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Degrading performance as a function of free space - X25-M G2

J

jimhsu

Senior member
Over the course of several weeks, I'm observing performance degrade pretty reliably as a function of free space on the drive:

Before clearing space - drive has about 8.8G free

It seems like performance goes downhill pretty fast at about 80% used capacity or so. This is most probably because the drive is working too hard trying to find available blocks.

I've been trying to free up space and so large seq writes to restore performance to something close to "normal"

Runs after removing 20GB of junk and writing large contig. ISO files

Notice the green spikes in "C". That's an increase in queue length most likely due to a backlog of defragmentation / write-combining workload.

So the lesson is basically that while TRIM is not out, don't assume that you can just use the 80GB on the drive with impunity. You pay a significant performance price.

I'd like to see if people have similar experiences w/ the G1.


 
Most likely. I've been moving some game installs (modern games as I mentioned, that typically do large seq reads of textures) onto the storage drive.
 
This is one of the reasons why I ordered the 160GB X-25M G2. I'm going to install everything on it and use it before Windows 7 / TRIM, and I don't want to take a HUGE performance hit in the mean time. A small hit, I can deal with.

Now hopefully I won't get the sudden urge to go buy a bunch of newer games. 🙂 My 150 GB Raptor-X is about 80% full as is.
 
haven't noticed any performance degradation yet (windows 7 using only about ~55% of the 74gigs)

going to try and keep things fairly lite and move this into my macbook down the road after I save up enough for a 160gb (or potentially the extreme edition whenever that may come out)...
 
UPDATE performance seems to be coming back after moving a lot of stuff off the drive and during a dozen copy/delete operations of ISO files with an automated batch file.

http://img35.imageshack.us/img...2b6ebcbdaa4d9df57d.png

Still not entirely there yet (it stalled the first time on the 4K tests), but I'll wait for TRIM. This is mostly benchmark obsession - day to day use of the drive hasn't changed much except for crazy high workloads (typically doing some random intensive activity during a seq write) from 1st day.

BTW This does happens on hard drives too. Though the reasons are completely different...
 
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