On Fri, Jan 23, 2026 at 11:41:54AM +0100, Niklas Cassel wrote: > 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 >
Thanks, let me try to fix it. Frank > > > Kind regards, > Niklas
