SSD free space & Intel SRT

[MauiHawk]

I recently bought a 64GB SSD to use as an SRT cache drive (enhanced mode). Though I don't think in a cache drive scenario write amplification is as big of a deal since SRT enhanced mode doesn't really help write speeds in the first place, I have read in some circumstances SRT can actually lower write performance if the SSD writes are too slow. Therefore I would like to make sure some space is being kept free on the SSD to make sure this doesn't become an issue.

But I suspect the SRT algorithm may keep some free space available on its own, even if you allow it to use the whole drive. I don't want to limit SRT to only 80% of the drive if it's only going to use 80% of what I give it anyway. But I can't seem to find any info on whether SRT will maintain any free space on its own, and if so, how much.

Does anybody know?

 

[postmortemIA]

how are slow writes connected with low free space? AFAIK SSDs have pretty much constant random or sequential write speed across the whole drive, regardless of how much space is left.
Slow writes were problem with earlier intel drives, where sequential write speed was slower than of the hard drives.

 

[MauiHawk]

http://www.anandtech.com/show/6489/playing-with-op