Tracking down possible IO problem

hej guys,

ive got a nice new install, freebsd 8.x, with zfs onto sata hdd, core duo and lot of ram. sadly i encounter some problems i would call on a first guess IO delays. typical behavior is i try to open a xterm and it tooks like 1 second. this of course gets worse having a virtualbox running in the background or compiling something.

having a look at top reveals that i encounter those delays even on 100% idle of both cores. i ran several times iostat to get a clue of whats going on, but i'm not able to interpret the results.

somebody can tell me how to check for io?

regards,
 
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