netdev - Re: Choose a default DSA CPU port

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Message-ID: <20230224181326.5lbph42bs566t2ci@skbuf>
Date:   Fri, 24 Feb 2023 20:13:26 +0200
From:   Vladimir Oltean <olteanv@...il.com>
To:     Frank Wunderlich <frank-w@...lic-files.de>
Cc:     Arınç ÜNAL <arinc.unal@...nc9.com>,
        netdev <netdev@...r.kernel.org>, erkin.bozoglu@...ont.com,
        Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Felix Fietkau <nbd@....name>, John Crispin <john@...ozen.org>,
        Mark Lee <Mark-MC.Lee@...iatek.com>,
        Lorenzo Bianconi <lorenzo@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Landen Chao <Landen.Chao@...iatek.com>,
        Sean Wang <sean.wang@...iatek.com>,
        DENG Qingfang <dqfext@...il.com>
Subject: Re: Choose a default DSA CPU port

On Fri, Feb 24, 2023 at 07:07:23PM +0100, Frank Wunderlich wrote:
> root@...-r2:~# ethtool -S eth0 | grep -v ': 0'
> NIC statistics:
>      tx_bytes: 1643364546
>      tx_packets: 1121377
>      rx_bytes: 1270088499
>      rx_packets: 1338400
>      p06_TxUnicast: 1338274
>      p06_TxMulticast: 120
>      p06_TxBroadcast: 6
>      p06_TxPktSz65To127: 525948
>      p06_TxPktSz128To255: 5
>      p06_TxPktSz256To511: 16
>      p06_TxPktSz512To1023: 4
>      p06_Tx1024ToMax: 812427
>      p06_TxBytes: 1275442099
>      p06_RxFiltering: 16
>      p06_RxUnicast: 1121339
>      p06_RxMulticast: 37
>      p06_RxBroadcast: 1
>      p06_RxPktSz64: 3
>      p06_RxPktSz65To127: 43757
>      p06_RxPktSz128To255: 3
>      p06_RxPktSz256To511: 3
>      p06_RxPktSz1024ToMax: 1077611
>      p06_RxBytes: 1643364546

Looking at the drivers, I see pause frames aren't counted in ethtool -S,
so we wouldn't know this. However the slowdown *is* lossless, so the
hypothesis is still not disproved.

Could you please test after removing the "pause" property from the
switch's port@6 device tree node?