There are several movement enhancers used in sl military community, variously named dive roll or dodge roll. Since i scripted my own, so i have taken sometime to research other similar products, here's a short report.
https://www.xstreetsl.com/modules.php?name=Marketplace&file=item&ItemID=901273 Scripter: Poon Voom. (sold by Anthony Lehane) Distance: 14 to 20m. Direction: forward. Dive skyward: no.
Scripter: ? (seller: Christoph Naumova) Distance: ? Direction: ? Dive skyward: ?
https://www.xstreetsl.com/modules.php?name=Marketplace&file=item&ItemID=1833427 Scritper: Xah Toll Seller: Xah Toll Distance: ≈11 m. Direction: forward, sideways, backward. Dive skyward: yes.
Freebie used to be at New Jessie in early 2009. The first one at new jessie that shows a Shield with snake.
Scritper: Ducky Chesnokov Distance: ≈11 m. Direction: forward, sideways, backward. Dive skyward: No.
Freebie used to be at New Jessie, in mid 2009. The second one at new jessie, the one comes with kill report.
Scritper: Aeron Kohime Distance: ≈11 m. Direction: forward, sideways, backward. Dive skyward: No.
Do the test many times. Usually the distance will vary by 1 or 2 meters.
Also, it appears that, for some dive rolls, the distance dived depends on your avatar size or attachments.
There are 2 timings you can test. One is the duration of the time from start of dive roll to end of dive roll. The second is the time delay when the last dive roll ends and the new dive roll can begin.
To test them, be sure you have a watch with the second hand. And again, for any sort of testing, you want to be in a region that's as much empty as possible. Also, you need to do test several times.
Also, depends on how the dive roll is scripted, different ones have different quirks.
Note: dive roll is a movement enhancer. There are probably hundreds of movement enhancers of all different sorts. The functional essence of dive roll is that it moves your avatar in a short distance in short time. Many dasher, tele-dasher, breacher, all do this. What we call a “dive roll” product typically means it also have a animation that makes your avatar simulate the acrobatics movement of a dive roll.