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From: Andrew Lunn <andrew@lunn.ch>
To: Joakim Zhang <qiangqing.zhang@nxp.com>
Cc: davem@davemloft.net, kuba@kernel.org,
	frieder.schrempf@kontron.de, netdev@vger.kernel.org,
	linux-kernel@vger.kernel.org, linux-imx@nxp.com
Subject: Re: [RFC net-next 2/2] net: fec: add ndo_select_queue to fix TX bandwidth fluctuations
Date: Sun, 23 May 2021 16:46:12 +0200	[thread overview]
Message-ID: <YKpqtK7YBVFnqRSw@lunn.ch> (raw)
In-Reply-To: <20210523102019.29440-3-qiangqing.zhang@nxp.com>

On Sun, May 23, 2021 at 06:20:19PM +0800, Joakim Zhang wrote:
> From: Fugang Duan <fugang.duan@nxp.com>
> 
> As we know that AVB is enabled by default, and the ENET IP design is
> queue 0 for best effort, queue 1&2 for AVB Class A&B. Bandwidth of
> queue 1&2 set in driver is 50%, TX bandwidth fluctuated when selecting
> tx queues randomly with FEC_QUIRK_HAS_AVB quirk available.

How is the driver currently scheduling between these queues? Given the
802.1q priorities, i think we want queue 2 with the highest priority
for scheduling. Then queue 0 and lastly queue 1.

    Andrew

  parent reply	other threads:[~2021-05-23 14:46 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-23 10:20 [RFC net-next 0/2] net: fec: " Joakim Zhang
2021-05-23 10:20 ` [RFC net-next 1/2] net: fec: add FEC_QUIRK_HAS_MULTI_QUEUES represents i.MX6SX ENET IP Joakim Zhang
2021-05-23 10:20 ` [RFC net-next 2/2] net: fec: add ndo_select_queue to fix TX bandwidth fluctuations Joakim Zhang
2021-05-23 14:38   ` Andrew Lunn
2021-05-25  9:44     ` Joakim Zhang
2021-05-23 14:46   ` Andrew Lunn [this message]
2021-05-25  9:46     ` Joakim Zhang
2021-05-25 13:58       ` Andrew Lunn
2021-05-26  2:06         ` Joakim Zhang

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