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Received: from shell.armlinux.org.uk ([2001:4d48:ad52:3201:5054:ff:fe00:4ec]:42644) by pandora.armlinux.org.uk with esmtpsa (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jbMcd-00083m-VU; Wed, 20 May 2020 12:10:52 +0100 Received: from linux by shell.armlinux.org.uk with local (Exim 4.92) (envelope-from ) id 1jbMcV-0006lw-Ja; Wed, 20 May 2020 12:10:43 +0100 Date: Wed, 20 May 2020 12:10:43 +0100 From: Russell King - ARM Linux admin To: Matteo Croce Subject: Re: [EXT] Re: [PATCH net-next 3/5] net: mvpp2: cls: Use RSS contexts to handle RSS tables Message-ID: <20200520111043.GK1551@shell.armlinux.org.uk> References: <20200423170003.GT25745@shell.armlinux.org.uk> <20200509114518.GB1551@shell.armlinux.org.uk> <20200509195246.GJ1551@shell.armlinux.org.uk> <20200509202050.GK1551@shell.armlinux.org.uk> <20200519095330.GA1551@shell.armlinux.org.uk> <20200519190534.78bb8389@turbo.teknoraver.net> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20200519190534.78bb8389@turbo.teknoraver.net> User-Agent: Mutt/1.10.1 (2018-07-13) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200520_041132_064345_F2A3E76D X-CRM114-Status: GOOD ( 12.66 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Antoine Tenart , netdev , "gregory.clement@bootlin.com" , LKML , Maxime Chevallier , Nadav Haklai , Thomas Petazzoni , "miquel.raynal@bootlin.com" , Stefan Chulski , Marcin Wojtas , "David S . Miller" , Linux ARM Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Tue, May 19, 2020 at 07:05:34PM +0200, Matteo Croce wrote: > On Tue, 19 May 2020 12:05:20 +0200 > Matteo Croce wrote: > > Hi, > > The patch seems to work. I'm generating traffic with random MAC and IP > addresses, to have many flows: > > # tcpdump -tenni eth2 > 9a:a9:b1:3a:b1:6b > 00:51:82:11:22:02, ethertype IPv4 (0x0800), length 60: 10.0.0.4.0 > 192.168.0.4.0: UDP, length 12 > 9e:92:fd:f8:7f:0a > 00:51:82:11:22:02, ethertype IPv4 (0x0800), length 60: 10.0.0.4.0 > 192.168.0.4.0: UDP, length 12 > 66:b7:11:8a:c2:1f > 00:51:82:11:22:02, ethertype IPv4 (0x0800), length 60: 10.0.0.1.0 > 192.168.0.1.0: UDP, length 12 > 7a:ba:58:bd:9a:62 > 00:51:82:11:22:02, ethertype IPv4 (0x0800), length 60: 10.0.0.1.0 > 192.168.0.1.0: UDP, length 12 > 7e:78:a9:97:70:3a > 00:51:82:11:22:02, ethertype IPv4 (0x0800), length 60: 10.0.0.2.0 > 192.168.0.2.0: UDP, length 12 > b2:81:91:34:ce:42 > 00:51:82:11:22:02, ethertype IPv4 (0x0800), length 60: 10.0.0.2.0 > 192.168.0.2.0: UDP, length 12 > 2a:05:52:d0:d9:3f > 00:51:82:11:22:02, ethertype IPv4 (0x0800), length 60: 10.0.0.3.0 > 192.168.0.3.0: UDP, length 12 > ee:ee:47:35:fa:81 > 00:51:82:11:22:02, ethertype IPv4 (0x0800), length 60: 10.0.0.3.0 > 192.168.0.3.0: UDP, length 12 > > This is the default rate, with rxhash off: > > # utraf eth2 > tx: 0 bps 0 pps rx: 397.4 Mbps 827.9 Kpps > tx: 0 bps 0 pps rx: 396.3 Mbps 825.7 Kpps > tx: 0 bps 0 pps rx: 396.6 Mbps 826.3 Kpps > tx: 0 bps 0 pps rx: 396.5 Mbps 826.1 Kpps > > PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND > 9 root 20 0 0 0 0 R 99.7 0.0 7:02.58 ksoftirqd/0 > 15 root 20 0 0 0 0 S 0.0 0.0 0:00.00 ksoftirqd/1 > 20 root 20 0 0 0 0 S 0.0 0.0 2:01.48 ksoftirqd/2 > 25 root 20 0 0 0 0 S 0.0 0.0 0:32.86 ksoftirqd/3 > > and this with rx hashing enabled: > > # ethtool -K eth2 rxhash on > # utraf eth2 > tx: 0 bps 0 pps rx: 456.4 Mbps 950.8 Kpps > tx: 0 bps 0 pps rx: 458.4 Mbps 955.0 Kpps > tx: 0 bps 0 pps rx: 457.6 Mbps 953.3 Kpps > tx: 0 bps 0 pps rx: 462.2 Mbps 962.9 Kpps > > PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND > 20 root 20 0 0 0 0 R 0.7 0.0 2:02.34 ksoftirqd/2 > 25 root 20 0 0 0 0 S 0.3 0.0 0:33.25 ksoftirqd/3 > 9 root 20 0 0 0 0 S 0.0 0.0 7:52.57 ksoftirqd/0 > 15 root 20 0 0 0 0 S 0.0 0.0 0:00.00 ksoftirqd/1 > > > The throughput doesn't increase so much, maybe we hit an HW limit of > the gigabit port. The interesting thing is how the global CPU usage > drops from 25% to 1%. > I can't explain this, it could be due to the reduced contention? Hi Matteo, Can I take that as a Tested-by ? Thanks. -- RMK's Patch system: https://www.armlinux.org.uk/developer/patches/ FTTC for 0.8m (est. 1762m) line in suburbia: sync at 13.1Mbps down 424kbps up _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel