PostgreSQL pain points

"I'd guess this is also similar to stalls seen when writing to a slow USB device (those eventually turn into forced syncs because of dirty limits induced forced writeback and case similar starvation). But I don't know if those code paths are similar enough in that fixing one will also directly benefit the other."

I've seen people suggest this might be solved by the Multi-Queue Block layer (blk-mq) as merged in 3.13, does anyone know if this is true ?