> Strange, I've always thought I'm limited by the disk performance...
> Althought my tests seemed to be curbed at a certain level

Try eCryptfs on tmpfs to test the theory. I see very similar numbers to
eCryptfs on ext4 on an SSD.

> I hoped it was just a bug, not a limitation.

That's what I was getting at in comment #5, I think we're doing an
extra page encrypt and writing to the lower file system on every
buffered write. It ensures some cache consistency between the eCryptfs
page cache and the lower page cache, but I'm not sure if that is
actually helpful in the case of eCryptfs mounted on a local filesystem.

-- 
writing to ecryptfs partition on SSD drive is many times slower than writing to 
unencrypted partition on the same drive
https://bugs.launchpad.net/bugs/654764
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