IBM earned $6.2 billion, or $5.73. Off nearly a percent in regular trading, IBM eased another 2.5 percent in after-hours trading. Investors had expected IBM to earn revenue of $28.25 billion and non-GAAP earnings per share of $5.99.