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DragonFly kernel List (threaded) for 2011-10
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Re: Updated TRIM patches and a graph

From: "Samuel J. Greear" <sjg@xxxxxxxxxxxx>
Date: Thu, 6 Oct 2011 02:41:02 -0600

On Sat, Aug 20, 2011 at 4:34 PM, Tim Bisson <bissont@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


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


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