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Re: Updated TRIM patches and a graph

From: Tim Bisson <bissont@xxxxxxx>
Date: Thu, 06 Oct 2011 12:11:22 -0700

On 10/6/11 1:41 AM, Samuel J. Greear wrote:
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:

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

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):



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


Hi Sam,

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


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