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From: "Clément Léger" <clement.leger@bootlin.com>
To: Vladimir Oltean <vladimir.oltean@nxp.com>
Cc: "David S. Miller" <davem@davemloft.net>,
	Jakub Kicinski <kuba@kernel.org>,
	Rob Herring <robh+dt@kernel.org>,
	Claudiu Manoil <claudiu.manoil@nxp.com>,
	Alexandre Belloni <alexandre.belloni@bootlin.com>,
	"UNGLinuxDriver@microchip.com" <UNGLinuxDriver@microchip.com>,
	Andrew Lunn <andrew@lunn.ch>,
	"netdev@vger.kernel.org" <netdev@vger.kernel.org>,
	"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Subject: Re: [PATCH v2 3/6] net: ocelot: pre-compute injection frame header content
Date: Mon, 15 Nov 2021 11:58:05 +0100	[thread overview]
Message-ID: <20211115115805.434e71a8@fixe.home> (raw)
In-Reply-To: <20211115105144.le3a62a2wbkgp632@skbuf>

Le Mon, 15 Nov 2021 10:51:45 +0000,
Vladimir Oltean <vladimir.oltean@nxp.com> a écrit :

> > I checked again my bandwith numbers (obtained with iperf3) with and
> > without the pre-computed header:
> > 
> > Test on standard packets with UDP (iperf3 -t 100 -l 1460 -u -b 0 -c *)
> > - With pre-computed header: UDP TX: 	33Mbit/s
> > - Without UDP TX: 			31Mbit/s  
> > -> 6.5% improvement  
> > 
> > Test on small packets with UDP (iperf3 -t 100 -l 700 -u -b 0 -c *)
> > - With pre-computed header: UDP TX: 	15.8Mbit/s
> > - Without UDP TX: 			16.4Mbit/s  
> > -> 4.3% improvement  
> > 
> > The improvement might not be huge but also not negligible at all.
> > Please tell me if you want me to drop it or not based on those numbers.  
> 
> Is this with manual injection or with FDMA? Do you have before/after
> numbers with FDMA as well? At 31 vs 33 Mbps, this isn't going to compete
> for any races anyway :)

These numbers were for the FDMA, with the CPU, its even much lower
because more time is spent to push bytes through registers...
But agreed with that, this isn't going to beat any records !


-- 
Clément Léger,
Embedded Linux and Kernel engineer at Bootlin
https://bootlin.com

  reply	other threads:[~2021-11-15 11:07 UTC|newest]

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-11-03  9:19 [PATCH v2 0/6] Add FDMA support on ocelot switch driver Clément Léger
2021-11-03  9:19 ` [PATCH v2 1/6] net: ocelot: add support to get port mac from device-tree Clément Léger
2021-11-03 10:26   ` Vladimir Oltean
2021-11-15 11:19   ` Julian Wiedmann
2021-11-15 11:24     ` Clément Léger
2021-11-03  9:19 ` [PATCH v2 2/6] dt-bindings: net: convert mscc,vsc7514-switch bindings to yaml Clément Léger
2021-11-03 10:45   ` Vladimir Oltean
2021-11-08 11:13     ` Clément Léger
2021-11-12 20:06   ` Rob Herring
2021-11-03  9:19 ` [PATCH v2 3/6] net: ocelot: pre-compute injection frame header content Clément Léger
2021-11-03 12:38   ` Vladimir Oltean
2021-11-03 13:53     ` Clément Léger
2021-11-15 10:13       ` Clément Léger
2021-11-15 10:51         ` Vladimir Oltean
2021-11-15 10:58           ` Clément Léger [this message]
2021-11-15 14:08         ` Jakub Kicinski
2021-11-15 14:06           ` Clément Léger
2021-11-15 14:31             ` Vladimir Oltean
2021-11-15 16:03               ` Clément Léger
2021-11-03  9:19 ` [PATCH v2 4/6] net: ocelot: add support for ndo_change_mtu Clément Léger
2021-11-03 12:40   ` Vladimir Oltean
2021-11-03 13:07     ` Clément Léger
2021-11-03  9:19 ` [PATCH v2 5/6] net: ocelot: add FDMA support Clément Léger
2021-11-03 11:25   ` Denis Kirjanov
2021-11-03 12:31   ` Vladimir Oltean
2021-11-03 14:22     ` Clément Léger
2021-11-03  9:19 ` [PATCH v2 6/6] net: ocelot: add jumbo frame support for FDMA Clément Léger
2021-11-03 12:43   ` Vladimir Oltean
2021-11-03 14:30     ` Clément Léger
2021-11-03 10:46 ` [PATCH v2 0/6] Add FDMA support on ocelot switch driver Denis Kirjanov

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