I asked one of our kernel guys. Here's his response:

"We are indeed looking at Codel. We were actually working on backporting BQL+Codel to the 2.6.x kernel but the Google guys finally got the network stack under control enough for us to deploy >3.3. The 16MB of buffers hasn't hurt us much yet, and may in the long run save us from switches that have too shallow a buffer for the high contention ratios we run on the switch." -LinuXY