Updated TRIM patches and a graph

[Tim Bisson]

Hi All,

I've updated the TRIM patches to include Sam Greear's comments. Thanks Sam.

The updated code and graph below can be found here:
http://www.box.net/shared/0os5q17q12f68p7k9r89
I also created a graph showing the effect of "random small writes" on 
sequential read performance on an SSD. What I did was TRIM the device, 
then dirty the device for X minutes, then sequentially read through the 
entire device. The graph shows the average read throughput of reading 
the entire device.

This implies that if you end up doing a lot of small-write updates and 
sequential reads, you should use TRIM...

I'm trying to get numbers while using online UFS trim, but I'm still 
trying to debug the "fsstress & UFS" bug (appears on master w/out TRIM too):
http://bugs.dragonflybsd.org/issue2102

Thanks,
Tim