linux-kernel - RE: [v2, PATCH 3/4] net: stmmac: modify default value of tx-frames

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Message-ID: <1559615466.24897.106.camel@mhfsdcap03>
Date:   Tue, 4 Jun 2019 10:31:06 +0800
From:   biao huang <biao.huang@...iatek.com>
To:     Jose Abreu <Jose.Abreu@...opsys.com>
CC:     "davem@...emloft.net" <davem@...emloft.net>,
        "andrew@...n.ch" <andrew@...n.ch>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        "Alexandre Torgue" <alexandre.torgue@...com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-stm32@...md-mailman.stormreply.com" 
        <linux-stm32@...md-mailman.stormreply.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mediatek@...ts.infradead.org" 
        <linux-mediatek@...ts.infradead.org>,
        "yt.shen@...iatek.com" <yt.shen@...iatek.com>,
        "jianguo.zhang@...iatek.com" <jianguo.zhang@...iatek.com>,
        "boon.leong.ong@...el.com" <boon.leong.ong@...el.com>
Subject: RE: [v2, PATCH 3/4] net: stmmac: modify default value of tx-frames

On Mon, 2019-06-03 at 11:40 +0000, Jose Abreu wrote:
> From: Biao Huang <biao.huang@...iatek.com>
> 
> > the default value of tx-frames is 25, it's too late when
> > passing tstamp to stack, then the ptp4l will fail:
> > 
> > ptp4l -i eth0 -f gPTP.cfg -m
> > ptp4l: selected /dev/ptp0 as PTP clock
> > ptp4l: port 1: INITIALIZING to LISTENING on INITIALIZE
> > ptp4l: port 0: INITIALIZING to LISTENING on INITIALIZE
> > ptp4l: port 1: link up
> > ptp4l: timed out while polling for tx timestamp
> > ptp4l: increasing tx_timestamp_timeout may correct this issue,
> >        but it is likely caused by a driver bug
> > ptp4l: port 1: send peer delay response failed
> > ptp4l: port 1: LISTENING to FAULTY on FAULT_DETECTED (FT_UNSPECIFIED)
> > 
> > ptp4l tests pass when changing the tx-frames from 25 to 1 with
> > ethtool -C option.
> > It should be fine to set tx-frames default value to 1, so ptp4l will pass
> > by default.
> 
> I'm not sure if this is the right approach ... What's the timeout value 
> you have for TX Timestamp ?
I use the default tx_timestamp_timeout value 1, which represents 1ms.
do you try ptp4l on your side?

performance test is done in https://lkml.org/lkml/2019/5/30/1617
and seems no performance degradation.

> 
> Thanks,
> Jose Miguel Abreu