RE: [EXT] Re: [PATCH v2 RFC net-next 08/18] net: mvpp2: add FCA periodic timer configurations

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On Sun, Jan 24, 2021 at 01:43:57PM +0200, stefanc@marvell.com wrote:

quoted

+/* Set Flow Control timer x140 faster than pause quanta to ensure
+that link
+ * partner won't send taffic if port in XOFF mode.

Can you explain more why 140 times faster is desirable here? Why 140 times
and not, say, 10 times faster? Where does this figure come from, and what is
the reasoning? Is there a switch that requires it?

I tested with 140.
Actually regarding to spec each quanta should be equal to 512 bit times.
In 10G bit time is 0.1ns.
So It actually should be:
FC_CLK_DIVIDER = 10000 / 512 = ~20. I took some buffer and made it 140.
So maybe I can do it 100?

Regards,
Stefan.