MT7621 Flow Control

Andre Valentin avalentin at
Thu Aug 6 08:31:00 EDT 2020

Hi Jaap,

Am 06.08.20 um 13:43 schrieb Jaap Buurman:
> Dear all,
> I have noticed the flow control work for mt7621 in the following
> Openwrt patch:;a=commit;h=c8f8e59816eca49d776562d2d302bf990a87faf0
> However, the problem that the patch is supposed to fix is still
> occurring, even in combination with other experimental patches
> submitted. These experiences can be read about here:
> However, on this mailing list a user by the name of Kristian claims
> that disabling flow control helps fix this problem, as can be read
> here:
> From what I understood, he was running many mt7621 devices
> commercially, with many of them experiencing the issue, which were all
> fixed with his own flow control patch. My question is why the decision
> was made to only disable flow control on port 5 in the above mentioned
> Openwrt patch? AFAIK, Kristian's own patch disables flow control on
> all of the ports and he claims the issue is fixed for him. Perhaps the
> current patch should be extended to disable flow control on all ports?
> What are people's thoughts on this?

I'm facing the same issue now after upgrading to 5.4 kernel more often than before.
Every second reboot reboot with 5.4 fails with this timeout error.

> Yours sincerely,
> Jaap


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