Woah! I upgraded the kernel to 2.6.32 (yeah, I'm a little behind) on my ancient server, which uses an ASUS P2B-DS dual CPU motherboard, and noticed Linux is only using one CPU! Here's the embarrassing part. It appears this problem was introduced in 2.6.28 which means the server has been running on one CPU for months. Obviously I dropped the ball on that one. ;_;
At least I'm not the only one. It seems nobody else noticed until now either. The regression has only just been fixed in 2.6.33, which was only released a few days ago. It has not been packaged on Debian yet, but the server ran this long without my noticing the problem, so I guess I can live with it for a few more days.
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