On 21/08/18 05:18 PM, Eric Pilmore wrote: > We have been running locally with Kit's change for dma_map_resource and its > incorporation in ntb_async_tx_submit for the destination address and > it runs fine > under "load" (iperf) on a Xeon (Xeon(R) CPU E5-2680 v4 @ 2.40GHz) based system, > regardless of whether the DMA engine being used is IOAT or a PLX > device sitting in > the PCIe tree. However, when we go back to a i7 (i7-7700K CPU @ 4.20GHz) based > system it seems to run into issues, specifically when put under a > load. In this case, > just having a load using a single ping command with an interval=0, i.e. no delay > between ping packets, after a few thousand packets the system just hangs. No > panic or watchdogs. Note that in this scenario I can only use a PLX DMA engine. This is just my best guess: but it sounds to me like a bug in the PLX DMA driver or hardware. Logan
