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From:   Jon Hunter <jonathanh@nvidia.com>
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On 25/07/2019 16:12, Jose Abreu wrote:
> From: Jon Hunter <jonathanh@nvidia.com>
> 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