On Fri, Jan 09, 2026 at 03:13:28PM -0500, Frank Li wrote: > This use PCS-CCS-CB-TCB Producer-Consumer Synchronization module, which > support append new DMA request during dmaengine runnings. > > Append new request during dmaengine runnings. > > But look like hardware have bug, which missed doorbell when engine is > running. So add workaround to push doorbelll again when found engine stop. > > Get more than 10% performance gain. > > The before > Rnd read, 4KB, QD=32, 4 jobs: IOPS=33.4k, BW=130MiB/s (137MB/s) > > After > Rnd read, 4KB, QD=32, 4 jobs: IOPS=38.8k, BW=151MiB/s (159MB/s) > > Signed-off-by: Frank Li <[email protected]> > ---
Hello Frank, First of all, I hope that your: [PATCH v3 0/9] dmaengine: Add new API to combine configuration and descriptor preparation series will make it to the upcoming 6.20/7.0 merge window. This RFT series however breaks pci-epf-test: Before: # RUN pci_ep_data_transfer.dma.READ_TEST ... # OK pci_ep_data_transfer.dma.READ_TEST ok 14 pci_ep_data_transfer.dma.READ_TEST # RUN pci_ep_data_transfer.dma.WRITE_TEST ... # OK pci_ep_data_transfer.dma.WRITE_TEST ok 15 pci_ep_data_transfer.dma.WRITE_TEST After: # RUN pci_ep_data_transfer.dma.READ_TEST ... # READ_TEST: Test terminated by timeout # FAIL pci_ep_data_transfer.dma.READ_TEST not ok 14 pci_ep_data_transfer.dma.READ_TEST # RUN pci_ep_data_transfer.dma.WRITE_TEST ... # WRITE_TEST: Test terminated by timeout # FAIL pci_ep_data_transfer.dma.WRITE_TEST not ok 15 pci_ep_data_transfer.dma.WRITE_TEST After a bisect, first bad commit: commit 352fd8d5ed468ea616eb4974b5ac19203528b207 Author: Frank Li <[email protected]> Date: Fri Jan 9 15:13:28 2026 -0500 dmaengine: dw-edma: Dynamitc append new request during dmaengine running Kind regards, Niklas
