On Jan 07, 2015 at 01:47:53PM -0600, Les Mikesell wrote: > > I see a bunch of entries like: > ioatdma 0000:00:08.0: Channel halted, chanerr = 2 > ioatdma 0000:00:08.0: Channel halted, chanerr = 0 > in the logs and one of these: > hrtimer: interrupt took 258633 ns > > Not sure what those mean. We do have considerably more systems > running windows than linux on this hardware and I don't think anyone > has noticed a systemic problem there. Was this resolved? The ioatdma messages are from ioat_dma.c, a driver for Intel's I/OAT DMA engine typically used on high-end server hardware to accelerate network I/O. chanerr = 2 might be an issue with the DMA channel being in a suspended state when the driver isn't expecting it to be. Maybe a network driver bug.