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Date:   Tue, 16 Apr 2019 13:03:37 +0300
From:   "Leonidas P. Papadakos" <papadakospan@gmail.com>
Subject: RE: [PATCH 1/2] stmmac: introduce flag to dynamically disable TX
 offload for rockchip devices
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txpbl <0x4> (without the no-pbl-x8 option) is the last value where I 
can change the MTU without a timeout.
I've also tried <0x20> with and without no-pbl-x8 but in that area MTU 
is a hot potato.

Seems pretty good though, I'll keep poking to see if it's stable.
currently at txbpl <0x4> by iself I get tx max 934 average 916 Mbps

IT does fluctuate at times but mostly there.