Ted Unangst [t...@tedunangst.com] wrote: > On Wed, Jan 11, 2012, Chris Cappuccio wrote: > > > There's also an issue with dirty buffers getting eaten up, but that is > > prominent on slow devices, and you'd be WAITing in buf_needva in that case. > > I don't think needva has been totally ruled out from what I've seen, > though it's less likely. My other guess is that the raid card itself > prioritizes writes over reads leading to a backlog of read requests.
But the behavior changes with each kernel he tests. It sounds like 4.6 and 4.8 are quite acceptable, the rest are not ?
