Updated TRIM patches and a graph

[Tim Bisson]

On 10/6/11 1:41 AM, Samuel J. Greear wrote:
On Sat, Aug 20, 2011 at 4:34 PM, Tim Bisson<bissont at mac.com>  wrote:
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


Tim,

Is this "whole_thing.diff" ready to commit in your opinion?

Best,
Sam
Hi Sam,

Yes, I would say it's ready to commit. And all TRIM functionality is off 
by default.

Tim