From: Simon Horman <horms+rene...@verge.net.au> Date: Thu, 7 Mar 2019 11:24:47 +0100
> From: Masaru Nagai <masaru.nagai...@renesas.com> > > Hardware has the CBS (Credit Based Shaper) which affects only Q3 > and Q2. When updating the CBS settings, even if the driver does so > after waiting for Tx DMA finished, there is a possibility that frame > data still remains in TxFIFO. > > To avoid this, decrease TxFIFO depth of Q3 and Q2 to one. > > This patch has been exercised this using netperf TCP_MAERTS, TCP_STREAM > and UDP_STREAM tests run on an Ebisu board. No performance change was > detected, outside of noise in the tests, both in terms of throughput and > CPU utilisation. > > Fixes: c156633f1353 ("Renesas Ethernet AVB driver proper") > Signed-off-by: Masaru Nagai <masaru.nagai...@renesas.com> > Signed-off-by: Kazuya Mizuguchi <kazuya.mizuguchi...@renesas.com> > [simon: updated changelog] > Signed-off-by: Simon Horman <horms+rene...@verge.net.au> Applied and queued up for -stable, thanks.