Linux-Next Archive on lore.kernel.org
 help / color / Atom feed
From: Lucas Stach <l.stach@pengutronix.de>
To: Oleksandr Suvorov <oleksandr.suvorov@toradex.com>,
	"linux-next@vger.kernel.org" <linux-next@vger.kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>,
	"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
	Marcel Ziswiler <marcel.ziswiler@toradex.com>,
	Shawn Guo <shawnguo@kernel.org>,
	Sascha Hauer <s.hauer@pengutronix.de>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	Igor Opanyuk <igor.opanyuk@toradex.com>,
	Rob Herring <robh+dt@kernel.org>,
	NXP Linux Team <linux-imx@nxp.com>,
	Pengutronix Kernel Team <kernel@pengutronix.de>,
	Fabio Estevam <festevam@gmail.com>,
	"linux-arm-kernel@lists.infradead.org" 
	<linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH] ARM: dts: colibri-imx7: fix ethernet performance
Date: Thu, 16 Jan 2020 12:35:40 +0100
Message-ID: <d3b02f79be206a14d7810c42e08ab9e224f40ae2.camel@pengutronix.de> (raw)
In-Reply-To: <20200116101313.2524795-1-oleksandr.suvorov@toradex.com>

On Do, 2020-01-16 at 10:13 +0000, Oleksandr Suvorov wrote:
> Performance test of ethernet interface shows extremely low result:
> 
> === w/o fix =================
> Connecting to host 192.168.x.x, port 5201
> [  5] local 192.168.x.y port59020 connected to 192.168.x.x port 5201
> ...
> [ ID] Interval           Transfer     Bitrate         Retr
> [  5]   0.00-10.00  sec  2.78 MBytes  2.33 Mbits/sec  337      sender
> [  5]   0.00-10.00  sec  2.66 MBytes  2.23
> Mbits/sec           receiver
> =============================
> 
> Adding correct settings of the mdio bus with the respective phy
> fixes this issue.

So what's the actual issue being fixed here? High packet loss due to
trying to force GBit speeds through 100MBit magnetics? So the addition
of "max-speed = <100>;" is the real core of the fix?

The commit log should mention this.

Regards,
Lucas

> 
> === after fix ===============
> iperf3 -c 192.168.x.x
> Connecting to host 192.168.x.x, port 5201
> [  5] local 192.168.x.y port 50702 connected to 192.168.x.x port 5201
> ...
> [ ID] Interval           Transfer     Bitrate         Retr
> [  5]   0.00-10.00  sec   114 MBytes  95.4 Mbits/sec   56      sender
> [  5]   0.00-10.00  sec   112 MBytes  94.1
> Mbits/sec           receiver
> =============================
> 
> Fixed: commit b326629f25b7 ("ARM: dts: imx7: add Toradex Colibri
>                     iMX7S/iMX7D support")
> Signed-off-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
> Signed-off-by: Oleksandr Suvorov <oleksandr.suvorov@toradex.com>
> 
> ---
> 
>  arch/arm/boot/dts/imx7-colibri.dtsi | 13 +++++++++++++
>  1 file changed, 13 insertions(+)
> 
> diff --git a/arch/arm/boot/dts/imx7-colibri.dtsi
> b/arch/arm/boot/dts/imx7-colibri.dtsi
> index d05be3f0e2a7..7b6a7c124345 100644
> --- a/arch/arm/boot/dts/imx7-colibri.dtsi
> +++ b/arch/arm/boot/dts/imx7-colibri.dtsi
> @@ -115,7 +115,20 @@ &fec1 {
>  	assigned-clock-rates = <0>, <100000000>;
>  	phy-mode = "rmii";
>  	phy-supply = <&reg_LDO1>;
> +	phy-handle = <&ethphy0>;
>  	fsl,magic-packet;
> +
> +	mdio {
> +		#address-cells = <1>;
> +		#size-cells = <0>;
> +
> +		ethphy0: ethernet-phy@0 {
> +			compatible = "ethernet-phy-ieee802.3-c22";
> +			max-speed = <100>;
> +			micrel,led-mode = <0>;
> +			reg = <0>;
> +		};
> +	};
>  };
>  
>  &flexcan1 {


  reply index

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-16 10:13 Oleksandr Suvorov
2020-01-16 11:35 ` Lucas Stach [this message]
2020-01-17 19:25   ` Oleksandr Suvorov

Reply instructions:

You may reply publically to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=d3b02f79be206a14d7810c42e08ab9e224f40ae2.camel@pengutronix.de \
    --to=l.stach@pengutronix.de \
    --cc=devicetree@vger.kernel.org \
    --cc=festevam@gmail.com \
    --cc=igor.opanyuk@toradex.com \
    --cc=kernel@pengutronix.de \
    --cc=linux-arm-kernel@lists.infradead.org \
    --cc=linux-imx@nxp.com \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-next@vger.kernel.org \
    --cc=marcel.ziswiler@toradex.com \
    --cc=mark.rutland@arm.com \
    --cc=oleksandr.suvorov@toradex.com \
    --cc=robh+dt@kernel.org \
    --cc=s.hauer@pengutronix.de \
    --cc=shawnguo@kernel.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

Linux-Next Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/linux-next/0 linux-next/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 linux-next linux-next/ https://lore.kernel.org/linux-next \
		linux-next@vger.kernel.org
	public-inbox-index linux-next

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.linux-next


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git