On 25/07/2019 16:12, Jose Abreu wrote: > From: Jon Hunter <jonathanh@xxxxxxxxxx> > Date: Jul/25/2019, 15:25:59 (UTC+00:00) > >> >> On 25/07/2019 14:26, Jose Abreu wrote: >> >> ... >> >>> Well, I wasn't expecting that :/ >>> >>> Per documentation of barriers I think we should set descriptor fields >>> and then barrier and finally ownership to HW so that remaining fields >>> are coherent before owner is set. >>> >>> Anyway, can you also add a dma_rmb() after the call to >>> stmmac_rx_status() ? >> >> Yes. I removed the debug print added the barrier, but that did not help. > > So, I was finally able to setup NFS using your replicated setup and I > can't see the issue :( > > The only difference I have from yours is that I'm using TCP in NFS > whilst you (I believe from the logs), use UDP. So I tried TCP by setting the kernel boot params to 'nfsvers=3' and 'proto=tcp' and this does appear to be more stable, but not 100% stable. It still appears to fail in the same place about 50% of the time. > You do have flow control active right ? And your HW FIFO size is >= 4k ? How can I verify if flow control is active? The documentation for this device indicates a max transfer size of 16kB for TX and RX. Cheers Jon -- nvpublic
