Optimizing Put Performance in Berkeley DB

Question

I just started playing with Berkeley DB a few days ago so I'm trying to see if there's something I've been missing when it comes to storing data as fast as possible.

Here's some info about the data: - it comes in 512 byte chunks - chunks come in order - chunks will be deleted in FIFO order - if i lose some data off the end because of power failure that's ok as long as the whole db isn't broken

After reading the a bunch of the documentation it seemed like a Queue db was exactly what I wanted.

However, after trying some test code my fastest results were about 1MByte per second just looping through a DB->put with DB_APPEND set. I also tried using transactions and bulk puts but both of these slowed things down considerably so I didn't pursue them for much time. I was inserting into a fresh db created on a NANDFlash chip on my Freescale i.MX35 dev board.

Since we're looking to get at least 2MBytes per second write speeds, I was wondering if there's something I missed that can improve my speeds since I know that my hardware can write faster than this.